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BUSINESS SEGMENTS - By Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Contracts with Customers – Utility | $ 320.2 | $ 310.5 | $ 958.1 | $ 928.6 |
Contracts with Customers – Non-utility | 53.3 | 95.4 | 173.0 | 232.6 |
Other – Non-utility | 1.5 | 1.3 | 4.4 | 3.8 |
Total Operating Revenue | 375.0 | 407.2 | 1,135.5 | 1,165.0 |
Transmission Services – Utility | 19.2 | 19.6 | 57.5 | 43.9 |
Cost of Sales – Non-utility | 26.0 | 47.0 | 75.2 | 103.2 |
Operating and Maintenance | 90.7 | 92.7 | 280.3 | 286.5 |
Depreciation and Amortization | 72.5 | 70.8 | 215.4 | 201.8 |
Taxes Other than Income Taxes | 16.6 | 15.3 | 49.8 | 50.3 |
Net Income Attributable to ALLETE | 27.1 | 45.0 | 115.1 | 128.7 |
Interest Expense | (25.6) | (20.3) | (70.1) | (60.8) |
Equity Earnings | 5.6 | 5.1 | 17.5 | 16.5 |
Income Tax Expense (Benefit) | 1.6 | 2.9 | 8.5 | 8.3 |
Assets | 7,152.9 | 6,737.2 | 7,152.9 | 6,737.2 | $ 6,754.3
Equity Investment | 357.7 | 337.9 | 357.7 | 337.9 | $ 340.1
Capital Expenditures | 262.1 | 85.8 | 537.8 | 229.5 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Contracts with Customers – Utility | 320.2 | 310.5 | 958.1 | 928.6 |
Contracts with Customers – Non-utility | 26.7 | 64.6 | 91.6 | 142.3 |
Other – Non-utility | 1.5 | 1.3 | 4.4 | 3.8 |
Total Operating Revenue | 348.4 | 376.4 | 1,054.1 | 1,074.7 |
Fuel, Purchased Power and Gas – Utility | 121.1 | 117.2 | 358.5 | 358.9 |
Transmission Services – Utility | 19.2 | 19.6 | 57.5 | 43.9 |
Cost of Sales – Non-utility | 8.8 | 26.6 | 22.4 | 43.6 |
Operating and Maintenance | 85.0 | 82.4 | 262.2 | 253.5 |
Depreciation and Amortization | 68.7 | 67.1 | 203.6 | 190.1 |
Taxes Other than Income Taxes | 16.1 | 14.6 | 48.2 | 48.5 |
Other Segment Income (Expense) Items | 0.7 | 0.7 | 12.1 | 9.2 |
Net Income Attributable to ALLETE | 30.2 | 49.6 | 113.8 | 145.4 |
Interest Expense | (19.0) | (17.7) | (55.1) | (52.5) |
Equity Earnings | 6.7 | 6.1 | 19.6 | 17.8 |
Income Tax Expense (Benefit) | 3.4 | 4.4 | 14.6 | 8.2 |
Assets | 6,717.3 | 6,325.2 | 6,717.3 | 6,325.2 |
Equity Investment | 215.8 | 190.3 | 215.8 | 190.3 |
Capital Expenditures | 258.5 | 84.7 | 530.6 | 221.4 |
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Contracts with Customers – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Contracts with Customers – Non-utility | 26.6 | 30.8 | 81.4 | 90.3 |
Other – Non-utility | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Revenue | 26.6 | 30.8 | 81.4 | 90.3 |
Depreciation and Amortization | 3.8 | 3.7 | 11.8 | 11.7 |
Net Income Attributable to ALLETE | (3.1) | (4.6) | 1.3 | (16.7) |
Interest Expense | (6.6) | (2.6) | (15.0) | (8.3) |
Equity Earnings | (1.1) | (1.0) | (2.1) | (1.3) |
Income Tax Expense (Benefit) | (1.8) | (1.5) | (6.1) | 0.1 |
Assets | 435.6 | 412.0 | 435.6 | 412.0 |
Equity Investment | 141.9 | 147.6 | 141.9 | 147.6 |
Capital Expenditures | 3.6 | 1.1 | 7.2 | 8.1 |
Regulated Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Operating Revenue | 320.2 | 310.5 | 958.1 | 928.6 |
Net Income Attributable to ALLETE | 32.5 | 34.0 | 93.9 | 111.9 |
Regulated Operations | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Contracts with Customers – Utility | 320.2 | 310.5 | 958.1 | 928.6 |
Contracts with Customers – Non-utility | 0.0 | 0.0 | 0.0 | 0.0 |
Other – Non-utility | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Revenue | 320.2 | 310.5 | 958.1 | 928.6 |
Fuel, Purchased Power and Gas – Utility | 121.1 | 117.2 | 358.5 | 358.9 |
Transmission Services – Utility | 19.2 | 19.6 | 57.5 | 43.9 |
Cost of Sales – Non-utility | 0.0 | 0.0 | 0.0 | 0.0 |
Operating and Maintenance | 65.1 | 63.6 | 202.4 | 197.1 |
Depreciation and Amortization | 53.3 | 52.2 | 158.1 | 145.4 |
Taxes Other than Income Taxes | 13.4 | 12.4 | 40.0 | 41.8 |
Other Segment Income (Expense) Items | (15.6) | (11.5) | (47.7) | (29.6) |
Net Income Attributable to ALLETE | 32.5 | 34.0 | 93.9 | 111.9 |
Interest Expense | (17.7) | (16.7) | (52.2) | (49.0) |
Equity Earnings | 6.7 | 6.1 | 19.6 | 17.8 |
Income Tax Expense (Benefit) | 7.9 | 5.0 | 23.3 | 13.7 |
Assets | 4,864.8 | 4,410.3 | 4,864.8 | 4,410.3 |
Equity Investment | 215.8 | 190.3 | 215.8 | 190.3 |
Capital Expenditures | 237.4 | 73.8 | 489.2 | 203.8 |
ALLETE Clean Energy |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Operating Revenue | 12.3 | 34.1 | 44.1 | 68.9 |
Net Income Attributable to ALLETE | (3.6) | 3.9 | 4.7 | 10.1 |
ALLETE Clean Energy | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Contracts with Customers – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Contracts with Customers – Non-utility | 10.8 | 32.8 | 39.7 | 65.1 |
Other – Non-utility | 1.5 | 1.3 | 4.4 | 3.8 |
Total Operating Revenue | 12.3 | 34.1 | 44.1 | 68.9 |
Fuel, Purchased Power and Gas – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Transmission Services – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of Sales – Non-utility | 0.0 | 18.3 | 0.0 | 18.3 |
Operating and Maintenance | 12.9 | 12.3 | 40.6 | 37.5 |
Depreciation and Amortization | 14.5 | 14.4 | 43.5 | 43.2 |
Taxes Other than Income Taxes | 2.7 | 2.2 | 8.2 | 6.7 |
Other Segment Income (Expense) Items | 14.2 | 17.0 | 52.9 | 46.9 |
Net Income Attributable to ALLETE | (3.6) | 3.9 | 4.7 | 10.1 |
Interest Expense | 0.0 | 0.0 | 0.0 | (0.2) |
Equity Earnings | 0.0 | 0.0 | 0.0 | 0.0 |
Income Tax Expense (Benefit) | (3.3) | (4.8) | (8.5) | (13.3) |
Assets | 1,440.8 | 1,581.6 | 1,440.8 | 1,581.6 |
Equity Investment | 0.0 | 0.0 | 0.0 | 0.0 |
Capital Expenditures | 1.1 | 2.7 | 5.3 | 4.3 |
New Energy |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Operating Revenue | 15.9 | 31.8 | 51.9 | 77.2 |
Net Income Attributable to ALLETE | 1.3 | 11.7 | 15.2 | 23.4 |
New Energy | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Contracts with Customers – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Contracts with Customers – Non-utility | 15.9 | 31.8 | 51.9 | 77.2 |
Other – Non-utility | 0.0 | 0.0 | 0.0 | 0.0 |
Total Operating Revenue | 15.9 | 31.8 | 51.9 | 77.2 |
Fuel, Purchased Power and Gas – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Transmission Services – Utility | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of Sales – Non-utility | 8.8 | 8.3 | 22.4 | 25.3 |
Operating and Maintenance | 7.0 | 6.5 | 19.2 | 18.9 |
Depreciation and Amortization | 0.9 | 0.5 | 2.0 | 1.5 |
Taxes Other than Income Taxes | 0.0 | 0.0 | 0.0 | 0.0 |
Other Segment Income (Expense) Items | 2.1 | (4.8) | 6.9 | (8.1) |
Net Income Attributable to ALLETE | 1.3 | 11.7 | 15.2 | 23.4 |
Interest Expense | (1.3) | (1.0) | (2.9) | (3.3) |
Equity Earnings | 0.0 | 0.0 | 0.0 | 0.0 |
Income Tax Expense (Benefit) | (1.2) | 4.2 | (0.2) | 7.8 |
Assets | 411.7 | 333.3 | 411.7 | 333.3 |
Equity Investment | 0.0 | 0.0 | 0.0 | 0.0 |
Capital Expenditures | $ 20.0 | $ 8.2 | $ 36.1 | $ 13.3 |

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