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INCOME TAXES: Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Federal income tax expense at statutory rate $ 60,583 $ 62,333 $ 59,317
AFUDC (13,279) (10,752) (9,141)
Capitalized interest 3,097 1,633 1,077
Investment tax credits (5,451) (3,119) (2,866)
Removal costs (6,312) (4,900) (3,302)
Capitalized overhead costs (2,100) (3,150) (8,190)
Capitalized repair costs (24,360) (19,320) (17,430)
State income taxes, net of federal benefit 15,802 18,139 11,359
Depreciation 18,041 11,897 14,233
Excess deferred income tax reversal (10,684) (11,405) (8,958)
Income tax return adjustments (8,229) (2,692) 3,169
Affordable housing tax credits (6,869) (6,362) (6,245)
Affordable housing investment distributions (507) (812) (1,010)
Affordable housing investment amortization 5,570 4,355 4,095
Other, net 1,994 1,999 804
Total income tax expense $ 27,296 $ 37,844 $ 36,912
Effective tax rate 9.50% 12.70% 13.10%
Idaho Power Company      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Federal income tax expense at statutory rate $ 60,005 $ 61,903 $ 59,111
AFUDC (13,279) (10,752) (9,141)
Capitalized interest 3,097 1,633 1,077
Investment tax credits (5,451) (3,119) (2,866)
Removal costs (6,312) (4,900) (3,302)
Capitalized overhead costs (2,100) (3,150) (8,190)
Capitalized repair costs (24,360) (19,320) (17,430)
State income taxes, net of federal benefit 16,081 18,352 11,633
Depreciation 18,041 11,897 14,233
Excess deferred income tax reversal (10,684) (11,405) (8,958)
Income tax return adjustments (7,732) (2,827) 1,759
Affordable housing tax credits 0 0 0
Affordable housing investment distributions 0 0 0
Affordable housing investment amortization 0 0 0
Other, net 1,620 1,596 331
Total income tax expense $ 28,926 $ 39,908 $ 38,257
Effective tax rate 10.10% 13.50% 13.60%