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Equity Investments (Tables)
 12 Months Ended
Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]  
Equity Investments
ALLETE’s Investment in ATC  
Year Ended December 3120242023
Millions  
Equity Investment Beginning Balance$179.7 $165.4 
Cash Investments5.8 8.2 
Equity in ATC Earnings26.5 23.1 
Distributed ATC Earnings(18.9)(18.3)
Amortization of the Remeasurement of Deferred Income Taxes1.3 1.3 
Equity Investment Ending Balance$194.4 $179.7 

ATC Summarized Financial Data  
Balance Sheet Data  
As of December 3120242023
Millions  
Current Assets$126.6 $115.2 
Non-Current Assets6,792.6 6,337.0 
Total Assets$6,919.2 $6,452.2 
Current Liabilities$482.4 $495.9 
Long-Term Debt3,083.4 2,736.0 
Other Non-Current Liabilities545.0 585.2 
Members’ Equity2,808.4 2,635.1 
Total Liabilities and Members’ Equity$6,919.2 $6,452.2 
Income Statement Data   
Year Ended December 31202420232022
Millions   
Revenue$911.3 $818.9 $751.2 
Operating Expense442.3 407.6 381.5 
Other Expense137.8 131.7 122.9 
Net Income$331.2 $279.6 $246.8 
ALLETE’s Equity in Net Income$26.5 $23.1 $19.3 
ALLETE’s Investment in Nobles 2
Millions
Equity Investment Balance as of December 31, 2023$151.5 
Equity in Nobles 2 Earnings (a)
(1.5)
Distributed Nobles 2 Earnings(4.3)
Equity Investment Balance as of December 31, 2024$145.7 
(a)The Company also recorded net loss attributable to non-controlling interest of $11.7 million related to its investment in Nobles 2.