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REVENUES: Electric utility operating revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenues [Abstract]      
Revenue from contracts with customers $ 1,746,972 $ 1,768,881 $ 1,639,612
Alternative revenue programs and other revenues 62,637 54,084 123,282
Electric utility revenues $ 1,809,609 $ 1,822,965 $ 1,762,894