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INCOME TAXES: Components of Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income taxes current:      
Federal $ (13,253) $ 31,668 $ 15,210
State 5,634 5,474 6,630
Total (7,619) 37,142 21,840
Income taxes deferred:      
Federal (18,419) (13,696) (1,787)
State (3,269) 4,087 1,154
Total (21,688) (9,609) (633)
Investment tax credits:      
Deferred 55,644 8,945 14,698
Restored (5,451) (3,119) (2,866)
Total 50,193 5,826 11,832
Affordable housing investments 6,410 4,485 3,873
Total income tax expense 27,296 37,844 36,912
Idaho Power Company      
Income taxes current:      
Federal (4,757) 37,696 40,525
State 3,627 11,715 12,932
Total (1,130) 49,411 53,457
Income taxes deferred:      
Federal (19,086) (13,127) (21,737)
State (1,051) (2,202) (5,295)
Total (20,137) (15,329) (27,032)
Investment tax credits:      
Deferred 55,644 8,945 14,698
Restored (5,451) (3,119) (2,866)
Total 50,193 5,826 11,832
Affordable housing investments 0 0 0
Total income tax expense $ 28,926 $ 39,908 $ 38,257