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PROPERTY, PLANT, AND EQUIPMENT - PLANT TO BE RETIRED (Details) $ in Millions | Sep. 30, 2023 USD ($) MW | Jun. 30, 2023 MW
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WE | OCPP |  |
Property, plant, and equipment |  |
Net book value of plant to be retired | $ 798.9 |
WE | West Riverside Energy Center |  |
Property, plant, and equipment |  |
Capacity of generation unit | MW | 100 | 100
WPS | Columbia Energy Center |  |
Property, plant, and equipment |  |
Net book value of plant to be retired | $ 261.8 |

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