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INCOME TAXES: Components of Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income taxes current:      
Federal $ 13,684 $ 19,252 $ (13,253)
State 5,754 15,750 5,634
Total 19,438 35,002 (7,619)
Income taxes deferred:      
Federal (28,931) (73,565) (18,419)
State (16,431) (15,608) (3,269)
Total (45,362) (89,173) (21,688)
Investment tax credits:      
Deferred 52,946 102,946 55,644
Restored (47,544) (38,102) (5,451)
Total 5,402 64,844 50,193
Affordable housing investments 6,807 4,380 6,410
Total income tax expense (13,715) 15,053 27,296
Idaho Power Company      
Income taxes current:      
Federal 27,816 20,447 (4,757)
State 8,128 12,674 3,627
Total 35,944 33,121 (1,130)
Income taxes deferred:      
Federal (35,697) (67,549) (19,086)
State (18,826) (12,735) (1,051)
Total (54,523) (80,284) (20,137)
Investment tax credits:      
Deferred 52,946 102,946 55,644
Restored (47,544) (38,102) (5,451)
Total 5,402 64,844 50,193
Affordable housing investments 0 0 0
Total income tax expense $ (13,177) $ 17,681 $ 28,926