XML 130 R104.htm IDEA: XBRL DOCUMENT v3.25.0.1
Business Segment - By Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]                              
Contracts with Customers – Utility                         $ 1,242.7 $ 1,238.3 $ 1,259.3
Contracts with Customers – Non-utility                         282.1 636.4 303.8
Other – Non-utility                         5.0 5.1 7.6
Total Operating Revenue $ 364.8 $ 407.2 $ 354.5 $ 403.3 $ 402.7 $ 378.8 $ 533.4 $ 564.9 $ 425.8 $ 388.3 $ 373.1 $ 383.5 1,529.8 1,879.8 1,570.7
Fuel, Purchased Power and Gas – Utility                         477.6 482.9 545.5
Transmission Services – Utility                         64.6 88.2 76.7
Cost of Sales – Non-utility                         129.2 473.5 182.8
Operating and Maintenance                         361.4 345.3 318.9
Depreciation and Amortization                         271.5 251.8 242.2
Taxes Other than Income Taxes                         65.4 57.2 70.4
Net Income Attributable to ALLETE 50.6 $ 45.0 $ 33.0 $ 50.7 51.5 $ 85.9 $ 51.5 $ 58.2 51.7 $ 33.7 $ 37.6 $ 66.3 179.3 247.1 189.3
Interest Expense                         (81.7) (80.8) (75.2)
Equity Earnings                         25.0 21.7 18.7
Income Tax Benefit (Expense)                         (4.7) (27.9) 31.2
Assets 6,754.3       6,656.4       6,845.6       6,754.3 6,656.4 6,845.6
Equity Investment 340.1       331.2       322.7       340.1 331.2 322.7
Capital Expenditures                         348.0 256.0 208.1
Operating Segments                              
Segment Reporting Information [Line Items]                              
Contracts with Customers – Utility                         1,242.7 1,238.3 1,259.3
Contracts with Customers – Non-utility                         79.3 413.4 110.7
Other – Non-utility                         5.0 5.1 7.6
Total Operating Revenue                         1,327.0 1,656.8 1,377.6
Fuel, Purchased Power and Gas – Utility                         479.7 484.3 545.5
Transmission Services – Utility                         64.6 88.2 76.7
Cost of Sales – Non-utility                         18.3 342.2 56.7
Operating and Maintenance                         296.5 299.2 286.6
Depreciation and Amortization                         253.8 236.7 230.5
Taxes Other than Income Taxes                         62.9 54.5 68.1
Other Segment Items                         27.5 67.2 52.7
Net Income Attributable to ALLETE                         178.7 218.9 166.2
Interest Expense                         (66.4) (64.7) (60.4)
Equity Earnings                         26.5 23.1 19.3
Income Tax Benefit (Expense)                         (2.0) (25.1) 25.8
Assets 5,966.8       5,929.1       6,164.7       5,966.8 5,929.1 6,164.7
Equity Investment 194.4       179.7       165.4       194.4 179.7 165.4
Capital Expenditures                         294.9 231.0 160.5
Regulated Operations                              
Segment Reporting Information [Line Items]                              
Total Operating Revenue                         1,242.7 1,238.3 1,259.3
Net Income Attributable to ALLETE                         160.9 147.2 149.9
Regulated Operations | Operating Segments                              
Segment Reporting Information [Line Items]                              
Contracts with Customers – Utility                         1,242.7 1,238.3 1,259.3
Contracts with Customers – Non-utility                         0.0 0.0 0.0
Other – Non-utility                         0.0 0.0 0.0
Total Operating Revenue                         1,242.7 1,238.3 1,259.3
Fuel, Purchased Power and Gas – Utility                         479.7 484.3 545.5
Transmission Services – Utility                         64.6 88.2 76.7
Cost of Sales – Non-utility                         0.0 0.0 0.0
Operating and Maintenance                         250.0 247.1 239.3
Depreciation and Amortization                         196.3 179.2 171.9
Taxes Other than Income Taxes                         52.5 44.5 57.4
Other Segment Items                         (38.7) (47.8) (18.6)
Net Income Attributable to ALLETE                         160.9 147.2 149.9
Interest Expense                         (66.1) (63.9) (58.1)
Equity Earnings                         26.5 23.1 19.3
Income Tax Benefit (Expense)                         (17.6) (22.4) 10.4
Assets 4,489.4       4,335.0       4,291.4       4,489.4 4,335.0 4,291.4
Equity Investment 194.4       179.7       165.4       194.4 179.7 165.4
Capital Expenditures                         287.2 236.3 158.3
ALLETE Clean Energy                              
Segment Reporting Information [Line Items]                              
Total Operating Revenue                         84.3 418.5 118.3
Net Income Attributable to ALLETE                         17.8 71.7 16.3
ALLETE Clean Energy | Operating Segments                              
Segment Reporting Information [Line Items]                              
Contracts with Customers – Utility                         0.0 0.0 0.0
Contracts with Customers – Non-utility                         79.3 413.4 110.7
Other – Non-utility                         5.0 5.1 7.6
Total Operating Revenue                         84.3 418.5 118.3
Fuel, Purchased Power and Gas – Utility                         0.0 0.0 0.0
Transmission Services – Utility                         0.0 0.0 0.0
Cost of Sales – Non-utility                         18.3 342.2 56.7
Operating and Maintenance                         46.5 52.1 47.3
Depreciation and Amortization                         57.5 57.5 58.6
Taxes Other than Income Taxes                         10.4 10.0 10.7
Other Segment Items                         66.2 115.0 71.3
Net Income Attributable to ALLETE                         17.8 71.7 16.3
Interest Expense                         (0.3) (0.8) (2.3)
Equity Earnings                         0.0 0.0 0.0
Income Tax Benefit (Expense)                         15.6 (2.7) 15.4
Assets 1,477.4       1,594.1       1,873.3       1,477.4 1,594.1 1,873.3
Equity Investment 0.0       0.0       0.0       0.0 0.0 0.0
Capital Expenditures                         7.7 (5.3) 2.2
Corporate and Other / Eliminations                              
Segment Reporting Information [Line Items]                              
Total Operating Revenue                         202.8 223.0 193.1
Net Income Attributable to ALLETE                         0.6 28.2 23.1
Corporate and Other / Eliminations | Corporate and Other / Eliminations                              
Segment Reporting Information [Line Items]                              
Contracts with Customers – Utility                         0.0 0.0 0.0
Contracts with Customers – Non-utility                         202.8 223.0 193.1
Other – Non-utility                         0.0 0.0 0.0
Total Operating Revenue                         202.8 223.0 193.1
Depreciation and Amortization                         17.7 15.1 11.7
Net Income Attributable to ALLETE                         0.6 28.2 23.1
Interest Expense                         (15.3) (16.1) (14.8)
Equity Earnings                         (1.5) (1.4) (0.6)
Income Tax Benefit (Expense)                         (2.7) (2.8) 5.4
Assets 787.5       727.3       680.9       787.5 727.3 680.9
Equity Investment $ 145.7       $ 151.5       $ 157.3       145.7 151.5 157.3
Capital Expenditures                         $ 53.1 $ 25.0 $ 47.6