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PROPERTY, PLANT, AND EQUIPMENT - PLANT TO BE RETIRED (Details) $ in Millions | Sep. 30, 2024 USD ($) | May 31, 2024 MW
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WE | OCPP |  |
Property, plant, and equipment |  |
Net book value of plant to be retired | $ 666.7 |
WE | West Riverside Energy Center |  |
Property, plant, and equipment |  |
Jointly Owned Utility Plant, Proportionate Ownership Share of Capacity | MW |  | 200
WPS | Columbia Energy Center |  |
Property, plant, and equipment |  |
Net book value of plant to be retired | $ 252.7 |

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