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On April 15, 2022, a wholly-owned subsidiary of ALLETE acquired 100 percent of the membership interests of New Energy for a purchase price of $ 165.5 million. Total consideration of approximately $ 158.8 million was paid in cash on the acquisition date, which is net of cash acquired and debt assumed. New Energy, which ... | text | 100 | percentItemType | text: <entity> 100 </entity> <entity type> percentItemType </entity type> <context> On April 15, 2022, a wholly-owned subsidiary of ALLETE acquired 100 percent of the membership interests of New Energy for a purchase price of $ 165.5 million. Total consideration of approximately $ 158.8 million was paid in cash on the ... | us-gaap:BusinessAcquisitionPercentageOfVotingInterestsAcquired |
On April 15, 2022, a wholly-owned subsidiary of ALLETE acquired 100 percent of the membership interests of New Energy for a purchase price of $ 165.5 million. Total consideration of approximately $ 158.8 million was paid in cash on the acquisition date, which is net of cash acquired and debt assumed. New Energy, which ... | text | 158.8 | monetaryItemType | text: <entity> 158.8 </entity> <entity type> monetaryItemType </entity type> <context> On April 15, 2022, a wholly-owned subsidiary of ALLETE acquired 100 percent of the membership interests of New Energy for a purchase price of $ 165.5 million. Total consideration of approximately $ 158.8 million was paid in cash on t... | us-gaap:BusinessCombinationConsiderationTransferred1 |
For tax purpose, the purchase price allocation resulted in $ 154.9 million of deductible goodwill. | text | 154.9 | monetaryItemType | text: <entity> 154.9 </entity> <entity type> monetaryItemType </entity type> <context> For tax purpose, the purchase price allocation resulted in $ 154.9 million of deductible goodwill. </context> | us-gaap:BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount |
Acquisition-related costs were $ 2.7 million after-tax, expensed as incurred during 2022 and recorded in Operating and Maintenance on the Consolidated Statement of Income. | text | 2.7 | monetaryItemType | text: <entity> 2.7 </entity> <entity type> monetaryItemType </entity type> <context> Acquisition-related costs were $ 2.7 million after-tax, expensed as incurred during 2022 and recorded in Operating and Maintenance on the Consolidated Statement of Income. </context> | us-gaap:BusinessCombinationAcquisitionRelatedCosts |
Our wholly-owned subsidiary, ALLETE Transmission Holdings, owns approximately 8 percent of ATC, a Wisconsin-based utility that owns and maintains electric transmission assets in portions of Wisconsin, Michigan, Minnesota and Illinois. We account for our investment in ATC under the equity method of accounting. In 2024, ... | text | 8 | percentItemType | text: <entity> 8 </entity> <entity type> percentItemType </entity type> <context> Our wholly-owned subsidiary, ALLETE Transmission Holdings, owns approximately 8 percent of ATC, a Wisconsin-based utility that owns and maintains electric transmission assets in portions of Wisconsin, Michigan, Minnesota and Illinois. We ... | us-gaap:EquityMethodInvestmentOwnershipPercentage |
Our wholly-owned subsidiary, ALLETE Transmission Holdings, owns approximately 8 percent of ATC, a Wisconsin-based utility that owns and maintains electric transmission assets in portions of Wisconsin, Michigan, Minnesota and Illinois. We account for our investment in ATC under the equity method of accounting. In 2024, ... | text | 5.8 | monetaryItemType | text: <entity> 5.8 </entity> <entity type> monetaryItemType </entity type> <context> Our wholly-owned subsidiary, ALLETE Transmission Holdings, owns approximately 8 percent of ATC, a Wisconsin-based utility that owns and maintains electric transmission assets in portions of Wisconsin, Michigan, Minnesota and Illinois. ... | us-gaap:PaymentsToAcquireEquityMethodInvestments |
Our subsidiary, ALLETE South Wind, owns a 49 percent equity interest in Nobles 2, the entity that owns and operates a 250 MW wind energy facility in southwestern Minnesota pursuant to a 20 -year PPA with Minnesota Power. We account for our investment in Nobles 2 under the equity method of accounting. | text | 49 | percentItemType | text: <entity> 49 </entity> <entity type> percentItemType </entity type> <context> Our subsidiary, ALLETE South Wind, owns a 49 percent equity interest in Nobles 2, the entity that owns and operates a 250 MW wind energy facility in southwestern Minnesota pursuant to a 20 -year PPA with Minnesota Power. We account for o... | us-gaap:EquityMethodInvestmentOwnershipPercentage |
The Company also recorded net loss attributable to non-controlling interest of $ 11.7 million related to its investment in Nobles 2. | text | 11.7 | monetaryItemType | text: <entity> 11.7 </entity> <entity type> monetaryItemType </entity type> <context> The Company also recorded net loss attributable to non-controlling interest of $ 11.7 million related to its investment in Nobles 2. </context> | us-gaap:NetIncomeLossAttributableToNoncontrollingInterest |
As of December 31, 2024, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $ 2.0 million, in one year to less than three years was $ 2.8 million, in three years to less than five years was $ 1.5 million and in five or more years was $ 0.5 million. | text | 2.0 | monetaryItemType | text: <entity> 2.0 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $ 2.0 million, in one year to less than three years was $ 2.8 million, in three years to le... | us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
The aggregate carrying amount of our equity investments was $ 340.1 million as of December 31, 2024 ($ 331.2 million as of December 31, 2023). The Company assesses our equity investments in ATC and Nobles 2 for impairment whenever events or changes in circumstances indicate that the carrying amount of our investments m... | text | 340.1 | monetaryItemType | text: <entity> 340.1 </entity> <entity type> monetaryItemType </entity type> <context> The aggregate carrying amount of our equity investments was $ 340.1 million as of December 31, 2024 ($ 331.2 million as of December 31, 2023). The Company assesses our equity investments in ATC and Nobles 2 for impairment whenever ev... | us-gaap:EquityMethodInvestments |
The aggregate carrying amount of our equity investments was $ 340.1 million as of December 31, 2024 ($ 331.2 million as of December 31, 2023). The Company assesses our equity investments in ATC and Nobles 2 for impairment whenever events or changes in circumstances indicate that the carrying amount of our investments m... | text | 331.2 | monetaryItemType | text: <entity> 331.2 </entity> <entity type> monetaryItemType </entity type> <context> The aggregate carrying amount of our equity investments was $ 340.1 million as of December 31, 2024 ($ 331.2 million as of December 31, 2023). The Company assesses our equity investments in ATC and Nobles 2 for impairment whenever ev... | us-gaap:EquityMethodInvestments |
The Company assesses the impairment of goodwill annually in the fourth quarter and whenever an event occurs or circumstances change that would indicate that the carrying amount may be impaired. The Company’s goodwill is a result of the New Energy acquisition in 2022. (See Note 1. Operations and Significant Accounting P... | text | 154.9 | monetaryItemType | text: <entity> 154.9 </entity> <entity type> monetaryItemType </entity type> <context> The Company assesses the impairment of goodwill annually in the fourth quarter and whenever an event occurs or circumstances change that would indicate that the carrying amount may be impaired. The Company’s goodwill is a result of t... | us-gaap:Goodwill |
As of December 31, 2024, total short-term debt outstanding was $ 94.7 million ($ 111.4 million as of December 31, 2023), and consisted of long-term debt due within one year and included no unamortized debt issuance costs. | text | 94.7 | monetaryItemType | text: <entity> 94.7 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total short-term debt outstanding was $ 94.7 million ($ 111.4 million as of December 31, 2023), and consisted of long-term debt due within one year and included no unamortized debt issuance costs. </context> | us-gaap:DebtCurrent |
As of December 31, 2024, total short-term debt outstanding was $ 94.7 million ($ 111.4 million as of December 31, 2023), and consisted of long-term debt due within one year and included no unamortized debt issuance costs. | text | 111.4 | monetaryItemType | text: <entity> 111.4 </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total short-term debt outstanding was $ 94.7 million ($ 111.4 million as of December 31, 2023), and consisted of long-term debt due within one year and included no unamortized debt issuance costs. </context> | us-gaap:DebtCurrent |
As of December 31, 2024, total short-term debt outstanding was $ 94.7 million ($ 111.4 million as of December 31, 2023), and consisted of long-term debt due within one year and included no unamortized debt issuance costs. | text | no | monetaryItemType | text: <entity> no </entity> <entity type> monetaryItemType </entity type> <context> As of December 31, 2024, total short-term debt outstanding was $ 94.7 million ($ 111.4 million as of December 31, 2023), and consisted of long-term debt due within one year and included no unamortized debt issuance costs. </context> | us-gaap:DeferredFinanceCostsCurrentNet |
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 | 362.0 | monetaryItemType | text: <entity> 362.0 </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:LineOfCreditFacilityMaximumBorrowingCapacity |
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 | 423.1 | monetaryItemType | text: <entity> 423.1 </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:LineOfCreditFacilityMaximumBorrowingCapacity |
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 |
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