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EQUITY INVESTMENTS (Tables)
6 Months Ended
Jun. 30, 2025
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Equity Method Investments We account for our investment in ATC under the equity method of accounting.
ALLETE’s Investment in ATC 
Millions 
Equity Investment Balance as of December 31, 2024$194.4 
Cash Investments11.3 
Equity in ATC Earnings12.9 
Distributed ATC Earnings(12.3)
Amortization of the Remeasurement of Deferred Income Taxes0.6 
Equity Investment Balance as of June 30, 2025$206.9 
We account for our investment in Nobles 2 under the equity method of accounting.
ALLETE’s Investment in Nobles 2
Millions
Equity Investment Balance as of December 31, 2024$145.7 
Equity in Nobles 2 Earnings (a)
(1.0)
Distributed Nobles 2 Earnings(1.1)
Equity Investment Balance as of June 30, 2025$143.6 
(a)The Company also recorded earnings from net loss attributable to non-controlling interest of $7.3 million related to its investment in Nobles 2.