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EQUITY INVESTMENTS (Tables)
3 Months Ended
Mar. 31, 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 Investments5.5 
Equity in ATC Earnings6.5 
Distributed ATC Earnings(7.2)
Amortization of the Remeasurement of Deferred Income Taxes0.3 
Equity Investment Balance as of March 31, 2025$199.5 
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)
(0.5)
Distributed Nobles 2 Earnings(0.7)
Equity Investment Balance as of March 31, 2025$144.5 
(a)The Company also recorded earnings from net loss attributable to non-controlling interest of $3.9 million related to its investment in Nobles 2.