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CONSOLIDATED STATEMENT OF INCOME Unaudited - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating Revenue    
Contracts with Customers – Utility $ 332.8 $ 338.3
Contracts with Customers – Non-utility 65.9 63.7
Other – Non-utility 1.5 1.3
Total Operating Revenue 400.2 403.3
Operating Expenses    
Fuel, Purchased Power and Gas – Utility 123.0 133.5
Transmission Services – Utility 19.0 22.7
Cost of Sales – Non-utility 24.9 24.4
Operating and Maintenance 93.0 91.7
Depreciation and Amortization 69.7 65.0
Taxes Other than Income Taxes 17.6 18.7
Total Operating Expenses 347.2 356.0
Operating Income 53.0 47.3
Other Income (Expense)    
Interest Expense (21.4) (20.4)
Equity Earnings 6.0 5.5
Other 4.6 8.6
Total Other Expense (10.8) (6.3)
Income Before Income Taxes 42.2 41.0
Income Tax Expense 7.5 4.0
Net Income 34.7 37.0
Net Loss Attributable to Non-Controlling Interest (21.4) (13.7)
Net Income Attributable to ALLETE $ 56.1 $ 50.7
Average Shares of Common Stock    
Basic (in shares) 57.9 57.6
Diluted (in shares) 58.0 57.7
Basic Earnings Per Share of Common Stock (in usd per share) $ 0.97 $ 0.88
Diluted Earnings Per Share of Common Stock (in usd per share) $ 0.97 $ 0.88