NATURE OF OPERATIONS AND FINANCIAL STATEMENT PRESENTATION (Narrative) (Details) customer in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) customer	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) mi² customer	Jun. 30, 2022 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of retail customers | customer	445		445
Area in which company generates transmits and distributes electricity to retail electric customers (square mile) | mi²			1,155
PTC benefits | $	$ 4	$ 6	$ 9	$ 8