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REVENUES: Electric utility operating revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue from contracts with customers $ 1,639,612 $ 1,557,974 $ 1,382,653
Alternative revenue programs and other revenues 123,282 83,066 72,757
Electric utility revenues $ 1,762,894 $ 1,641,040 $ 1,455,410