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<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context>
us-gaap:OtherRestrictedAssetsNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
14.5
monetaryItemType
table: <entity> 14.5 </entity> <entity type> monetaryItemType </entity type> <context> Total Fair Value of Assets | $ 14.5 | $ 6.0 | — | $ 20.5 </context>
us-gaap:AssetsFairValueDisclosure
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
6.0
monetaryItemType
table: <entity> 6.0 </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Corporate and Governmental Debt Securities | — | $ 6.0 | — | 6.0 </context>
us-gaap:AssetsFairValueDisclosure
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context>
us-gaap:AssetsFairValueDisclosure
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
20.5
monetaryItemType
table: <entity> 20.5 </entity> <entity type> monetaryItemType </entity type> <context> Total Fair Value of Assets | $ 14.5 | $ 6.0 | — | $ 20.5 </context>
us-gaap:AssetsFairValueDisclosure
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context>
us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
16.5
monetaryItemType
table: <entity> 16.5 </entity> <entity type> monetaryItemType </entity type> <context> Deferred Compensation | — | $ 16.5 | — | $ 16.5 </context>
us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context>
us-gaap:LiabilitiesFairValueDisclosure
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Value Measures</td><td>Level 1</td><td></td><td>Level 2</td><td></td><td>Level 3</td><td></td><td>Total</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Assets:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Investments (a) Investments (a)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Available-for-sale – Equity Securities</td><td>$ 8.7</td><td></td><td>—</td><td></td><td>—</td><td></td><td>$ 8.7</td></tr><tr><td>Available-for-sale – Corporate and Governmental Debt Securities</td><td>—</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>6.0</td></tr><tr><td>Cash Equivalents</td><td>5.8</td><td></td><td>—</td><td></td><td>—</td><td></td><td>5.8</td></tr><tr><td>Total Fair Value of Assets</td><td>$ 14.5</td><td></td><td>$ 6.0</td><td></td><td>—</td><td></td><td>$ 20.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Liabilities: (b) Liabilities: (b)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Deferred Compensation</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Total Fair Value of Liabilities</td><td>—</td><td></td><td>$ 16.5</td><td></td><td>—</td><td></td><td>$ 16.5</td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr></table>
table
16.5
monetaryItemType
table: <entity> 16.5 </entity> <entity type> monetaryItemType </entity type> <context> Deferred Compensation | — | $ 16.5 | — | $ 16.5 </context>
us-gaap:LiabilitiesFairValueDisclosure
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Financial Instruments</td><td>Carrying Amount</td><td></td><td>Fair Value</td></tr><tr><td>Millions</td><td></td><td></td><td></td></tr><tr><td>Short-Term and Long-Term Debt (a) Short-Term and Long-Term Debt (a)</td><td></td><td></td><td></td></tr><tr><td>December 31, 2024</td><td>$ 1,808.0</td><td></td><td>$ 1,668.0</td></tr><tr><td>December 31, 2023</td><td>$ 1,799.4</td><td></td><td>$ 1,670.6</td></tr></table>
table
1808.0
monetaryItemType
table: <entity> 1808.0 </entity> <entity type> monetaryItemType </entity type> <context> December 31, 2024 | $ 1,808.0 | $ 1,668.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Financial Instruments</td><td>Carrying Amount</td><td></td><td>Fair Value</td></tr><tr><td>Millions</td><td></td><td></td><td></td></tr><tr><td>Short-Term and Long-Term Debt (a) Short-Term and Long-Term Debt (a)</td><td></td><td></td><td></td></tr><tr><td>December 31, 2024</td><td>$ 1,808.0</td><td></td><td>$ 1,668.0</td></tr><tr><td>December 31, 2023</td><td>$ 1,799.4</td><td></td><td>$ 1,670.6</td></tr></table>
table
1668.0
monetaryItemType
table: <entity> 1668.0 </entity> <entity type> monetaryItemType </entity type> <context> December 31, 2024 | $ 1,808.0 | $ 1,668.0 </context>
us-gaap:LongTermDebtFairValue
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Financial Instruments</td><td>Carrying Amount</td><td></td><td>Fair Value</td></tr><tr><td>Millions</td><td></td><td></td><td></td></tr><tr><td>Short-Term and Long-Term Debt (a) Short-Term and Long-Term Debt (a)</td><td></td><td></td><td></td></tr><tr><td>December 31, 2024</td><td>$ 1,808.0</td><td></td><td>$ 1,668.0</td></tr><tr><td>December 31, 2023</td><td>$ 1,799.4</td><td></td><td>$ 1,670.6</td></tr></table>
table
1799.4
monetaryItemType
table: <entity> 1799.4 </entity> <entity type> monetaryItemType </entity type> <context> December 31, 2023 | $ 1,799.4 | $ 1,670.6 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Financial Instruments</td><td>Carrying Amount</td><td></td><td>Fair Value</td></tr><tr><td>Millions</td><td></td><td></td><td></td></tr><tr><td>Short-Term and Long-Term Debt (a) Short-Term and Long-Term Debt (a)</td><td></td><td></td><td></td></tr><tr><td>December 31, 2024</td><td>$ 1,808.0</td><td></td><td>$ 1,668.0</td></tr><tr><td>December 31, 2023</td><td>$ 1,799.4</td><td></td><td>$ 1,670.6</td></tr></table>
table
1670.6
monetaryItemType
table: <entity> 1670.6 </entity> <entity type> monetaryItemType </entity type> <context> December 31, 2023 | $ 1,799.4 | $ 1,670.6 </context>
us-gaap:LongTermDebtFairValue
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.69
percentItemType
table: <entity> 3.69 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> 3.69 % Series Due 2024 3.69 % Series Due 2024 | — | $ 60.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
60.0
monetaryItemType
table: <entity> 60.0 </entity> <entity type> monetaryItemType </entity type> <context> 3.69 % Series Due 2024 3.69 % Series Due 2024 | — | $ 60.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.90
percentItemType
table: <entity> 4.90 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
30.0
monetaryItemType
table: <entity> 30.0 </entity> <entity type> monetaryItemType </entity type> <context> 4.90 % Series Due 2025 4.90 % Series Due 2025 | $ 30.0 | 30.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.10
percentItemType
table: <entity> 5.10 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.20
percentItemType
table: <entity> 3.20 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
75.0
monetaryItemType
table: <entity> 75.0 </entity> <entity type> monetaryItemType </entity type> <context> 3.20 % Series Due 2026 3.20 % Series Due 2026 | 75.0 | 75.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.99
percentItemType
table: <entity> 5.99 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.30
percentItemType
table: <entity> 3.30 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
40.0
monetaryItemType
table: <entity> 40.0 </entity> <entity type> monetaryItemType </entity type> <context> 3.30 % Series Due 2028 3.30 % Series Due 2028 | 40.0 | 40.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.08
percentItemType
table: <entity> 4.08 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
70.0
monetaryItemType
table: <entity> 70.0 </entity> <entity type> monetaryItemType </entity type> <context> 4.08 % Series Due 2029 4.08 % Series Due 2029 | 70.0 | 70.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.74
percentItemType
table: <entity> 3.74 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
50.0
monetaryItemType
table: <entity> 50.0 </entity> <entity type> monetaryItemType </entity type> <context> 3.74 % Series Due 2029 3.74 % Series Due 2029 | 50.0 | 50.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
2.50
percentItemType
table: <entity> 2.50 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
46.0
monetaryItemType
table: <entity> 46.0 </entity> <entity type> monetaryItemType </entity type> <context> 2.50 % Series Due 2030 2.50 % Series Due 2030 | 46.0 | 46.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.86
percentItemType
table: <entity> 3.86 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
2.79
percentItemType
table: <entity> 2.79 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
100.0
monetaryItemType
table: <entity> 100.0 </entity> <entity type> monetaryItemType </entity type> <context> 2.79 % Series Due 2031 2.79 % Series Due 2031 | 100.0 | 100.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.54
percentItemType
table: <entity> 4.54 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.98
percentItemType
table: <entity> 4.98 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
125.0
monetaryItemType
table: <entity> 125.0 </entity> <entity type> monetaryItemType </entity type> <context> 4.98 % Series Due 2033 4.98 % Series Due 2033 | 125.0 | 125.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.69
percentItemType
table: <entity> 5.69 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.72
percentItemType
table: <entity> 5.72 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
6.00
percentItemType
table: <entity> 6.00 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
35.0
monetaryItemType
table: <entity> 35.0 </entity> <entity type> monetaryItemType </entity type> <context> 6.00 % Series Due 2040 6.00 % Series Due 2040 | 35.0 | 35.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.82
percentItemType
table: <entity> 5.82 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
45.0
monetaryItemType
table: <entity> 45.0 </entity> <entity type> monetaryItemType </entity type> <context> 5.82 % Series Due 2040 5.82 % Series Due 2040 | 45.0 | 45.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
85.0
monetaryItemType
table: <entity> 85.0 </entity> <entity type> monetaryItemType </entity type> <context> 4.08 % Series Due 2042 4.08 % Series Due 2042 | 85.0 | 85.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.21
percentItemType
table: <entity> 4.21 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.95
percentItemType
table: <entity> 4.95 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.05
percentItemType
table: <entity> 5.05 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.39
percentItemType
table: <entity> 4.39 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.07
percentItemType
table: <entity> 4.07 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.47
percentItemType
table: <entity> 4.47 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
94.0
monetaryItemType
table: <entity> 94.0 </entity> <entity type> monetaryItemType </entity type> <context> 3.30 % Series Due 2050 3.30 % Series Due 2050 | 94.0 | 94.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.26
percentItemType
table: <entity> 3.26 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
9.5
monetaryItemType
table: <entity> 9.5 </entity> <entity type> monetaryItemType </entity type> <context> Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024 | — | 9.5 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
27.8
monetaryItemType
table: <entity> 27.8 </entity> <entity type> monetaryItemType </entity type> <context> Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025 | 27.8 | 27.8 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
20.0
monetaryItemType
table: <entity> 20.0 </entity> <entity type> monetaryItemType </entity type> <context> Revolving Credit Facility Variable Rate Due 2027 | 20.0 | — </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
2.65
percentItemType
table: <entity> 2.65 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
150.0
monetaryItemType
table: <entity> 150.0 </entity> <entity type> monetaryItemType </entity type> <context> Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025 | — | 150.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
3.11
percentItemType
table: <entity> 3.11 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
80.0
monetaryItemType
table: <entity> 80.0 </entity> <entity type> monetaryItemType </entity type> <context> Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027 | 80.0 | 80.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
5.94
percentItemType
table: <entity> 5.94 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
6.18
percentItemType
table: <entity> 6.18 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.15
percentItemType
table: <entity> 4.15 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
15.0
monetaryItemType
table: <entity> 15.0 </entity> <entity type> monetaryItemType </entity type> <context> SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028 | 15.0 | 15.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
4.14
percentItemType
table: <entity> 4.14 </entity> <entity type> percentItemType </entity type> <context> None </context>
us-gaap:DebtInstrumentInterestRateStatedPercentage
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
12.0
monetaryItemType
table: <entity> 12.0 </entity> <entity type> monetaryItemType </entity type> <context> SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048 | 12.0 | 12.0 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
53.2
monetaryItemType
table: <entity> 53.2 </entity> <entity type> monetaryItemType </entity type> <context> Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 | 53.2 | 95.1 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
95.1
monetaryItemType
table: <entity> 95.1 </entity> <entity type> monetaryItemType </entity type> <context> Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 | 53.2 | 95.1 </context>
us-gaap:DebtInstrumentCarryingAmount
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
8.6
monetaryItemType
table: <entity> 8.6 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:DeferredFinanceCostsNet
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
8.1
monetaryItemType
table: <entity> 8.1 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:DeferredFinanceCostsNet
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
1799.4
monetaryItemType
table: <entity> 1799.4 </entity> <entity type> monetaryItemType </entity type> <context> Total Long-Term Debt | 1,799.4 | 1,791.3 </context>
us-gaap:LongTermDebt
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
1791.3
monetaryItemType
table: <entity> 1791.3 </entity> <entity type> monetaryItemType </entity type> <context> Total Long-Term Debt | 1,799.4 | 1,791.3 </context>
us-gaap:LongTermDebt
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
94.7
monetaryItemType
table: <entity> 94.7 </entity> <entity type> monetaryItemType </entity type> <context> Less: Due Within One Year | 94.7 | 111.4 </context>
us-gaap:LongTermDebtCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
111.4
monetaryItemType
table: <entity> 111.4 </entity> <entity type> monetaryItemType </entity type> <context> Less: Due Within One Year | 94.7 | 111.4 </context>
us-gaap:LongTermDebtCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
1704.7
monetaryItemType
table: <entity> 1704.7 </entity> <entity type> monetaryItemType </entity type> <context> Net Long-Term Debt | $ 1,704.7 | $ 1,679.9 </context>
us-gaap:LongTermDebtNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Long-Term Debt</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>First Mortgage Bonds</td><td></td><td></td></tr><tr><td>3.69 % Series Due 2024 3.69 % Series Due 2024</td><td>—</td><td>$ 60.0</td></tr><tr><td>4.90 % Series Due 2025 4.90 % Series Due 2025</td><td>$ 30.0</td><td>30.0</td></tr><tr><td>5.10 % Series Due 2025 5.10 % Series Due 2025</td><td>30.0</td><td>30.0</td></tr><tr><td>3.20 % Series Due 2026 3.20 % Series Due 2026</td><td>75.0</td><td>75.0</td></tr><tr><td>5.99 % Series Due 2027 5.99 % Series Due 2027</td><td>60.0</td><td>60.0</td></tr><tr><td>3.30 % Series Due 2028 3.30 % Series Due 2028</td><td>40.0</td><td>40.0</td></tr><tr><td>4.08 % Series Due 2029 4.08 % Series Due 2029</td><td>70.0</td><td>70.0</td></tr><tr><td>3.74 % Series Due 2029 3.74 % Series Due 2029</td><td>50.0</td><td>50.0</td></tr><tr><td>2.50 % Series Due 2030 2.50 % Series Due 2030</td><td>46.0</td><td>46.0</td></tr><tr><td>3.86 % Series Due 2030 3.86 % Series Due 2030</td><td>60.0</td><td>60.0</td></tr><tr><td>2.79 % Series Due 2031 2.79 % Series Due 2031</td><td>100.0</td><td>100.0</td></tr><tr><td>4.54 % Series Due 2032 4.54 % Series Due 2032</td><td>75.0</td><td>75.0</td></tr><tr><td>4.98 % Series Due 2033 4.98 % Series Due 2033</td><td>125.0</td><td>125.0</td></tr><tr><td>5.69 % Series Due 2036 5.69 % Series Due 2036</td><td>50.0</td><td>50.0</td></tr><tr><td>5.72 % Series Due 2039 5.72 % Series Due 2039</td><td>100.0</td><td>—</td></tr><tr><td>6.00 % Series Due 2040 6.00 % Series Due 2040</td><td>35.0</td><td>35.0</td></tr><tr><td>5.82 % Series Due 2040 5.82 % Series Due 2040</td><td>45.0</td><td>45.0</td></tr><tr><td>4.08 % Series Due 2042 4.08 % Series Due 2042</td><td>85.0</td><td>85.0</td></tr><tr><td>4.21 % Series Due 2043 4.21 % Series Due 2043</td><td>60.0</td><td>60.0</td></tr><tr><td>4.95 % Series Due 2044 4.95 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>5.05 % Series Due 2044 5.05 % Series Due 2044</td><td>40.0</td><td>40.0</td></tr><tr><td>4.39 % Series Due 2044 4.39 % Series Due 2044</td><td>50.0</td><td>50.0</td></tr><tr><td>4.07 % Series Due 2048 4.07 % Series Due 2048</td><td>60.0</td><td>60.0</td></tr><tr><td>4.47 % Series Due 2049 4.47 % Series Due 2049</td><td>30.0</td><td>30.0</td></tr><tr><td>3.30 % Series Due 2050 3.30 % Series Due 2050</td><td>94.0</td><td>94.0</td></tr><tr><td>Armenia Mountain Senior Secured Notes 3.26 % Due 2024 Armenia Mountain Senior Secured Notes 3.26 % Due 2024</td><td>—</td><td>9.5</td></tr><tr><td>Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025</td><td>27.8</td><td>27.8</td></tr><tr><td>Revolving Credit Facility Variable Rate Due 2027</td><td>20.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 2.65 % Due 2025 Senior Unsecured Notes 2.65 % Due 2025</td><td>—</td><td>150.0</td></tr><tr><td>Senior Unsecured Notes 3.11 % Due 2027 Senior Unsecured Notes 3.11 % Due 2027</td><td>80.0</td><td>80.0</td></tr><tr><td>Senior Unsecured Notes 5.94 % Due 2029 Senior Unsecured Notes 5.94 % Due 2029</td><td>100.0</td><td>—</td></tr><tr><td>Senior Unsecured Notes 6.18 % Due 2034 Senior Unsecured Notes 6.18 % Due 2034</td><td>50.0</td><td>—</td></tr><tr><td>SWL&P First Mortgage Bonds 4.15 % Series Due 2028 SWL&P First Mortgage Bonds 4.15 % Series Due 2028</td><td>15.0</td><td>15.0</td></tr><tr><td>SWL&P First Mortgage Bonds 4.14 % Series Due 2048 SWL&P First Mortgage Bonds 4.14 % Series Due 2048</td><td>12.0</td><td>12.0</td></tr><tr><td>Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051 Other Long-Term Debt, 2024 Weighted Average Rate 4.47 % Due 2025 – 2051</td><td>53.2</td><td>95.1</td></tr><tr><td>Unamortized Debt Issuance Costs</td><td>( 8.6 )</td><td>( 8.1 )</td></tr><tr><td>Total Long-Term Debt</td><td>1,799.4</td><td>1,791.3</td></tr><tr><td>Less: Due Within One Year</td><td>94.7</td><td>111.4</td></tr><tr><td>Net Long-Term Debt</td><td>$ 1,704.7</td><td>$ 1,679.9</td></tr></table>
table
1679.9
monetaryItemType
table: <entity> 1679.9 </entity> <entity type> monetaryItemType </entity type> <context> Net Long-Term Debt | $ 1,704.7 | $ 1,679.9 </context>
us-gaap:LongTermDebtNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
192.9
monetaryItemType
table: <entity> 192.9 </entity> <entity type> monetaryItemType </entity type> <context> Capital Purchase Obligations | $ 192.9 | $ 37.4 | $ 91.8 | $ 59.8 | $ 5.6 | $ 13.7 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
37.4
monetaryItemType
table: <entity> 37.4 </entity> <entity type> monetaryItemType </entity type> <context> Capital Purchase Obligations | $ 192.9 | $ 37.4 | $ 91.8 | $ 59.8 | $ 5.6 | $ 13.7 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
91.8
monetaryItemType
table: <entity> 91.8 </entity> <entity type> monetaryItemType </entity type> <context> Capital Purchase Obligations | $ 192.9 | $ 37.4 | $ 91.8 | $ 59.8 | $ 5.6 | $ 13.7 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
59.8
monetaryItemType
table: <entity> 59.8 </entity> <entity type> monetaryItemType </entity type> <context> Capital Purchase Obligations | $ 192.9 | $ 37.4 | $ 91.8 | $ 59.8 | $ 5.6 | $ 13.7 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
5.6
monetaryItemType
table: <entity> 5.6 </entity> <entity type> monetaryItemType </entity type> <context> Capital Purchase Obligations | $ 192.9 | $ 37.4 | $ 91.8 | $ 59.8 | $ 5.6 | $ 13.7 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
13.7
monetaryItemType
table: <entity> 13.7 </entity> <entity type> monetaryItemType </entity type> <context> Capital Purchase Obligations | $ 192.9 | $ 37.4 | $ 91.8 | $ 59.8 | $ 5.6 | $ 13.7 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
27.2
monetaryItemType
table: <entity> 27.2 </entity> <entity type> monetaryItemType </entity type> <context> Easements (a) Easements (a) | $ 27.2 | $ 8.3 | $ 8.4 | $ 8.5 | $ 8.5 | $ 212.0 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
8.3
monetaryItemType
table: <entity> 8.3 </entity> <entity type> monetaryItemType </entity type> <context> Easements (a) Easements (a) | $ 27.2 | $ 8.3 | $ 8.4 | $ 8.5 | $ 8.5 | $ 212.0 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
8.4
monetaryItemType
table: <entity> 8.4 </entity> <entity type> monetaryItemType </entity type> <context> Easements (a) Easements (a) | $ 27.2 | $ 8.3 | $ 8.4 | $ 8.5 | $ 8.5 | $ 212.0 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
8.5
monetaryItemType
table: <entity> 8.5 </entity> <entity type> monetaryItemType </entity type> <context> Easements (a) Easements (a) | $ 27.2 | $ 8.3 | $ 8.4 | $ 8.5 | $ 8.5 | $ 212.0 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
8.5
monetaryItemType
table: <entity> 8.5 </entity> <entity type> monetaryItemType </entity type> <context> Easements (a) Easements (a) | $ 27.2 | $ 8.3 | $ 8.4 | $ 8.5 | $ 8.5 | $ 212.0 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
212.0
monetaryItemType
table: <entity> 212.0 </entity> <entity type> monetaryItemType </entity type> <context> Easements (a) Easements (a) | $ 27.2 | $ 8.3 | $ 8.4 | $ 8.5 | $ 8.5 | $ 212.0 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
134.6
monetaryItemType
table: <entity> 134.6 </entity> <entity type> monetaryItemType </entity type> <context> PPAs (b) PPAs (b) | $ 134.6 | $ 136.0 | $ 130.1 | $ 133.3 | $ 134.1 | $ 797.3 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
136.0
monetaryItemType
table: <entity> 136.0 </entity> <entity type> monetaryItemType </entity type> <context> PPAs (b) PPAs (b) | $ 134.6 | $ 136.0 | $ 130.1 | $ 133.3 | $ 134.1 | $ 797.3 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
130.1
monetaryItemType
table: <entity> 130.1 </entity> <entity type> monetaryItemType </entity type> <context> PPAs (b) PPAs (b) | $ 134.6 | $ 136.0 | $ 130.1 | $ 133.3 | $ 134.1 | $ 797.3 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
133.3
monetaryItemType
table: <entity> 133.3 </entity> <entity type> monetaryItemType </entity type> <context> PPAs (b) PPAs (b) | $ 134.6 | $ 136.0 | $ 130.1 | $ 133.3 | $ 134.1 | $ 797.3 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
134.1
monetaryItemType
table: <entity> 134.1 </entity> <entity type> monetaryItemType </entity type> <context> PPAs (b) PPAs (b) | $ 134.6 | $ 136.0 | $ 130.1 | $ 133.3 | $ 134.1 | $ 797.3 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
797.3
monetaryItemType
table: <entity> 797.3 </entity> <entity type> monetaryItemType </entity type> <context> PPAs (b) PPAs (b) | $ 134.6 | $ 136.0 | $ 130.1 | $ 133.3 | $ 134.1 | $ 797.3 </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
31.8
monetaryItemType
table: <entity> 31.8 </entity> <entity type> monetaryItemType </entity type> <context> Other Purchase Obligations (c) Other Purchase Obligations (c) | $ 31.8 | $ 9.6 | $ 10.3 | — | — | — </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
9.6
monetaryItemType
table: <entity> 9.6 </entity> <entity type> monetaryItemType </entity type> <context> Other Purchase Obligations (c) Other Purchase Obligations (c) | $ 31.8 | $ 9.6 | $ 10.3 | — | — | — </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
10.3
monetaryItemType
table: <entity> 10.3 </entity> <entity type> monetaryItemType </entity type> <context> Other Purchase Obligations (c) Other Purchase Obligations (c) | $ 31.8 | $ 9.6 | $ 10.3 | — | — | — </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Other Purchase Obligations (c) Other Purchase Obligations (c) | $ 31.8 | $ 9.6 | $ 10.3 | — | — | — </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Other Purchase Obligations (c) Other Purchase Obligations (c) | $ 31.8 | $ 9.6 | $ 10.3 | — | — | — </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>2025</td><td>2026</td><td>2027</td><td>2028</td><td>2029</td><td>Thereafter</td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Capital Purchase Obligations</td><td>$ 192.9</td><td></td><td>$ 37.4</td><td></td><td>$ 91.8</td><td></td><td>$ 59.8</td><td></td><td>$ 5.6</td><td></td><td>$ 13.7</td><td></td></tr><tr><td>Easements (a) Easements (a)</td><td>$ 27.2</td><td></td><td>$ 8.3</td><td></td><td>$ 8.4</td><td></td><td>$ 8.5</td><td></td><td>$ 8.5</td><td></td><td>$ 212.0</td><td></td></tr><tr><td>PPAs (b) PPAs (b)</td><td>$ 134.6</td><td></td><td>$ 136.0</td><td></td><td>$ 130.1</td><td></td><td>$ 133.3</td><td></td><td>$ 134.1</td><td></td><td>$ 797.3</td><td></td></tr><tr><td>Other Purchase Obligations (c) Other Purchase Obligations (c)</td><td>$ 31.8</td><td></td><td>$ 9.6</td><td></td><td>$ 10.3</td><td></td><td>—</td><td></td><td>—</td><td></td><td>—</td><td></td></tr></table>
table
—
monetaryItemType
table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Other Purchase Obligations (c) Other Purchase Obligations (c) | $ 31.8 | $ 9.6 | $ 10.3 | — | — | — </context>
us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Summary of Common Stock</td><td>Shares</td><td>Equity</td></tr><tr><td></td><td>Thousands</td><td>Millions</td></tr><tr><td>Balance as of December 31, 2021</td><td>53,220</td><td></td><td>$ 1,536.7</td><td></td></tr><tr><td>Employee Stock Purchase Plan</td><td>11</td><td></td><td>0.9</td><td></td></tr><tr><td>Invest Direct</td><td>244</td><td></td><td>14.9</td><td></td></tr><tr><td>Share-Based Compensation</td><td>82</td><td></td><td>5.3</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Equity Issuance</td><td>3,680</td><td></td><td>223.7</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Balance as of December 31, 2022</td><td>57,237</td><td></td><td>1,781.5</td><td></td></tr><tr><td>Employee Stock Purchase Plan</td><td>16</td><td></td><td>0.8</td><td></td></tr><tr><td>Invest Direct</td><td>232</td><td></td><td>13.3</td><td></td></tr><tr><td>Share-Based Compensation</td><td>76</td><td></td><td>8.1</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Balance as of December 31, 2023</td><td>57,561</td><td></td><td>1,803.7</td><td></td></tr><tr><td>Employee Stock Purchase Plan</td><td>16</td><td></td><td>0.9</td><td></td></tr><tr><td>Invest Direct</td><td>197</td><td></td><td>12.4</td><td></td></tr><tr><td>Share-Based Compensation</td><td>108</td><td></td><td>6.2</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Balance as of December 31, 2024</td><td>57,882</td><td></td><td>$ 1,823.2</td><td></td></tr></table>
table
53220
sharesItemType
table: <entity> 53220 </entity> <entity type> sharesItemType </entity type> <context> Balance as of December 31, 2021 | 53,220 | $ 1,536.7 </context>
us-gaap:CommonStockSharesOutstanding
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Summary of Common Stock</td><td>Shares</td><td>Equity</td></tr><tr><td></td><td>Thousands</td><td>Millions</td></tr><tr><td>Balance as of December 31, 2021</td><td>53,220</td><td></td><td>$ 1,536.7</td><td></td></tr><tr><td>Employee Stock Purchase Plan</td><td>11</td><td></td><td>0.9</td><td></td></tr><tr><td>Invest Direct</td><td>244</td><td></td><td>14.9</td><td></td></tr><tr><td>Share-Based Compensation</td><td>82</td><td></td><td>5.3</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Equity Issuance</td><td>3,680</td><td></td><td>223.7</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Balance as of December 31, 2022</td><td>57,237</td><td></td><td>1,781.5</td><td></td></tr><tr><td>Employee Stock Purchase Plan</td><td>16</td><td></td><td>0.8</td><td></td></tr><tr><td>Invest Direct</td><td>232</td><td></td><td>13.3</td><td></td></tr><tr><td>Share-Based Compensation</td><td>76</td><td></td><td>8.1</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Balance as of December 31, 2023</td><td>57,561</td><td></td><td>1,803.7</td><td></td></tr><tr><td>Employee Stock Purchase Plan</td><td>16</td><td></td><td>0.9</td><td></td></tr><tr><td>Invest Direct</td><td>197</td><td></td><td>12.4</td><td></td></tr><tr><td>Share-Based Compensation</td><td>108</td><td></td><td>6.2</td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td></td><td></td><td></td></tr><tr><td>Balance as of December 31, 2024</td><td>57,882</td><td></td><td>$ 1,823.2</td><td></td></tr></table>
table
1536.7
monetaryItemType
table: <entity> 1536.7 </entity> <entity type> monetaryItemType </entity type> <context> Balance as of December 31, 2021 | 53,220 | $ 1,536.7 </context>
us-gaap:CommonStockValueOutstanding