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As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of credit and $ 20.0 million outstanding draws under our lines of credit as of December 3...
text
16.2
monetaryItemType
text: <entity> 16.2 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of ...
us-gaap:LettersOfCreditOutstandingAmount
As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of credit and $ 20.0 million outstanding draws under our lines of credit as of December 3...
text
20.0
monetaryItemType
text: <entity> 20.0 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of ...
us-gaap:LinesOfCreditCurrent
As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of credit and $ 20.0 million outstanding draws under our lines of credit as of December 3...
text
19.4
monetaryItemType
text: <entity> 19.4 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of ...
us-gaap:LettersOfCreditOutstandingAmount
As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of credit and $ 20.0 million outstanding draws under our lines of credit as of December 3...
text
34.1
monetaryItemType
text: <entity> 34.1 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had consolidated bank lines of credit aggregating to $ 362.0 million ($ 423.1 million as of December 31, 2023), most of which expire in January 2027. We had $ 16.2 million outstanding in standby letters of ...
us-gaap:LinesOfCreditCurrent
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
1704.7
monetaryItemType
text: <entity> 1704.7 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturi...
us-gaap:LongTermDebtNoncurrent
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
1679.9
monetaryItemType
text: <entity> 1679.9 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturi...
us-gaap:LongTermDebtNoncurrent
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
8.6
monetaryItemType
text: <entity> 8.6 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing ...
us-gaap:DeferredFinanceCostsNoncurrentNet
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
94.7
monetaryItemType
text: <entity> 94.7 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing...
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
80.2
monetaryItemType
text: <entity> 80.2 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing...
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
182.5
monetaryItemType
text: <entity> 182.5 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturin...
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
55.8
monetaryItemType
text: <entity> 55.8 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing...
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
220.3
monetaryItemType
text: <entity> 220.3 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturin...
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturing in 2025 is $ 94.7 million; $ 80.2 million in 2026; $ 182.5 million in 2027; $ 55.8 mi...
text
1174.5
monetaryItemType
text: <entity> 1174.5 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total long-term debt outstanding was $ 1,704.7 million ($ 1,679.9 million as of December 31, 2023) and included $ 8.6 million of unamortized debt issuance costs. The aggregate amount of long-term debt maturi...
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Minnesota Power is obligated to make financing payments for the Camp Ripley solar array totaling $ 1.4 million annually during the financing term, which expires in 2027. Minnesota Power has the option at the end of the financing term to renew for a two -year term, or to purchase the solar array for approximately $ 4 mi...
text
1.4
monetaryItemType
text: <entity> 1.4 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power is obligated to make financing payments for the Camp Ripley solar array totaling $ 1.4 million annually during the financing term, which expires in 2027. Minnesota Power has the option at the end of the financing term t...
us-gaap:DebtInstrumentPeriodicPayment
On April 23, 2024, ALLETE issued $ 100 million of its First Mortgage Bonds (Bonds) to certain institutional buyers in the private placement market. The Bonds, which bear interest at 5.72 percent, will mature on April 30, 2039 and pay interest semi-annually in April and October of each year, commencing on October 30, 20...
text
100
monetaryItemType
text: <entity> 100 </entity> <entity type> monetaryItemType </entity type> <context> On April 23, 2024, ALLETE issued $ 100 million of its First Mortgage Bonds (Bonds) to certain institutional buyers in the private placement market. The Bonds, which bear interest at 5.72 percent, will mature on April 30, 2039 and pay i...
us-gaap:ProceedsFromIssuanceOfFirstMortgageBond
On April 23, 2024, ALLETE issued $ 100 million of its First Mortgage Bonds (Bonds) to certain institutional buyers in the private placement market. The Bonds, which bear interest at 5.72 percent, will mature on April 30, 2039 and pay interest semi-annually in April and October of each year, commencing on October 30, 20...
text
5.72
percentItemType
text: <entity> 5.72 </entity> <entity type> percentItemType </entity type> <context> On April 23, 2024, ALLETE issued $ 100 million of its First Mortgage Bonds (Bonds) to certain institutional buyers in the private placement market. The Bonds, which bear interest at 5.72 percent, will mature on April 30, 2039 and pay i...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On July 31, 2024, ALLETE issued a notice to the holders of its 2.65 percent senior notes due September 10, 2025, (“2025 Notes”) regarding the Company’s exercise of its option to prepay all of the issued and outstanding 2025 Notes. ALLETE prepaid all $ 150 million in aggregate principal amount of the 2025 Notes on Septe...
text
2.65
percentItemType
text: <entity> 2.65 </entity> <entity type> percentItemType </entity type> <context> On July 31, 2024, ALLETE issued a notice to the holders of its 2.65 percent senior notes due September 10, 2025, (“2025 Notes”) regarding the Company’s exercise of its option to prepay all of the issued and outstanding 2025 Notes. ALLE...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On July 31, 2024, ALLETE issued a notice to the holders of its 2.65 percent senior notes due September 10, 2025, (“2025 Notes”) regarding the Company’s exercise of its option to prepay all of the issued and outstanding 2025 Notes. ALLETE prepaid all $ 150 million in aggregate principal amount of the 2025 Notes on Septe...
text
150
monetaryItemType
text: <entity> 150 </entity> <entity type> monetaryItemType </entity type> <context> On July 31, 2024, ALLETE issued a notice to the holders of its 2.65 percent senior notes due September 10, 2025, (“2025 Notes”) regarding the Company’s exercise of its option to prepay all of the issued and outstanding 2025 Notes. ALLE...
us-gaap:RepaymentsOfSeniorDebt
On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended, to institutional accredited i...
text
150
monetaryItemType
text: <entity> 150 </entity> <entity type> monetaryItemType </entity type> <context> On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Sec...
us-gaap:DebtInstrumentFaceAmount
On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended, to institutional accredited i...
text
100
monetaryItemType
text: <entity> 100 </entity> <entity type> monetaryItemType </entity type> <context> On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Sec...
us-gaap:DebtInstrumentFaceAmount
On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended, to institutional accredited i...
text
5.94
percentItemType
text: <entity> 5.94 </entity> <entity type> percentItemType </entity type> <context> On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Sec...
us-gaap:DebtInstrumentInterestRateStatedPercentage
On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended, to institutional accredited i...
text
50
monetaryItemType
text: <entity> 50 </entity> <entity type> monetaryItemType </entity type> <context> On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Sect...
us-gaap:DebtInstrumentFaceAmount
On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended, to institutional accredited i...
text
6.18
percentItemType
text: <entity> 6.18 </entity> <entity type> percentItemType </entity type> <context> On September 5, 2024, ALLETE issued and sold $ 150 million of senior unsecured notes (“Notes”) to certain institutional buyers in the private placement market. The Notes were sold in reliance on an exemption from registration under Sec...
us-gaap:DebtInstrumentInterestRateStatedPercentage
Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fired generating unit. Minnesota Power’s output entitlement under the Agreement is 50 per...
text
50
percentItemType
text: <entity> 50 </entity> <entity type> percentItemType </entity type> <context> Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fired ...
us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fired generating unit. Minnesota Power’s output entitlement under the Agreement is 50 per...
text
168.9
monetaryItemType
text: <entity> 168.9 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fi...
us-gaap:LongTermContractForPurchaseOfElectricPowerAmountOfLongTermDebtOrLeaseObligationOutstanding
Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fired generating unit. Minnesota Power’s output entitlement under the Agreement is 50 per...
text
30.6
monetaryItemType
text: <entity> 30.6 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fir...
us-gaap:LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired
Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fired generating unit. Minnesota Power’s output entitlement under the Agreement is 50 per...
text
32.1
monetaryItemType
text: <entity> 32.1 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power has a PPA with Square Butte that extends through 2026 (Agreement). Minnesota Power is obligated to pay its pro rata share of Square Butte’s costs based on its entitlement to the output of Square Butte’s 455 MW coal fir...
us-gaap:LongTermContractForPurchaseOfElectricPowerAnnualMinimumDebtServicePaymentRequired
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
87.7
monetaryItemType
text: <entity> 87.7 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 pe...
us-gaap:UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
86.2
monetaryItemType
text: <entity> 86.2 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 pe...
us-gaap:UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
82.7
monetaryItemType
text: <entity> 82.7 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 pe...
us-gaap:UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
50
percentItemType
text: <entity> 50 </entity> <entity type> percentItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 perce...
us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
4.9
monetaryItemType
text: <entity> 4.9 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 per...
us-gaap:LongTermContractForPurchaseOfElectricPowerInterestIncludedInContractCharges
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
5.5
monetaryItemType
text: <entity> 5.5 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 per...
us-gaap:LongTermContractForPurchaseOfElectricPowerInterestIncludedInContractCharges
Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 percent output entitlement. Included in this amount was Minnesota Power’s pro rata share...
text
5.1
monetaryItemType
text: <entity> 5.1 </entity> <entity type> monetaryItemType </entity type> <context> Minnesota Power’s cost of power purchased from Square Butte during 2024 was $ 87.7 million ($ 86.2 million in 2023; $ 82.7 million in 2022). This reflects Minnesota Power’s pro rata share of total Square Butte costs based on the 50 per...
us-gaap:LongTermContractForPurchaseOfElectricPowerInterestIncludedInContractCharges
Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is eliminated at the end of 2025. Of Minnesota Power’s 50 percent output entitlement, it so...
text
50
percentItemType
text: <entity> 50 </entity> <entity type> percentItemType </entity type> <context> Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is elimi...
us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is eliminated at the end of 2025. Of Minnesota Power’s 50 percent output entitlement, it so...
text
41
percentItemType
text: <entity> 41 </entity> <entity type> percentItemType </entity type> <context> Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is elimi...
us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is eliminated at the end of 2025. Of Minnesota Power’s 50 percent output entitlement, it so...
text
37
percentItemType
text: <entity> 37 </entity> <entity type> percentItemType </entity type> <context> Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is elimi...
us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is eliminated at the end of 2025. Of Minnesota Power’s 50 percent output entitlement, it so...
text
32
percentItemType
text: <entity> 32 </entity> <entity type> percentItemType </entity type> <context> Minnesota Power is selling a portion of its entitlement from Square Butte to Minnkota Power, resulting in Minnkota Power’s net entitlement increasing and Minnesota Power’s net entitlement decreasing until Minnesota Power’s share is elimi...
us-gaap:LongTermContractForPurchaseOfElectricPowerShareOfPlantOutputBeingPurchased
In 2015, the EPA published a final rule (2015 Rule) regulating CCR as nonhazardous waste under Subtitle D of the Resource Conservation and Recovery Act (RCRA) in the Federal Register. The rule included additional requirements for new landfill and impoundment construction as well as closure activities related to certain...
text
65
monetaryItemType
text: <entity> 65 </entity> <entity type> monetaryItemType </entity type> <context> In 2015, the EPA published a final rule (2015 Rule) regulating CCR as nonhazardous waste under Subtitle D of the Resource Conservation and Recovery Act (RCRA) in the Federal Register. The rule included additional requirements for new la...
us-gaap:SiteContingencyLossExposureNotAccruedBestEstimate
In 2015, the EPA published a final rule (2015 Rule) regulating CCR as nonhazardous waste under Subtitle D of the Resource Conservation and Recovery Act (RCRA) in the Federal Register. The rule included additional requirements for new landfill and impoundment construction as well as closure activities related to certain...
text
120
monetaryItemType
text: <entity> 120 </entity> <entity type> monetaryItemType </entity type> <context> In 2015, the EPA published a final rule (2015 Rule) regulating CCR as nonhazardous waste under Subtitle D of the Resource Conservation and Recovery Act (RCRA) in the Federal Register. The rule included additional requirements for new l...
us-gaap:SiteContingencyLossExposureNotAccruedBestEstimate
On May 8, 2024, the EPA's final CCR Legacy Impoundment Rule was published in the Federal Register. The final rule expands the scope of units regulated under the CCR rule to include legacy ponds (inactive surface impoundments at inactive facilities) and creates a new category of units called CCR management units (CCRMU)...
text
50
monetaryItemType
text: <entity> 50 </entity> <entity type> monetaryItemType </entity type> <context> On May 8, 2024, the EPA's final CCR Legacy Impoundment Rule was published in the Federal Register. The final rule expands the scope of units regulated under the CCR rule to include legacy ponds (inactive surface impoundments at inactive...
us-gaap:SiteContingencyLossExposureNotAccruedBestEstimate
On May 8, 2024, the EPA's final CCR Legacy Impoundment Rule was published in the Federal Register. The final rule expands the scope of units regulated under the CCR rule to include legacy ponds (inactive surface impoundments at inactive facilities) and creates a new category of units called CCR management units (CCRMU)...
text
85
monetaryItemType
text: <entity> 85 </entity> <entity type> monetaryItemType </entity type> <context> On May 8, 2024, the EPA's final CCR Legacy Impoundment Rule was published in the Federal Register. The final rule expands the scope of units regulated under the CCR rule to include legacy ponds (inactive surface impoundments at inactive...
us-gaap:SiteContingencyLossExposureNotAccruedBestEstimate
We have multiple credit facility agreements in place that provide the ability to issue standby letters of credit to satisfy our contractual security requirements across our businesses. As of December 31, 2024, we had $ 134.7 million of outstanding letters of credit issued, including those issued under our revolving cre...
text
134.7
monetaryItemType
text: <entity> 134.7 </entity> <entity type> monetaryItemType </entity type> <context> We have multiple credit facility agreements in place that provide the ability to issue standby letters of credit to satisfy our contractual security requirements across our businesses. As of December 31, 2024, we had $ 134.7 million ...
us-gaap:LettersOfCreditOutstandingAmount
We have multiple credit facility agreements in place that provide the ability to issue standby letters of credit to satisfy our contractual security requirements across our businesses. As of December 31, 2024, we had $ 134.7 million of outstanding letters of credit issued, including those issued under our revolving cre...
text
122.2
monetaryItemType
text: <entity> 122.2 </entity> <entity type> monetaryItemType </entity type> <context> We have multiple credit facility agreements in place that provide the ability to issue standby letters of credit to satisfy our contractual security requirements across our businesses. As of December 31, 2024, we had $ 134.7 million ...
us-gaap:LettersOfCreditOutstandingAmount
. As of December 31, 2024, BNI Energy had surety bonds outstanding of $ 88.8 million related to the reclamation liability for closing costs associated with its mine and mine facilities. Although its coal supply agreements obligate the customers to provide for the closing costs, additional assurance is required by feder...
text
82.1
monetaryItemType
text: <entity> 82.1 </entity> <entity type> monetaryItemType </entity type> <context> . As of December 31, 2024, BNI Energy had surety bonds outstanding of $ 88.8 million related to the reclamation liability for closing costs associated with its mine and mine facilities. Although its coal supply agreements obligate the...
us-gaap:GuaranteeObligationsMaximumExposure
. Nobles 2 wind energy facility requires standby letters of credit as security for certain contractual obligations. As of December 31, 2024, ALLETE South Wind has $ 10.1 million outstanding in standby letters of credit, related to our portion of the security requirements relative to our ownership in Nobles 2.
text
10.1
monetaryItemType
text: <entity> 10.1 </entity> <entity type> monetaryItemType </entity type> <context> . Nobles 2 wind energy facility requires standby letters of credit as security for certain contractual obligations. As of December 31, 2024, ALLETE South Wind has $ 10.1 million outstanding in standby letters of credit, related to our...
us-gaap:LettersOfCreditOutstandingAmount
. As of December 31, 2024, South Shore Energy had $ 29.7 million outstanding in standby letters of credit pledged as security in connection with the development of NTEC.
text
29.7
monetaryItemType
text: <entity> 29.7 </entity> <entity type> monetaryItemType </entity type> <context> . As of December 31, 2024, South Shore Energy had $ 29.7 million outstanding in standby letters of credit pledged as security in connection with the development of NTEC. </context>
us-gaap:LettersOfCreditOutstandingAmount
. As of December 31, 2024, ALLETE Properties had surety bonds outstanding to governmental entities totaling $ 2.0 million primarily related to development and maintenance obligations for various projects. The estimated cost of the remaining development work is $ 1.0 million. ALLETE Properties does not believe it is lik...
text
1.0
monetaryItemType
text: <entity> 1.0 </entity> <entity type> monetaryItemType </entity type> <context> . As of December 31, 2024, ALLETE Properties had surety bonds outstanding to governmental entities totaling $ 2.0 million primarily related to development and maintenance obligations for various projects. The estimated cost of the rema...
us-gaap:GuaranteeObligationsMaximumExposure
In 2005, the Town Center District issued $ 26.4 million of tax-exempt, 6.0 percent capital improvement revenue bonds. The capital improvement revenue bonds are payable over 31 years (by May 1, 2036) and are secured by special assessments on the benefited land. To the extent that ALLETE Properties still owns land at the...
text
26.4
monetaryItemType
text: <entity> 26.4 </entity> <entity type> monetaryItemType </entity type> <context> In 2005, the Town Center District issued $ 26.4 million of tax-exempt, 6.0 percent capital improvement revenue bonds. The capital improvement revenue bonds are payable over 31 years (by May 1, 2036) and are secured by special assessme...
us-gaap:FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
. In the first quarter of 2023, an ALLETE Clean Energy subsidiary initiated arbitration proceedings seeking damages against a counterparty for non-performance under a contract. Arbitration hearings were held in June and July 2023, and a final arbitration ruling was issued in favor of ALLETE Clean Energy’s subsidiary in...
text
60
monetaryItemType
text: <entity> 60 </entity> <entity type> monetaryItemType </entity type> <context> . In the first quarter of 2023, an ALLETE Clean Energy subsidiary initiated arbitration proceedings seeking damages against a counterparty for non-performance under a contract. Arbitration hearings were held in June and July 2023, and a...
us-gaap:ProceedsFromLegalSettlements
We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, of which 2.1 million shares remain available for issuance as of December 31, 2024. ...
text
no
sharesItemType
text: <entity> no </entity> <entity type> sharesItemType </entity type> <context> We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, o...
us-gaap:StockIssuedDuringPeriodSharesOther
We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, of which 2.1 million shares remain available for issuance as of December 31, 2024. ...
text
none
sharesItemType
text: <entity> none </entity> <entity type> sharesItemType </entity type> <context> We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value,...
us-gaap:StockIssuedDuringPeriodSharesOther
We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, of which 2.1 million shares remain available for issuance as of December 31, 2024. ...
text
3.7
sharesItemType
text: <entity> 3.7 </entity> <entity type> sharesItemType </entity type> <context> We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, ...
us-gaap:StockIssuedDuringPeriodSharesNewIssues
We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, of which 2.1 million shares remain available for issuance as of December 31, 2024. ...
text
224
monetaryItemType
text: <entity> 224 </entity> <entity type> monetaryItemType </entity type> <context> We entered into a distribution agreement with Lampert Capital Markets, in 2008, as amended most recently in 2020, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value...
us-gaap:StockIssuedDuringPeriodValueNewIssues
The effective tax rate was an expense of 3.7 percent for 2024 (expense of 13.5 percent for 2023; benefit of 31.2 percent for 2022). The 2024, 2023 and 2022 effective tax rates were primarily impacted by tax credits and non-controlling interests in subsidiaries.
text
3.7
percentItemType
text: <entity> 3.7 </entity> <entity type> percentItemType </entity type> <context> The effective tax rate was an expense of 3.7 percent for 2024 (expense of 13.5 percent for 2023; benefit of 31.2 percent for 2022). The 2024, 2023 and 2022 effective tax rates were primarily impacted by tax credits and non-controlling i...
us-gaap:EffectiveIncomeTaxRateContinuingOperations
The effective tax rate was an expense of 3.7 percent for 2024 (expense of 13.5 percent for 2023; benefit of 31.2 percent for 2022). The 2024, 2023 and 2022 effective tax rates were primarily impacted by tax credits and non-controlling interests in subsidiaries.
text
13.5
percentItemType
text: <entity> 13.5 </entity> <entity type> percentItemType </entity type> <context> The effective tax rate was an expense of 3.7 percent for 2024 (expense of 13.5 percent for 2023; benefit of 31.2 percent for 2022). The 2024, 2023 and 2022 effective tax rates were primarily impacted by tax credits and non-controlling ...
us-gaap:EffectiveIncomeTaxRateContinuingOperations
The effective tax rate was an expense of 3.7 percent for 2024 (expense of 13.5 percent for 2023; benefit of 31.2 percent for 2022). The 2024, 2023 and 2022 effective tax rates were primarily impacted by tax credits and non-controlling interests in subsidiaries.
text
31.2
percentItemType
text: <entity> 31.2 </entity> <entity type> percentItemType </entity type> <context> The effective tax rate was an expense of 3.7 percent for 2024 (expense of 13.5 percent for 2023; benefit of 31.2 percent for 2022). The 2024, 2023 and 2022 effective tax rates were primarily impacted by tax credits and non-controlling ...
us-gaap:EffectiveIncomeTaxRateContinuingOperations
Pre-tax amounts; state NOL carryforwards net of a $ 9.7 million valuation allowance.
text
9.7
monetaryItemType
text: <entity> 9.7 </entity> <entity type> monetaryItemType </entity type> <context> Pre-tax amounts; state NOL carryforwards net of a $ 9.7 million valuation allowance. </context>
us-gaap:OperatingLossCarryforwardsValuationAllowance
Net of a $ 42.3 million valuation allowance as of December 31, 2024 ($ 55.4 million as of December 31, 2023).
text
42.3
monetaryItemType
text: <entity> 42.3 </entity> <entity type> monetaryItemType </entity type> <context> Net of a $ 42.3 million valuation allowance as of December 31, 2024 ($ 55.4 million as of December 31, 2023). </context>
us-gaap:TaxCreditCarryforwardValuationAllowance
Net of a $ 42.3 million valuation allowance as of December 31, 2024 ($ 55.4 million as of December 31, 2023).
text
55.4
monetaryItemType
text: <entity> 55.4 </entity> <entity type> monetaryItemType </entity type> <context> Net of a $ 42.3 million valuation allowance as of December 31, 2024 ($ 55.4 million as of December 31, 2023). </context>
us-gaap:TaxCreditCarryforwardValuationAllowance
The federal tax credit carryforward periods expire between 2035 and 2044. We expect to fully utilize the tax credit carryforwards; therefore, no federal valuation allowance has been recognized as of December 31, 2024. The apportioned state NOL, capital loss and tax credit carryforward periods expire between 2025 and 20...
text
no
monetaryItemType
text: <entity> no </entity> <entity type> monetaryItemType </entity type> <context> The federal tax credit carryforward periods expire between 2035 and 2044. We expect to fully utilize the tax credit carryforwards; therefore, no federal valuation allowance has been recognized as of December 31, 2024. The apportioned st...
us-gaap:OperatingLossCarryforwardsValuationAllowance
Unrecognized tax benefits are the differences between a tax position taken or expected to be taken in a tax return and the benefit recognized and measured pursuant to the “more-likely-than-not” criteria. The unrecognized tax benefit balance includes permanent tax positions which, if recognized, would affect the annual ...
text
0.6
monetaryItemType
text: <entity> 0.6 </entity> <entity type> monetaryItemType </entity type> <context> Unrecognized tax benefits are the differences between a tax position taken or expected to be taken in a tax return and the benefit recognized and measured pursuant to the “more-likely-than-not” criteria. The unrecognized tax benefit ba...
us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
As of December 31, 2024, we had accrued interest of $ 0.2 million ($ 0.1 million as of December 31, 2023; none as of December 31, 2022) related to unrecognized tax benefits included on the Consolidated Balance Sheet due to our NOL carryforwards. We classify interest related to unrecognized tax benefits as interest expe...
text
0.2
monetaryItemType
text: <entity> 0.2 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had accrued interest of $ 0.2 million ($ 0.1 million as of December 31, 2023; none as of December 31, 2022) related to unrecognized tax benefits included on the Consolidated Balance Sheet due to our NOL carr...
us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
As of December 31, 2024, we had accrued interest of $ 0.2 million ($ 0.1 million as of December 31, 2023; none as of December 31, 2022) related to unrecognized tax benefits included on the Consolidated Balance Sheet due to our NOL carryforwards. We classify interest related to unrecognized tax benefits as interest expe...
text
0.1
monetaryItemType
text: <entity> 0.1 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had accrued interest of $ 0.2 million ($ 0.1 million as of December 31, 2023; none as of December 31, 2022) related to unrecognized tax benefits included on the Consolidated Balance Sheet due to our NOL carr...
us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
As of December 31, 2024, we had accrued interest of $ 0.2 million ($ 0.1 million as of December 31, 2023; none as of December 31, 2022) related to unrecognized tax benefits included on the Consolidated Balance Sheet due to our NOL carryforwards. We classify interest related to unrecognized tax benefits as interest expe...
text
none
monetaryItemType
text: <entity> none </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, we had accrued interest of $ 0.2 million ($ 0.1 million as of December 31, 2023; none as of December 31, 2022) related to unrecognized tax benefits included on the Consolidated Balance Sheet due to our NOL car...
us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
No material changes to unrecognized tax benefits are expected during the next 12 months.
text
No
monetaryItemType
text: <entity> No </entity> <entity type> monetaryItemType </entity type> <context> No material changes to unrecognized tax benefits are expected during the next 12 months. </context>
us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
We have noncontributory union, non-union and combined retiree defined benefit pension plans covering eligible employees. The combined retiree defined benefit pension plan was created in 2016, to include all union and non-union retirees from the existing plans as of January 2016. The plans provide defined benefits based...
text
15.7
monetaryItemType
text: <entity> 15.7 </entity> <entity type> monetaryItemType </entity type> <context> We have noncontributory union, non-union and combined retiree defined benefit pension plans covering eligible employees. The combined retiree defined benefit pension plan was created in 2016, to include all union and non-union retiree...
us-gaap:EmployeeStockOwnershipPlanESOPCompensationExpense
We have noncontributory union, non-union and combined retiree defined benefit pension plans covering eligible employees. The combined retiree defined benefit pension plan was created in 2016, to include all union and non-union retirees from the existing plans as of January 2016. The plans provide defined benefits based...
text
13.7
monetaryItemType
text: <entity> 13.7 </entity> <entity type> monetaryItemType </entity type> <context> We have noncontributory union, non-union and combined retiree defined benefit pension plans covering eligible employees. The combined retiree defined benefit pension plan was created in 2016, to include all union and non-union retiree...
us-gaap:EmployeeStockOwnershipPlanESOPCompensationExpense
We have noncontributory union, non-union and combined retiree defined benefit pension plans covering eligible employees. The combined retiree defined benefit pension plan was created in 2016, to include all union and non-union retirees from the existing plans as of January 2016. The plans provide defined benefits based...
text
12.0
monetaryItemType
text: <entity> 12.0 </entity> <entity type> monetaryItemType </entity type> <context> We have noncontributory union, non-union and combined retiree defined benefit pension plans covering eligible employees. The combined retiree defined benefit pension plan was created in 2016, to include all union and non-union retiree...
us-gaap:EmployeeStockOwnershipPlanESOPCompensationExpense
We have postretirement health care and life insurance plans covering eligible employees. In 2010, the postretirement health care plan was closed to employees hired after January 2011, and the eligibility requirements were amended. The postretirement life plan was amended in 2014 to close the plan to non-union employees...
text
no
monetaryItemType
text: <entity> no </entity> <entity type> monetaryItemType </entity type> <context> We have postretirement health care and life insurance plans covering eligible employees. In 2010, the postretirement health care plan was closed to employees hired after January 2011, and the eligibility requirements were amended. The p...
us-gaap:PensionAndOtherPostretirementBenefitContributions
We have postretirement health care and life insurance plans covering eligible employees. In 2010, the postretirement health care plan was closed to employees hired after January 2011, and the eligibility requirements were amended. The postretirement life plan was amended in 2014 to close the plan to non-union employees...
text
none
monetaryItemType
text: <entity> none </entity> <entity type> monetaryItemType </entity type> <context> We have postretirement health care and life insurance plans covering eligible employees. In 2010, the postretirement health care plan was closed to employees hired after January 2011, and the eligibility requirements were amended. The...
us-gaap:PensionAndOtherPostretirementBenefitContributions
Management considers various factors when making funding decisions such as regulatory requirements, actuarially determined minimum contribution requirements and contributions required to avoid benefit restrictions for the pension plans. Contributions are based on estimates and assumptions which are subject to change. O...
text
19.1
monetaryItemType
text: <entity> 19.1 </entity> <entity type> monetaryItemType </entity type> <context> Management considers various factors when making funding decisions such as regulatory requirements, actuarially determined minimum contribution requirements and contributions required to avoid benefit restrictions for the pension plan...
us-gaap:DefinedBenefitPlanContributionsByEmployer
Management considers various factors when making funding decisions such as regulatory requirements, actuarially determined minimum contribution requirements and contributions required to avoid benefit restrictions for the pension plans. Contributions are based on estimates and assumptions which are subject to change. O...
text
not
monetaryItemType
text: <entity> not </entity> <entity type> monetaryItemType </entity type> <context> Management considers various factors when making funding decisions such as regulatory requirements, actuarially determined minimum contribution requirements and contributions required to avoid benefit restrictions for the pension plans...
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Management considers various factors when making funding decisions such as regulatory requirements, actuarially determined minimum contribution requirements and contributions required to avoid benefit restrictions for the pension plans. Contributions are based on estimates and assumptions which are subject to change. O...
text
no
monetaryItemType
text: <entity> no </entity> <entity type> monetaryItemType </entity type> <context> Management considers various factors when making funding decisions such as regulatory requirements, actuarially determined minimum contribution requirements and contributions required to avoid benefit restrictions for the pension plans....
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
The pension costs that are reported as a component within the Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist primarily of a net loss of $ 235.2 million as of December 31, 2024 (net loss of $ 256.9 million as of December 31, 2023).
text
235.2
monetaryItemType
text: <entity> 235.2 </entity> <entity type> monetaryItemType </entity type> <context> The pension costs that are reported as a component within the Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist primarily of a net loss of $ 235.2 ...
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
The pension costs that are reported as a component within the Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist primarily of a net loss of $ 235.2 million as of December 31, 2024 (net loss of $ 256.9 million as of December 31, 2023).
text
256.9
monetaryItemType
text: <entity> 256.9 </entity> <entity type> monetaryItemType </entity type> <context> The pension costs that are reported as a component within the Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist primarily of a net loss of $ 235.2 ...
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
According to the accounting standards for retirement benefits, only assets in the VEBAs are treated as plan assets in the preceding table for the purpose of determining funded status. In addition to the postretirement health and life assets reported in the previous table, we had $ 13.4 million in irrevocable grantor tr...
text
13.4
monetaryItemType
text: <entity> 13.4 </entity> <entity type> monetaryItemType </entity type> <context> According to the accounting standards for retirement benefits, only assets in the VEBAs are treated as plan assets in the preceding table for the purpose of determining funded status. In addition to the postretirement health and life ...
us-gaap:LongTermInvestments
According to the accounting standards for retirement benefits, only assets in the VEBAs are treated as plan assets in the preceding table for the purpose of determining funded status. In addition to the postretirement health and life assets reported in the previous table, we had $ 13.4 million in irrevocable grantor tr...
text
12.8
monetaryItemType
text: <entity> 12.8 </entity> <entity type> monetaryItemType </entity type> <context> According to the accounting standards for retirement benefits, only assets in the VEBAs are treated as plan assets in the preceding table for the purpose of determining funded status. In addition to the postretirement health and life ...
us-gaap:LongTermInvestments
There were no shares of ALLETE common stock included in pension plan equity securities as of December 31, 2024 ( no shares as of December 31, 2023).
text
no
sharesItemType
text: <entity> no </entity> <entity type> sharesItemType </entity type> <context> There were no shares of ALLETE common stock included in pension plan equity securities as of December 31, 2024 ( no shares as of December 31, 2023). </context>
us-gaap:DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets
We sponsor an ESOP within the RSOP. Eligible employees may contribute to the RSOP plan as of their date of hire. The dividends received by the ESOP are distributed to participants. Dividends on allocated ESOP shares are recorded as a reduction of retained earnings. ESOP employer allocations are funded with contribution...
text
15.7
monetaryItemType
text: <entity> 15.7 </entity> <entity type> monetaryItemType </entity type> <context> We sponsor an ESOP within the RSOP. Eligible employees may contribute to the RSOP plan as of their date of hire. The dividends received by the ESOP are distributed to participants. Dividends on allocated ESOP shares are recorded as a ...
us-gaap:EmployeeStockOwnershipPlanESOPCompensationExpense
We sponsor an ESOP within the RSOP. Eligible employees may contribute to the RSOP plan as of their date of hire. The dividends received by the ESOP are distributed to participants. Dividends on allocated ESOP shares are recorded as a reduction of retained earnings. ESOP employer allocations are funded with contribution...
text
13.7
monetaryItemType
text: <entity> 13.7 </entity> <entity type> monetaryItemType </entity type> <context> We sponsor an ESOP within the RSOP. Eligible employees may contribute to the RSOP plan as of their date of hire. The dividends received by the ESOP are distributed to participants. Dividends on allocated ESOP shares are recorded as a ...
us-gaap:EmployeeStockOwnershipPlanESOPCompensationExpense
We sponsor an ESOP within the RSOP. Eligible employees may contribute to the RSOP plan as of their date of hire. The dividends received by the ESOP are distributed to participants. Dividends on allocated ESOP shares are recorded as a reduction of retained earnings. ESOP employer allocations are funded with contribution...
text
12.0
monetaryItemType
text: <entity> 12.0 </entity> <entity type> monetaryItemType </entity type> <context> We sponsor an ESOP within the RSOP. Eligible employees may contribute to the RSOP plan as of their date of hire. The dividends received by the ESOP are distributed to participants. Dividends on allocated ESOP shares are recorded as a ...
us-gaap:EmployeeStockOwnershipPlanESOPCompensationExpense
Under our Executive Long-Term Incentive Compensation Plan (Executive Plan), share-based awards may be issued to key employees through a broad range of methods, including non-qualified and incentive stock options, performance shares, performance units, restricted stock, restricted stock units, stock appreciation rights ...
text
0.7
sharesItemType
text: <entity> 0.7 </entity> <entity type> sharesItemType </entity type> <context> Under our Executive Long-Term Incentive Compensation Plan (Executive Plan), share-based awards may be issued to key employees through a broad range of methods, including non-qualified and incentive stock options, performance shares, perf...
us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
Under our Executive Long-Term Incentive Compensation Plan (Executive Plan), share-based awards may be issued to key employees through a broad range of methods, including non-qualified and incentive stock options, performance shares, performance units, restricted stock, restricted stock units, stock appreciation rights ...
text
0.5
sharesItemType
text: <entity> 0.5 </entity> <entity type> sharesItemType </entity type> <context> Under our Executive Long-Term Incentive Compensation Plan (Executive Plan), share-based awards may be issued to key employees through a broad range of methods, including non-qualified and incentive stock options, performance shares, perf...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Under our ESPP, eligible employees may purchase ALLETE common stock at a 5 percent discount from the market price; we are not required to apply fair value accounting to these awards as the discount is not greater than 5 percent.
text
5
percentItemType
text: <entity> 5 </entity> <entity type> percentItemType </entity type> <context> Under our ESPP, eligible employees may purchase ALLETE common stock at a 5 percent discount from the market price; we are not required to apply fair value accounting to these awards as the discount is not greater than 5 percent. </context...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
As of December 31, 2024, the total unrecognized compensation cost for the performance share awards and restricted stock units not yet recognized in our Consolidated Statement of Income was $ 3.3 million and $ 1.1 million, respectively. These amounts are expected to be recognized over a weighted-average period of 1.7 ye...
text
3.3
monetaryItemType
text: <entity> 3.3 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, the total unrecognized compensation cost for the performance share awards and restricted stock units not yet recognized in our Consolidated Statement of Income was $ 3.3 million and $ 1.1 million, respectively....
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
As of December 31, 2024, the total unrecognized compensation cost for the performance share awards and restricted stock units not yet recognized in our Consolidated Statement of Income was $ 3.3 million and $ 1.1 million, respectively. These amounts are expected to be recognized over a weighted-average period of 1.7 ye...
text
1.1
monetaryItemType
text: <entity> 1.1 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, the total unrecognized compensation cost for the performance share awards and restricted stock units not yet recognized in our Consolidated Statement of Income was $ 3.3 million and $ 1.1 million, respectively....
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
There were approximately 65,300 performance shares granted in January 2025 for the three -year performance period ending in 2027. The ultimate issuance is contingent upon the attainment of certain goals of ALLETE during the performance periods. The grant date fair value of the performance shares granted was $ 4.6 milli...
text
65300
sharesItemType
text: <entity> 65300 </entity> <entity type> sharesItemType </entity type> <context> There were approximately 65,300 performance shares granted in January 2025 for the three -year performance period ending in 2027. The ultimate issuance is contingent upon the attainment of certain goals of ALLETE during the performance...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
There were approximately 65,300 performance shares granted in January 2025 for the three -year performance period ending in 2027. The ultimate issuance is contingent upon the attainment of certain goals of ALLETE during the performance periods. The grant date fair value of the performance shares granted was $ 4.6 milli...
text
14200
sharesItemType
text: <entity> 14200 </entity> <entity type> sharesItemType </entity type> <context> There were approximately 65,300 performance shares granted in January 2025 for the three -year performance period ending in 2027. The ultimate issuance is contingent upon the attainment of certain goals of ALLETE during the performance...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
There were approximately 65,300 performance shares granted in January 2025 for the three -year performance period ending in 2027. The ultimate issuance is contingent upon the attainment of certain goals of ALLETE during the performance periods. The grant date fair value of the performance shares granted was $ 4.6 milli...
text
1.0
monetaryItemType
text: <entity> 1.0 </entity> <entity type> monetaryItemType </entity type> <context> There were approximately 65,300 performance shares granted in January 2025 for the three -year performance period ending in 2027. The ultimate issuance is contingent upon the attainment of certain goals of ALLETE during the performance...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
There were approximately 25,900 restricted stock units granted in January 2025 for the vesting period ending in 2027. The grant date fair value of the restricted stock units granted was $ 1.7 million. There were approximately 12,300 restricted stock units awarded in February 2025. The grant date fair value of the share...
text
25900
sharesItemType
text: <entity> 25900 </entity> <entity type> sharesItemType </entity type> <context> There were approximately 25,900 restricted stock units granted in January 2025 for the vesting period ending in 2027. The grant date fair value of the restricted stock units granted was $ 1.7 million. There were approximately 12,300 re...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
There were approximately 25,900 restricted stock units granted in January 2025 for the vesting period ending in 2027. The grant date fair value of the restricted stock units granted was $ 1.7 million. There were approximately 12,300 restricted stock units awarded in February 2025. The grant date fair value of the share...
text
12300
sharesItemType
text: <entity> 12300 </entity> <entity type> sharesItemType </entity type> <context> There were approximately 25,900 restricted stock units granted in January 2025 for the vesting period ending in 2027. The grant date fair value of the restricted stock units granted was $ 1.7 million. There were approximately 12,300 re...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
There were approximately 25,900 restricted stock units granted in January 2025 for the vesting period ending in 2027. The grant date fair value of the restricted stock units granted was $ 1.7 million. There were approximately 12,300 restricted stock units awarded in February 2025. The grant date fair value of the share...
text
0.8
monetaryItemType
text: <entity> 0.8 </entity> <entity type> monetaryItemType </entity type> <context> There were approximately 25,900 restricted stock units granted in January 2025 for the vesting period ending in 2027. The grant date fair value of the restricted stock units granted was $ 1.7 million. There were approximately 12,300 re...
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Regulated Operations includes three operating segments which consist of our regulated utilities, Minnesota Power and SWL&P, as well as our investment in ATC. ALLETE Clean Energy is our business focused on developing, acquiring and operating clean and renewable energy projects. We also present Corporate and Other which ...
text
three
integerItemType
text: <entity> three </entity> <entity type> integerItemType </entity type> <context> Regulated Operations includes three operating segments which consist of our regulated utilities, Minnesota Power and SWL&P, as well as our investment in ATC. ALLETE Clean Energy is our business focused on developing, acquiring and ope...
us-gaap:NumberOfOperatingSegments
(d)    Net Income in 2022 includes a $ 8.3 million after-tax expense as a result of purchase price accounting related to projects under development at the time of acquisition and $ 2.7 million after-tax of transaction costs related to the acquisition of New Energy.
text
2.7
monetaryItemType
text: <entity> 2.7 </entity> <entity type> monetaryItemType </entity type> <context> (d)    Net Income in 2022 includes a $ 8.3 million after-tax expense as a result of purchase price accounting related to projects under development at the time of acquisition and $ 2.7 million after-tax of transaction costs related to ...
us-gaap:BusinessCombinationAcquisitionRelatedCosts
(e)    Net income in 2024 includes transaction expenses of $ 22.6 million after-tax related to the Merger. (See Note 15. Agreement and Plan of Merger.)
text
22.6
monetaryItemType
text: <entity> 22.6 </entity> <entity type> monetaryItemType </entity type> <context> (e)    Net income in 2024 includes transaction expenses of $ 22.6 million after-tax related to the Merger. (See Note 15. Agreement and Plan of Merger.) </context>
us-gaap:BusinessCombinationAcquisitionRelatedCosts
Subject to the terms and conditions set forth in the Merger Agreement, which has been unanimously approved by the board of directors of ALLETE and approved and adopted by the shareholders of ALLETE, at the effective time of the Merger (Effective Time), each share of common stock, without par value, of ALLETE (ALLETE co...
text
67.00
perShareItemType
text: <entity> 67.00 </entity> <entity type> perShareItemType </entity type> <context> Subject to the terms and conditions set forth in the Merger Agreement, which has been unanimously approved by the board of directors of ALLETE and approved and adopted by the shareholders of ALLETE, at the effective time of the Merge...
us-gaap:BusinessAcquisitionSharePrice
Subject to the terms and conditions set forth in the Merger Agreement, which has been unanimously approved by the board of directors of ALLETE and approved and adopted by the shareholders of ALLETE, at the effective time of the Merger (Effective Time), each share of common stock, without par value, of ALLETE (ALLETE co...
text
3.9
monetaryItemType
text: <entity> 3.9 </entity> <entity type> monetaryItemType </entity type> <context> Subject to the terms and conditions set forth in the Merger Agreement, which has been unanimously approved by the board of directors of ALLETE and approved and adopted by the shareholders of ALLETE, at the effective time of the Merger ...
us-gaap:BusinessCombinationConsiderationTransferred1
The Merger Agreement contains certain termination rights for ALLETE and Alloy Parent, which were described in a Current Report of Form 8-K filed by ALLETE on May 6, 2024. In the Merger Agreement, among other things, ALLETE has agreed, subject to certain exceptions, to, and to cause each of its subsidiaries to conduct i...
text
300
monetaryItemType
text: <entity> 300 </entity> <entity type> monetaryItemType </entity type> <context> The Merger Agreement contains certain termination rights for ALLETE and Alloy Parent, which were described in a Current Report of Form 8-K filed by ALLETE on May 6, 2024. In the Merger Agreement, among other things, ALLETE has agreed, ...
us-gaap:BusinessCombinationContingentConsiderationAsset
Advertising costs are expensed as incurred and totaled $ 1,286,000 in 2024, $ 1,190,000 in 2023, and $ 1,257,000 in 2022.
text
1286000
monetaryItemType
text: <entity> 1286000 </entity> <entity type> monetaryItemType </entity type> <context> Advertising costs are expensed as incurred and totaled $ 1,286,000 in 2024, $ 1,190,000 in 2023, and $ 1,257,000 in 2022. </context>
us-gaap:AdvertisingExpense