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PROPERTY, PLANT, AND EQUIPMENT	3 Months Ended
PROPERTY, PLANT, AND EQUIPMENT	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT, AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT Plant to be Retired Columbia Units 1 and 2 As a result of a MISO ruling received in June 2021, retirement of the jointly-owned Columbia generating units 1 and 2 became probable. Columbia generating units 1 and 2 are expected to be retired by June 2026. The total net book value of our ownership share of units 1 and 2 was $268.7 million at March 31, 2023, which does not include deferred taxes. These amounts were classified as plant to be retired within property, plant, and equipment on our balance sheets. These units are included in rate base, and we continue to depreciate them on a straight-line basis using the composite depreciation rates approved by the PSCW.