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CONSOLIDATED STATEMENT OF EQUITY Unaudited - USD ($) $ in Millions | Total | Common Stock | Accumulated Other Comprehensive Loss | Retained Earnings | Non-Controlling Interest in Subsidiaries
--- | --- | --- | --- | --- | ---
Balance, Beginning of Period at Dec. 31, 2023 |  | $ 1,803.7 | $ (20.5) | $ 1,026.4 | $ 597.0
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 15.4 |  |  |
Unrealized Gain on Debt Securities | $ 0.1 |  | 0.1 |  |
Defined Benefit Pension and Other Postretirement Benefit Plans | (0.6) |  | (0.6) |  |
Net Income Attributable to ALLETE | 128.7 |  |  | 128.7 |
Common Stock Dividends |  |  |  | (122.0) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net |  |  |  |  | 1.4
Net Loss Attributable to Non-Controlling Interest | 39.3 |  |  |  | (36.8)
Distributions to Non-Controlling Interest |  |  |  |  | (0.9)
Balance, End of Period at Sep. 30, 2024 | 3,391.9 | 1,819.1 | (21.0) | 1,033.1 | 560.7
Balance, Beginning of Period at Dec. 31, 2023 | 0.5 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Proceeds from Non-Controlling Interest in Subsidiaries | 2.7 |  |  |  |
Net Loss Attributable to Non-Controlling Interest | (2.5) |  |  |  |
Total Redeemable Non-Controlling Interest at Sep. 30, 2024 | $ 0.7 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 2.115 |  |  |  |
Balance, Beginning of Period at Jun. 30, 2024 |  | 1,813.8 | (20.9) | 1,028.8 | 573.0
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 5.3 |  |  |
Unrealized Gain on Debt Securities | $ 0.1 |  | 0.1 |  |
Defined Benefit Pension and Other Postretirement Benefit Plans | (0.2) |  | (0.2) |  |
Net Income Attributable to ALLETE | 45.0 |  |  | 45.0 |
Common Stock Dividends |  |  |  | (40.7) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net |  |  |  |  | 0.0
Net Loss Attributable to Non-Controlling Interest | 12.3 |  |  |  | (12.1)
Distributions to Non-Controlling Interest |  |  |  |  | (0.2)
Balance, End of Period at Sep. 30, 2024 | 3,391.9 | 1,819.1 | (21.0) | 1,033.1 | 560.7
Balance, Beginning of Period at Jun. 30, 2024 | 0.9 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Net Loss Attributable to Non-Controlling Interest | (0.2) |  |  |  |
Total Redeemable Non-Controlling Interest at Sep. 30, 2024 | $ 0.7 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 0.705 |  |  |  |
Balance, Beginning of Period at Dec. 31, 2024 | $ 3,390.1 | 1,823.2 | (18.1) | 1,042.9 | 542.1
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 15.8 |  |  |
Unrealized Gain on Debt Securities | (0.1) |  | (0.1) |  |
Defined Benefit Pension and Other Postretirement Benefit Plans | 0.1 |  | 0.1 |  |
Net Income Attributable to ALLETE | 115.1 |  |  | 115.1 |
Common Stock Dividends |  |  |  | (127.0) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net |  |  |  |  | 2.0
Net Loss Attributable to Non-Controlling Interest | 60.5 |  |  |  | (50.9)
Distributions to Non-Controlling Interest |  |  |  |  | (1.9)
Balance, End of Period at Sep. 30, 2025 | 3,343.2 | 1,839.0 | (18.1) | 1,031.0 | 491.3
Balance, Beginning of Period at Dec. 31, 2024 | 0.4 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Proceeds from Non-Controlling Interest in Subsidiaries | 10.1 |  |  |  |
Net Loss Attributable to Non-Controlling Interest | (9.6) |  |  |  |
Distributions to Non-Controlling Interest | (0.2) |  |  |  |
Total Redeemable Non-Controlling Interest at Sep. 30, 2025 | $ 0.7 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 2.19 |  |  |  |
Balance, Beginning of Period at Jun. 30, 2025 |  | 1,833.7 | (18.1) | 1,046.3 | 504.4
Consolidated Statement of Equity [Roll Forward] |  |  |  |  |
Common Stock Issued |  | 5.3 |  |  |
Unrealized Gain on Debt Securities | $ (0.1) |  | (0.1) |  |
Defined Benefit Pension and Other Postretirement Benefit Plans | 0.1 |  | 0.1 |  |
Net Income Attributable to ALLETE | 27.1 |  |  | 27.1 |
Common Stock Dividends |  |  |  | (42.4) |
Proceeds from Non-Controlling Interest in Subsidiaries – Net |  |  |  |  | 0.0
Net Loss Attributable to Non-Controlling Interest | 13.8 |  |  |  | (11.6)
Distributions to Non-Controlling Interest |  |  |  |  | (1.5)
Balance, End of Period at Sep. 30, 2025 | 3,343.2 | $ 1,839.0 | $ (18.1) | $ 1,031.0 | $ 491.3
Balance, Beginning of Period at Jun. 30, 2025 | 0.8 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Proceeds from Non-Controlling Interest in Subsidiaries | 2.2 |  |  |  |
Net Loss Attributable to Non-Controlling Interest | (2.2) |  |  |  |
Distributions to Non-Controlling Interest | (0.1) |  |  |  |
Total Redeemable Non-Controlling Interest at Sep. 30, 2025 | $ 0.7 |  |  |  |
Redeemable Non-Controlling Interest |  |  |  |  |
Dividends Per Share of Common Stock (in usd per share) | $ 0.73 |  |  |  |

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