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On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . The Amended Facility does not amortize and is unsecured. Borrowings may be made at inter...
text
175.0
percentItemType
text: <entity> 175.0 </entity> <entity type> percentItemType </entity type> <context> On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . Th...
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . The Amended Facility does not amortize and is unsecured. Borrowings may be made at inter...
text
0.0
percentItemType
text: <entity> 0.0 </entity> <entity type> percentItemType </entity type> <context> On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . The ...
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . The Amended Facility does not amortize and is unsecured. Borrowings may be made at inter...
text
75.0
percentItemType
text: <entity> 75.0 </entity> <entity type> percentItemType </entity type> <context> On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . The...
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . The Amended Facility does not amortize and is unsecured. Borrowings may be made at inter...
text
400.0
monetaryItemType
text: <entity> 400.0 </entity> <entity type> monetaryItemType </entity type> <context> On November 29, 2023, NW Corp amended its existing $ 425.0 million revolving credit facility (the Amended Facility) to address the holding company reorganization and extended the maturity date of the facility to November 29, 2028 . T...
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
On January 24, 2025, NW Corp amended its existing $ 400.0 million Amended Facility to increase the capacity to $ 425.0 million. This amendment did not affect the maturity date or borrowing rates.
text
400.0
monetaryItemType
text: <entity> 400.0 </entity> <entity type> monetaryItemType </entity type> <context> On January 24, 2025, NW Corp amended its existing $ 400.0 million Amended Facility to increase the capacity to $ 425.0 million. This amendment did not affect the maturity date or borrowing rates. </context>
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
On January 24, 2025, NW Corp amended its existing $ 400.0 million Amended Facility to increase the capacity to $ 425.0 million. This amendment did not affect the maturity date or borrowing rates.
text
425.0
monetaryItemType
text: <entity> 425.0 </entity> <entity type> monetaryItemType </entity type> <context> On January 24, 2025, NW Corp amended its existing $ 400.0 million Amended Facility to increase the capacity to $ 425.0 million. This amendment did not affect the maturity date or borrowing rates. </context>
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
On March 25, 2023, we amended our existing $ 25.0 million swingline credit facility (the Swingline Facility) to extend the maturity date of the facility from March 27, 2024 to March 27, 2025 . The Swingline Facility does not amortize and is unsecured. Borrowings may be made at interest rates equal to (a) SOFR, plus a m...
text
25.0
monetaryItemType
text: <entity> 25.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 25, 2023, we amended our existing $ 25.0 million swingline credit facility (the Swingline Facility) to extend the maturity date of the facility from March 27, 2024 to March 27, 2025 . The Swingline Facility does not amortize ...
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
On March 25, 2023, we amended our existing $ 25.0 million swingline credit facility (the Swingline Facility) to extend the maturity date of the facility from March 27, 2024 to March 27, 2025 . The Swingline Facility does not amortize and is unsecured. Borrowings may be made at interest rates equal to (a) SOFR, plus a m...
text
90.0
percentItemType
text: <entity> 90.0 </entity> <entity type> percentItemType </entity type> <context> On March 25, 2023, we amended our existing $ 25.0 million swingline credit facility (the Swingline Facility) to extend the maturity date of the facility from March 27, 2024 to March 27, 2025 . The Swingline Facility does not amortize a...
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
On March 25, 2023, we amended our existing $ 25.0 million swingline credit facility (the Swingline Facility) to extend the maturity date of the facility from March 27, 2024 to March 27, 2025 . The Swingline Facility does not amortize and is unsecured. Borrowings may be made at interest rates equal to (a) SOFR, plus a m...
text
12.5
percentItemType
text: <entity> 12.5 </entity> <entity type> percentItemType </entity type> <context> On March 25, 2023, we amended our existing $ 25.0 million swingline credit facility (the Swingline Facility) to extend the maturity date of the facility from March 27, 2024 to March 27, 2025 . The Swingline Facility does not amortize a...
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
On January 2, 2024, NW Corp terminated its $ 100.0 million Additional Credit Facility. On January 4, 2024, NW Corp terminated its $ 25.0 million Swingline Facility.
text
100.0
monetaryItemType
text: <entity> 100.0 </entity> <entity type> monetaryItemType </entity type> <context> On January 2, 2024, NW Corp terminated its $ 100.0 million Additional Credit Facility. On January 4, 2024, NW Corp terminated its $ 25.0 million Swingline Facility. </context>
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
On January 2, 2024, NW Corp terminated its $ 100.0 million Additional Credit Facility. On January 4, 2024, NW Corp terminated its $ 25.0 million Swingline Facility.
text
25.0
monetaryItemType
text: <entity> 25.0 </entity> <entity type> monetaryItemType </entity type> <context> On January 2, 2024, NW Corp terminated its $ 100.0 million Additional Credit Facility. On January 4, 2024, NW Corp terminated its $ 25.0 million Swingline Facility. </context>
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
million for NWE Public Service (the HoldCo and NWE Public Service Credit Facility). The HoldCo and NWE Public Service Credit Facility has a maturity date of November 29, 2028. Upon the completion of the holding company reorganization on January 1, 2024, this credit facility became effective. The HoldCo and NWE Public S...
text
100.0
monetaryItemType
text: <entity> 100.0 </entity> <entity type> monetaryItemType </entity type> <context> million for NWE Public Service (the HoldCo and NWE Public Service Credit Facility). The HoldCo and NWE Public Service Credit Facility has a maturity date of November 29, 2028. Upon the completion of the holding company reorganization...
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
million for NWE Public Service (the HoldCo and NWE Public Service Credit Facility). The HoldCo and NWE Public Service Credit Facility has a maturity date of November 29, 2028. Upon the completion of the holding company reorganization on January 1, 2024, this credit facility became effective. The HoldCo and NWE Public S...
text
200.0
monetaryItemType
text: <entity> 200.0 </entity> <entity type> monetaryItemType </entity type> <context> million for NWE Public Service (the HoldCo and NWE Public Service Credit Facility). The HoldCo and NWE Public Service Credit Facility has a maturity date of November 29, 2028. Upon the completion of the holding company reorganization...
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
Commitment fees for the unsecured revolving lines of credit were $ 0.7 million and $ 0.6 million for the years ended December 31, 2024 and 2023.
text
0.7
monetaryItemType
text: <entity> 0.7 </entity> <entity type> monetaryItemType </entity type> <context> Commitment fees for the unsecured revolving lines of credit were $ 0.7 million and $ 0.6 million for the years ended December 31, 2024 and 2023. </context>
us-gaap:LineOfCreditFacilityCommitmentFeeAmount
Commitment fees for the unsecured revolving lines of credit were $ 0.7 million and $ 0.6 million for the years ended December 31, 2024 and 2023.
text
0.6
monetaryItemType
text: <entity> 0.6 </entity> <entity type> monetaryItemType </entity type> <context> Commitment fees for the unsecured revolving lines of credit were $ 0.7 million and $ 0.6 million for the years ended December 31, 2024 and 2023. </context>
us-gaap:LineOfCreditFacilityCommitmentFeeAmount
On March 30, 2023, we issued and sold $ 239.0 million aggregate principal amount of Montana First Mortgage Bonds (the bonds) at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On this same day, we issued and sold $ 31.0 million
text
239.0
monetaryItemType
text: <entity> 239.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 30, 2023, we issued and sold $ 239.0 million aggregate principal amount of Montana First Mortgage Bonds (the bonds) at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On this same day, we issued and sold $...
us-gaap:DebtInstrumentFaceAmount
On March 30, 2023, we issued and sold $ 239.0 million aggregate principal amount of Montana First Mortgage Bonds (the bonds) at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On this same day, we issued and sold $ 31.0 million
text
5.57
percentItemType
text: <entity> 5.57 </entity> <entity type> percentItemType </entity type> <context> On March 30, 2023, we issued and sold $ 239.0 million aggregate principal amount of Montana First Mortgage Bonds (the bonds) at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On this same day, we issued and sold $ 3...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On March 30, 2023, we issued and sold $ 239.0 million aggregate principal amount of Montana First Mortgage Bonds (the bonds) at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On this same day, we issued and sold $ 31.0 million
text
31.0
monetaryItemType
text: <entity> 31.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 30, 2023, we issued and sold $ 239.0 million aggregate principal amount of Montana First Mortgage Bonds (the bonds) at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On this same day, we issued and sold $ ...
us-gaap:DebtInstrumentFaceAmount
aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On May 1, 2023, we issued and sold an additional $ 30 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.42 percent maturing on May 1, ...
text
5.57
percentItemType
text: <entity> 5.57 </entity> <entity type> percentItemType </entity type> <context> aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On May 1, 2023, we issued and sold an additional $ 30 million aggregate principal amount of South Dak...
us-gaap:DebtInstrumentInterestRateStatedPercentage
aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On May 1, 2023, we issued and sold an additional $ 30 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.42 percent maturing on May 1, ...
text
30
monetaryItemType
text: <entity> 30 </entity> <entity type> monetaryItemType </entity type> <context> aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On May 1, 2023, we issued and sold an additional $ 30 million aggregate principal amount of South Dako...
us-gaap:DebtInstrumentFaceAmount
aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On May 1, 2023, we issued and sold an additional $ 30 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.42 percent maturing on May 1, ...
text
5.42
percentItemType
text: <entity> 5.42 </entity> <entity type> percentItemType </entity type> <context> aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.57 percent maturing on March 30, 2033 . On May 1, 2023, we issued and sold an additional $ 30 million aggregate principal amount of South Dak...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On June 29, 2023, the City of Forsyth, Rosebud County, Montana issued $ 144.7 million principal amount of Pollution Control Revenue Refunding Bonds (2023 Pollution Control Bonds) on our behalf. The 2023 Pollution Control Bonds were issued at a fixed interest rate of 3.88 percent maturing on July 1, 2028 . The proceeds ...
text
144.7
monetaryItemType
text: <entity> 144.7 </entity> <entity type> monetaryItemType </entity type> <context> On June 29, 2023, the City of Forsyth, Rosebud County, Montana issued $ 144.7 million principal amount of Pollution Control Revenue Refunding Bonds (2023 Pollution Control Bonds) on our behalf. The 2023 Pollution Control Bonds were i...
us-gaap:DebtInstrumentFaceAmount
On June 29, 2023, the City of Forsyth, Rosebud County, Montana issued $ 144.7 million principal amount of Pollution Control Revenue Refunding Bonds (2023 Pollution Control Bonds) on our behalf. The 2023 Pollution Control Bonds were issued at a fixed interest rate of 3.88 percent maturing on July 1, 2028 . The proceeds ...
text
3.88
percentItemType
text: <entity> 3.88 </entity> <entity type> percentItemType </entity type> <context> On June 29, 2023, the City of Forsyth, Rosebud County, Montana issued $ 144.7 million principal amount of Pollution Control Revenue Refunding Bonds (2023 Pollution Control Bonds) on our behalf. The 2023 Pollution Control Bonds were iss...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On June 29, 2023, the City of Forsyth, Rosebud County, Montana issued $ 144.7 million principal amount of Pollution Control Revenue Refunding Bonds (2023 Pollution Control Bonds) on our behalf. The 2023 Pollution Control Bonds were issued at a fixed interest rate of 3.88 percent maturing on July 1, 2028 . The proceeds ...
text
2.00
percentItemType
text: <entity> 2.00 </entity> <entity type> percentItemType </entity type> <context> On June 29, 2023, the City of Forsyth, Rosebud County, Montana issued $ 144.7 million principal amount of Pollution Control Revenue Refunding Bonds (2023 Pollution Control Bonds) on our behalf. The 2023 Pollution Control Bonds were iss...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On March 28, 2024, NW Corp issued and sold $ 175.0 million aggregate principal amount of Montana First Mortgage Bonds at a fixed interest rate of 5.56 percent maturing on March 28, 2031 . These bonds were issued in transactions exempt from the registration requirements of the Securities Act of 1933. Proceeds were used ...
text
175.0
monetaryItemType
text: <entity> 175.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 28, 2024, NW Corp issued and sold $ 175.0 million aggregate principal amount of Montana First Mortgage Bonds at a fixed interest rate of 5.56 percent maturing on March 28, 2031 . These bonds were issued in transactions exemp...
us-gaap:DebtInstrumentFaceAmount
On March 28, 2024, NW Corp issued and sold $ 175.0 million aggregate principal amount of Montana First Mortgage Bonds at a fixed interest rate of 5.56 percent maturing on March 28, 2031 . These bonds were issued in transactions exempt from the registration requirements of the Securities Act of 1933. Proceeds were used ...
text
5.56
percentItemType
text: <entity> 5.56 </entity> <entity type> percentItemType </entity type> <context> On March 28, 2024, NW Corp issued and sold $ 175.0 million aggregate principal amount of Montana First Mortgage Bonds at a fixed interest rate of 5.56 percent maturing on March 28, 2031 . These bonds were issued in transactions exempt ...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On March 28, 2024, NW Corp issued and sold $ 175.0 million aggregate principal amount of Montana First Mortgage Bonds at a fixed interest rate of 5.56 percent maturing on March 28, 2031 . These bonds were issued in transactions exempt from the registration requirements of the Securities Act of 1933. Proceeds were used ...
text
100.0
monetaryItemType
text: <entity> 100.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 28, 2024, NW Corp issued and sold $ 175.0 million aggregate principal amount of Montana First Mortgage Bonds at a fixed interest rate of 5.56 percent maturing on March 28, 2031 . These bonds were issued in transactions exemp...
us-gaap:DebtInstrumentFaceAmount
On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.75 pe...
text
33.0
monetaryItemType
text: <entity> 33.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate pri...
us-gaap:DebtInstrumentFaceAmount
On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.75 pe...
text
5.55
percentItemType
text: <entity> 5.55 </entity> <entity type> percentItemType </entity type> <context> On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate prin...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.75 pe...
text
7.0
monetaryItemType
text: <entity> 7.0 </entity> <entity type> monetaryItemType </entity type> <context> On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate prin...
us-gaap:DebtInstrumentFaceAmount
On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.75 pe...
text
5.75
percentItemType
text: <entity> 5.75 </entity> <entity type> percentItemType </entity type> <context> On March 28, 2024, NWE Public Service issued and sold $ 33.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.55 percent maturing on March 28, 2029 , and $ 7.0 million aggregate prin...
us-gaap:DebtInstrumentInterestRateStatedPercentage
The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029.
text
303.6
monetaryItemType
text: <entity> 303.6 </entity> <entity type> monetaryItemType </entity type> <context> The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029. </context>
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029.
text
106.9
monetaryItemType
text: <entity> 106.9 </entity> <entity type> monetaryItemType </entity type> <context> The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029. </context>
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029.
text
592.7
monetaryItemType
text: <entity> 592.7 </entity> <entity type> monetaryItemType </entity type> <context> The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029. </context>
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029.
text
33.0
monetaryItemType
text: <entity> 33.0 </entity> <entity type> monetaryItemType </entity type> <context> The aggregate minimum principal maturities of long-term debt and finance leases, during the next five years are $ 303.6 million in 2025, $ 106.9 million in 2026, $ 592.7 million in 2028, and $ 33.0 million in 2029. </context>
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
As of December 31, 2024, our total federal NOL carryforward was approximately $ 486.6 million. Our federal NOL carryforward does not expire. Our state NOL carryforward as of December 31, 2024 was approximately $ 391.2 million. If unused, our state NOL carryforwards will expire in 2033. We believe it is more likely than...
text
486.6
monetaryItemType
text: <entity> 486.6 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, our total federal NOL carryforward was approximately $ 486.6 million. Our federal NOL carryforward does not expire. Our state NOL carryforward as of December 31, 2024 was approximately $ 391.2 million. If unu...
us-gaap:OperatingLossCarryforwards
Our unrecognized tax benefits include approximately $ 7.4 million and $ 24.4 million related to tax positions as of December 31, 2024 and 2023, that if recognized, would impact our annual effective tax rate. During the year ending December 31, 2024, due to the expiration of the statute of limitations we decreased our u...
text
7.4
monetaryItemType
text: <entity> 7.4 </entity> <entity type> monetaryItemType </entity type> <context> Our unrecognized tax benefits include approximately $ 7.4 million and $ 24.4 million related to tax positions as of December 31, 2024 and 2023, that if recognized, would impact our annual effective tax rate. During the year ending Dece...
us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Our unrecognized tax benefits include approximately $ 7.4 million and $ 24.4 million related to tax positions as of December 31, 2024 and 2023, that if recognized, would impact our annual effective tax rate. During the year ending December 31, 2024, due to the expiration of the statute of limitations we decreased our u...
text
24.4
monetaryItemType
text: <entity> 24.4 </entity> <entity type> monetaryItemType </entity type> <context> Our unrecognized tax benefits include approximately $ 7.4 million and $ 24.4 million related to tax positions as of December 31, 2024 and 2023, that if recognized, would impact our annual effective tax rate. During the year ending Dec...
us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Our unrecognized tax benefits include approximately $ 7.4 million and $ 24.4 million related to tax positions as of December 31, 2024 and 2023, that if recognized, would impact our annual effective tax rate. During the year ending December 31, 2024, due to the expiration of the statute of limitations we decreased our u...
text
16.9
monetaryItemType
text: <entity> 16.9 </entity> <entity type> monetaryItemType </entity type> <context> Our unrecognized tax benefits include approximately $ 7.4 million and $ 24.4 million related to tax positions as of December 31, 2024 and 2023, that if recognized, would impact our annual effective tax rate. During the year ending Dec...
us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease
and decreased our total unrecognized tax benefits by $ 0.5 million and recognized an income tax benefit of approximately $ 3.2 million for previously unrecognized tax ben
text
0.5
monetaryItemType
text: <entity> 0.5 </entity> <entity type> monetaryItemType </entity type> <context> and decreased our total unrecognized tax benefits by $ 0.5 million and recognized an income tax benefit of approximately $ 3.2 million for previously unrecognized tax ben </context>
us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease
efits. In the next twelve months we expect the statute of limitations to expire for certain unrecognized tax benefits, which would result in a decrease to our total unrecognized tax benefits of approximately $ 9.4 million.
text
9.4
monetaryItemType
text: <entity> 9.4 </entity> <entity type> monetaryItemType </entity type> <context> efits. In the next twelve months we expect the statute of limitations to expire for certain unrecognized tax benefits, which would result in a decrease to our total unrecognized tax benefits of approximately $ 9.4 million. </context>
us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
Our policy is to recognize interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2024, we have accrued $ 3.0 million for the payment of interest and penalties in the Consolidated Balance Sheets. As of December 31, 2023, we had $ 4.5 million accrued for the payment of inte...
text
3.0
monetaryItemType
text: <entity> 3.0 </entity> <entity type> monetaryItemType </entity type> <context> Our policy is to recognize interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2024, we have accrued $ 3.0 million for the payment of interest and penalties in the Consolidated Balance ...
us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Our policy is to recognize interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2024, we have accrued $ 3.0 million for the payment of interest and penalties in the Consolidated Balance Sheets. As of December 31, 2023, we had $ 4.5 million accrued for the payment of inte...
text
4.5
monetaryItemType
text: <entity> 4.5 </entity> <entity type> monetaryItemType </entity type> <context> Our policy is to recognize interest and penalties related to unrecognized tax benefits in income tax expense. As of December 31, 2024, we have accrued $ 3.0 million for the payment of interest and penalties in the Consolidated Balance ...
us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
(1) In October 2023, we entered into a group annuity contract from an insurance company to provide for the payment of pension benefits to select NorthWestern Energy MT Pension Plan participants. We purchased the contract with $ 51.9 million of plan assets in 2023. A trailing premium of $ 0.8 million related to final da...
text
0.8
monetaryItemType
text: <entity> 0.8 </entity> <entity type> monetaryItemType </entity type> <context> (1) In October 2023, we entered into a group annuity contract from an insurance company to provide for the payment of pension benefits to select NorthWestern Energy MT Pension Plan participants. We purchased the contract with $ 51.9 mi...
us-gaap:DefinedBenefitPlanBenefitObligationPaymentForSettlement
(1) In October 2023, we entered into a group annuity contract from an insurance company to provide for the payment of pension benefits to select NorthWestern Energy MT Pension Plan participants. We purchased the contract with $ 51.9 million of plan assets in 2023. A trailing premium of $ 0.8 million related to final da...
text
52.7
monetaryItemType
text: <entity> 52.7 </entity> <entity type> monetaryItemType </entity type> <context> (1) In October 2023, we entered into a group annuity contract from an insurance company to provide for the payment of pension benefits to select NorthWestern Energy MT Pension Plan participants. We purchased the contract with $ 51.9 m...
us-gaap:DefinedBenefitPlanBenefitObligationPaymentForSettlement
(1) In October 2023, we entered into a group annuity contract from an insurance company to provide for the payment of pension benefits to select NorthWestern Energy MT Pension Plan participants. We purchased the contract with $ 51.9 million of plan assets in 2023. A trailing premium of $ 0.8 million related to final da...
text
4.4
monetaryItemType
text: <entity> 4.4 </entity> <entity type> monetaryItemType </entity type> <context> (1) In October 2023, we entered into a group annuity contract from an insurance company to provide for the payment of pension benefits to select NorthWestern Energy MT Pension Plan participants. We purchased the contract with $ 51.9 mi...
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
On an annual basis, we set the discount rate using a yield curve analysis. This analysis includes constructing a hypothetical bond portfolio whose cash flow from coupons and maturities matches the year-by-year, projected benefit cash flow from our plans. The increase in the discount rate during 2024 decreased our proje...
text
29.6
monetaryItemType
text: <entity> 29.6 </entity> <entity type> monetaryItemType </entity type> <context> On an annual basis, we set the discount rate using a yield curve analysis. This analysis includes constructing a hypothetical bond portfolio whose cash flow from coupons and maturities matches the year-by-year, projected benefit cash ...
us-gaap:DefinedBenefitPlanOtherChanges
In determining the expected long-term rate of return on plan assets, we review historical returns, the future expectations for returns for each asset class weighted by the target asset allocation of the pension and postretirement portfolios, and long-term inflation assumptions. Based on the target asset allocation for ...
text
6.17
percentItemType
text: <entity> 6.17 </entity> <entity type> percentItemType </entity type> <context> In determining the expected long-term rate of return on plan assets, we review historical returns, the future expectations for returns for each asset class weighted by the target asset allocation of the pension and postretirement portf...
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
In determining the expected long-term rate of return on plan assets, we review historical returns, the future expectations for returns for each asset class weighted by the target asset allocation of the pension and postretirement portfolios, and long-term inflation assumptions. Based on the target asset allocation for ...
text
4.58
percentItemType
text: <entity> 4.58 </entity> <entity type> percentItemType </entity type> <context> In determining the expected long-term rate of return on plan assets, we review historical returns, the future expectations for returns for each asset class weighted by the target asset allocation of the pension and postretirement portf...
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
The postretirement benefit obligation is calculated assuming that health care costs increase by a 5.00 percent fixed rate. The company contribution toward the premium cost is capped, therefore future health care cost trend rates are expected to have a minimal impact on company costs and the accumulated postretirement b...
text
5.00
percentItemType
text: <entity> 5.00 </entity> <entity type> percentItemType </entity type> <context> The postretirement benefit obligation is calculated assuming that health care costs increase by a 5.00 percent fixed rate. The company contribution toward the premium cost is capped, therefore future health care cost trend rates are ex...
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
We grant stock-based awards through our Amended and Restated Equity Compensation Plan (ECP), which includes restricted stock awards and performance share awards. As of December 31, 2024, there were 558,300 shares of common stock remaining available for grants. The remaining vesting period for awards previously granted ...
text
558300
sharesItemType
text: <entity> 558300 </entity> <entity type> sharesItemType </entity type> <context> We grant stock-based awards through our Amended and Restated Equity Compensation Plan (ECP), which includes restricted stock awards and performance share awards. As of December 31, 2024, there were 558,300 shares of common stock remai...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
3.4
monetaryItemType
text: <entity> 3.4 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:AllocatedShareBasedCompensationExpense
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
3.6
monetaryItemType
text: <entity> 3.6 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:AllocatedShareBasedCompensationExpense
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
4.2
monetaryItemType
text: <entity> 4.2 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:AllocatedShareBasedCompensationExpense
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
0.7
monetaryItemType
text: <entity> 0.7 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
1.0
monetaryItemType
text: <entity> 1.0 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
1.3
monetaryItemType
text: <entity> 1.3 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
6.6
monetaryItemType
text: <entity> 6.6 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
3.1
monetaryItemType
text: <entity> 3.1 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
4.4
monetaryItemType
text: <entity> 4.4 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) million, and $( 1.3 ) million for the years ended December 31, 2024, 2023, and 2022, r...
text
4.3
monetaryItemType
text: <entity> 4.3 </entity> <entity type> monetaryItemType </entity type> <context> We recognized total stock-based compensation expense of $ 3.4 million, $ 3.6 million, and $ 4.2 million for the years ended December 31, 2024, 2023, and 2022, respectively, and related income tax benefit of $( 0.7 ) million, $( 1.0 ) m...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for the incentive plan awards. For further detail of grants under this plan see
text
200000000
sharesItemType
text: <entity> 200000000 </entity> <entity type> sharesItemType </entity type> <context> We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for...
us-gaap:CommonStockSharesAuthorized
We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for the incentive plan awards. For further detail of grants under this plan see
text
0.01
perShareItemType
text: <entity> 0.01 </entity> <entity type> perShareItemType </entity type> <context> We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for th...
us-gaap:CommonStockParOrStatedValuePerShare
We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for the incentive plan awards. For further detail of grants under this plan see
text
50000000
sharesItemType
text: <entity> 50000000 </entity> <entity type> sharesItemType </entity type> <context> We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for ...
us-gaap:PreferredStockSharesAuthorized
We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for the incentive plan awards. For further detail of grants under this plan see
text
0.01
perShareItemType
text: <entity> 0.01 </entity> <entity type> perShareItemType </entity type> <context> We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for th...
us-gaap:PreferredStockParOrStatedValuePerShare
We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for the incentive plan awards. For further detail of grants under this plan see
text
2856957
sharesItemType
text: <entity> 2856957 </entity> <entity type> sharesItemType </entity type> <context> We have 250,000,000 shares authorized consisting of 200,000,000 shares of common stock with a $ 0.01 par value and 50,000,000 shares of preferred stock with a $ 0.01 par value. Of the common stock, 2,856,957 shares are reserved for t...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Shares tendered by employees to us to satisfy the employees' tax withholding obligations in connection with the vesting of restricted stock awards totaled 5,809 and 4,167 during the years ended December 31, 2024 and 2023, respectively, and are reflected in treasury stock. These shares were credited to treasury stock ba...
text
5809
sharesItemType
text: <entity> 5809 </entity> <entity type> sharesItemType </entity type> <context> Shares tendered by employees to us to satisfy the employees' tax withholding obligations in connection with the vesting of restricted stock awards totaled 5,809 and 4,167 during the years ended December 31, 2024 and 2023, respectively, ...
us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
Shares tendered by employees to us to satisfy the employees' tax withholding obligations in connection with the vesting of restricted stock awards totaled 5,809 and 4,167 during the years ended December 31, 2024 and 2023, respectively, and are reflected in treasury stock. These shares were credited to treasury stock ba...
text
4167
sharesItemType
text: <entity> 4167 </entity> <entity type> sharesItemType </entity type> <context> Shares tendered by employees to us to satisfy the employees' tax withholding obligations in connection with the vesting of restricted stock awards totaled 5,809 and 4,167 during the years ended December 31, 2024 and 2023, respectively, ...
us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
As of December 31, 2024, there were 22,470 shares from performance and restricted share awards which were antidilutive and excluded from the earnings per share calculations.
text
22470
sharesItemType
text: <entity> 22470 </entity> <entity type> sharesItemType </entity type> <context> As of December 31, 2024, there were 22,470 shares from performance and restricted share awards which were antidilutive and excluded from the earnings per share calculations. </context>
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Our QF liability primarily consists of unrecoverable costs associated with three contracts covered under the PURPA. These contracts require us to purchase minimum amounts of energy at prices ranging from $ 118 to $ 130 per MWH through 2029. As of December 31, 2024, our estimated gross contractual obligation related to ...
text
229.0
monetaryItemType
text: <entity> 229.0 </entity> <entity type> monetaryItemType </entity type> <context> Our QF liability primarily consists of unrecoverable costs associated with three contracts covered under the PURPA. These contracts require us to purchase minimum amounts of energy at prices ranging from $ 118 to $ 130 per MWH throug...
us-gaap:RecordedUnconditionalPurchaseObligation
Our QF liability primarily consists of unrecoverable costs associated with three contracts covered under the PURPA. These contracts require us to purchase minimum amounts of energy at prices ranging from $ 118 to $ 130 per MWH through 2029. As of December 31, 2024, our estimated gross contractual obligation related to ...
text
205.8
monetaryItemType
text: <entity> 205.8 </entity> <entity type> monetaryItemType </entity type> <context> Our QF liability primarily consists of unrecoverable costs associated with three contracts covered under the PURPA. These contracts require us to purchase minimum amounts of energy at prices ranging from $ 118 to $ 130 per MWH throug...
us-gaap:RecordedUnconditionalPurchaseObligation
We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the ...
text
345.8
monetaryItemType
text: <entity> 345.8 </entity> <entity type> monetaryItemType </entity type> <context> We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these ...
us-gaap:PurchaseObligationDueInNextTwelveMonths
We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the ...
text
365.2
monetaryItemType
text: <entity> 365.2 </entity> <entity type> monetaryItemType </entity type> <context> We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these ...
us-gaap:PurchaseObligationDueInSecondYear
We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the ...
text
350.4
monetaryItemType
text: <entity> 350.4 </entity> <entity type> monetaryItemType </entity type> <context> We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these ...
us-gaap:PurchaseObligationDueInThirdYear
We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the ...
text
349.3
monetaryItemType
text: <entity> 349.3 </entity> <entity type> monetaryItemType </entity type> <context> We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these ...
us-gaap:PurchaseObligationDueInFourthYear
We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the ...
text
350.2
monetaryItemType
text: <entity> 350.2 </entity> <entity type> monetaryItemType </entity type> <context> We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these ...
us-gaap:PurchaseObligationDueInFifthYear
We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these contracts are included in Fuel, purchased power and direct transmission expense in the ...
text
2.5
monetaryItemType
text: <entity> 2.5 </entity> <entity type> monetaryItemType </entity type> <context> We have entered into various commitments, largely purchased power, electric transmission, coal and natural gas supply and natural gas transportation contracts. These commitments range from one to 24 years. Costs incurred under these co...
us-gaap:PurchaseObligationDueAfterFifthYear
spend approximately $ 19.1 million between 2025 and 2040. These commitments are not reflected in our Consolidated Financial Statements.
text
19.1
monetaryItemType
text: <entity> 19.1 </entity> <entity type> monetaryItemType </entity type> <context> spend approximately $ 19.1 million between 2025 and 2040. These commitments are not reflected in our Consolidated Financial Statements. </context>
us-gaap:OtherCommitment
Our environmental exposure includes a number of components, including remediation expenses related to the cleanup of current or former properties, and costs to comply with changing environmental regulations related to our operations. At present, our environmental reserve, which relates primarily to the remediation of f...
text
23.7
monetaryItemType
text: <entity> 23.7 </entity> <entity type> monetaryItemType </entity type> <context> Our environmental exposure includes a number of components, including remediation expenses related to the cleanup of current or former properties, and costs to comply with changing environmental regulations related to our operations. ...
us-gaap:AccrualForEnvironmentalLossContingencies
- Approximately $ 18.2 million of our environmental reserve accrual is related to the following manufactured gas plants.
text
18.2
monetaryItemType
text: <entity> 18.2 </entity> <entity type> monetaryItemType </entity type> <context> - Approximately $ 18.2 million of our environmental reserve accrual is related to the following manufactured gas plants. </context>
us-gaap:AccrualForEnvironmentalLossContingencies
- A formerly operated manufactured gas plant located in Aberdeen, South Dakota, has been identified on the Federal Comprehensive Environmental Response, Compensation, and Liability Information System list as contaminated with coal tar residue. We are currently conducting feasibility studies, implementing remedial actio...
text
7.2
monetaryItemType
text: <entity> 7.2 </entity> <entity type> monetaryItemType </entity type> <context> - A formerly operated manufactured gas plant located in Aberdeen, South Dakota, has been identified on the Federal Comprehensive Environmental Response, Compensation, and Liability Information System list as contaminated with coal tar ...
us-gaap:AccrualForEnvironmentalLossContingencies
There were $ 91.2 million and $ 39.0 million of cash dividends paid to NorthWestern Energy Group from wholly-owned subsidiaries for the year ending December 31, 2024 , and December 31, 2023, respectively.
text
91.2
monetaryItemType
text: <entity> 91.2 </entity> <entity type> monetaryItemType </entity type> <context> There were $ 91.2 million and $ 39.0 million of cash dividends paid to NorthWestern Energy Group from wholly-owned subsidiaries for the year ending December 31, 2024 , and December 31, 2023, respectively. </context>
us-gaap:ProceedsFromContributionsFromAffiliates
There were $ 91.2 million and $ 39.0 million of cash dividends paid to NorthWestern Energy Group from wholly-owned subsidiaries for the year ending December 31, 2024 , and December 31, 2023, respectively.
text
39.0
monetaryItemType
text: <entity> 39.0 </entity> <entity type> monetaryItemType </entity type> <context> There were $ 91.2 million and $ 39.0 million of cash dividends paid to NorthWestern Energy Group from wholly-owned subsidiaries for the year ending December 31, 2024 , and December 31, 2023, respectively. </context>
us-gaap:ProceedsFromContributionsFromAffiliates
As of December 31, 2024, the Company had ownership interests in approximately 119 consolidated real estate properties located in 17 states. The properties in which the Company has an interest are primarily net leased to tenants in various industries.
text
119
integerItemType
text: <entity> 119 </entity> <entity type> integerItemType </entity type> <context> As of December 31, 2024, the Company had ownership interests in approximately 119 consolidated real estate properties located in 17 states. The properties in which the Company has an interest are primarily net leased to tenants in vario...
us-gaap:NumberOfRealEstateProperties
As of December 31, 2024, the Company had ownership interests in approximately 119 consolidated real estate properties located in 17 states. The properties in which the Company has an interest are primarily net leased to tenants in various industries.
text
17
integerItemType
text: <entity> 17 </entity> <entity type> integerItemType </entity type> <context> As of December 31, 2024, the Company had ownership interests in approximately 119 consolidated real estate properties located in 17 states. The properties in which the Company has an interest are primarily net leased to tenants in variou...
us-gaap:NumberOfStatesInWhichEntityOperates
In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per share, for a total value of approximately $ 7,800 . As the Company previously consoli...
text
730623.5
sharesItemType
text: <entity> 730623.5 </entity> <entity type> sharesItemType </entity type> <context> In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 p...
us-gaap:ConversionOfStockSharesConverted1
In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per share, for a total value of approximately $ 7,800 . As the Company previously consoli...
text
822627
sharesItemType
text: <entity> 822627 </entity> <entity type> sharesItemType </entity type> <context> In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per...
us-gaap:ConversionOfStockSharesIssued1
In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per share, for a total value of approximately $ 7,800 . As the Company previously consoli...
text
9.47
perShareItemType
text: <entity> 9.47 </entity> <entity type> perShareItemType </entity type> <context> In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per...
us-gaap:SharesIssuedPricePerShare
In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per share, for a total value of approximately $ 7,800 . As the Company previously consoli...
text
7800
monetaryItemType
text: <entity> 7800 </entity> <entity type> monetaryItemType </entity type> <context> In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per...
us-gaap:ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent
In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per share, for a total value of approximately $ 7,800 . As the Company previously consoli...
text
3344
monetaryItemType
text: <entity> 3344 </entity> <entity type> monetaryItemType </entity type> <context> In 2023, the Company purchased the remaining 0.925 % noncontrolling interest in Lepercq Corporate Income Fund L.P. (“LCIF”) consisting of 730,623.5 LCIF operating partnership (“OP”) units by issuing 822,627 common shares at $ 9.47 per...
us-gaap:MinorityInterestDecreaseFromRedemptions
The Company operates in one operating segment, focused on single-tenant real estate assets.
text
one
integerItemType
text: <entity> one </entity> <entity type> integerItemType </entity type> <context> The Company operates in one operating segment, focused on single-tenant real estate assets. </context>
us-gaap:NumberOfOperatingSegments
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
209172
monetaryItemType
text: <entity> 209172 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 ...
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
191332
monetaryItemType
text: <entity> 191332 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 ...
us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
25126
monetaryItemType
text: <entity> 25126 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 i...
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
21518
monetaryItemType
text: <entity> 21518 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 i...
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
15964
monetaryItemType
text: <entity> 15964 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 i...
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
11879
monetaryItemType
text: <entity> 11879 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 i...
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 in 2025, $ 21,518 in 2026, $ 15,964 in 2027, $ 11,879 in 2028 and $ 10,737 in 2029.
text
10737
monetaryItemType
text: <entity> 10737 </entity> <entity type> monetaryItemType </entity type> <context> Includes accumulated amortization of real estate intangible assets of $ 209,172 and $ 191,332 in 2024 and 2023, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $ 25,126 i...
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $ 6,722 and $ 9,385 , respectively, as of December 31, 2024 and 2023. The estimated accretion for the next five years:
text
6722
monetaryItemType
text: <entity> 6722 </entity> <entity type> monetaryItemType </entity type> <context> The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $ 6,722 and $ 9,385 , respectively, as of December 31, 2024 and 2023. The estimated accretion for the next five years: </con...
us-gaap:BelowMarketLeaseNet
The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $ 6,722 and $ 9,385 , respectively, as of December 31, 2024 and 2023. The estimated accretion for the next five years:
text
9385
monetaryItemType
text: <entity> 9385 </entity> <entity type> monetaryItemType </entity type> <context> The Company had below-market leases, net of accumulated accretion, which are included in deferred revenue, of $ 6,722 and $ 9,385 , respectively, as of December 31, 2024 and 2023. The estimated accretion for the next five years: </con...
us-gaap:BelowMarketLeaseNet