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INCOME TAXES: Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Income, net of adjustment for income attributable to noncontrolling interests [1] $ 309,757 $ 304,227 $ 288,491
Tax Jurisdiction of Domicile [Extensible Enumeration] UNITED STATES    
Federal income tax expense at statutory rate $ 65,049 $ 63,888 $ 60,583
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
State income taxes, net of federal benefit [2] $ 12,480 $ 14,420 $ 13,675
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent [2] 4.00% 4.70% 4.70%
AFUDC $ (20,727) $ (17,015) $ (13,279)
Income Tax Reconciliation, AFUDC Percent (6.70%) (5.60%) (4.60%)
Capitalized interest $ 7,721 $ 5,493 $ 3,097
Income Tax Reconciliation, Capitalized interest percentage 2.50% 1.80% 1.10%
Removal costs $ (5,707) $ (5,109) $ (6,312)
Income Tax Reconciliation Flow-through, Removal Costs percentage (1.80%) (1.70%) (2.20%)
Capitalized overhead costs $ (2,100) $ (2,100) $ (2,100)
Income Tax Reconciliation Flow-through, Capitalized overhead costs percentage (0.70%) (0.70%) (0.70%)
Capitalized repair costs $ (24,150) $ (19,320) $ (24,360)
Income Tax Reconciliation, Capitalized overhead costs percentage (7.80%) (6.40%) (8.40%)
Income Tax Reconciliation, Depreciation $ 22,001 $ 18,705 $ 18,041
Income Tax Reconciliation Flow-through, Depreciation percentage 7.10% 6.10% 6.30%
Income Tax Reconciliation, Excess deferred income tax reversal $ (9,723) $ (10,047) $ (10,684)
Income Tax Reconciliation Flow-through, Excess deferred income tax reversal percentage (3.10%) (3.30%) (3.70%)
Income Tax Reconciliation, Income tax return adjustment $ (8,046) $ 1,844 $ (8,229)
Income Tax Reconciliation Flow-through, income tax return adj. percentage (2.60%) 0.60% (2.90%)
Income tax adjustment, Flow-through State related $ 324 $ 6,043 $ 2,127
Income tax adjustment, Flow-through State related Percentage 0.10% 2.00% 0.70%
Income Tax Reconciliation Flow-through, Other, net $ (808) $ 776 $ 1,874
Income Tax Reconciliation Flow-through, Other,net percentage (0.30%) 0.30% 0.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent $ (229) $ (516) $ 120
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent (0.10%) (0.20%) 0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent   1.70% 1.90%
Total income tax expense $ (13,715) $ 15,053 $ 27,296
Effective tax rate (4.40%) 4.90% 9.50%
Real estate-related investment distributions      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ (670) $ (1,611) $ (507)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.20%) (0.50%) (0.20%)
Real estate-related investment amortization      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 6,204 $ 5,203 $ 5,570
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 2.00%    
Investment tax credits= federal      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (7,208) $ (4,480) $ (2,344)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.30%) (1.50%) (0.80%)
Investment tax credits= Idaho      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ 0 $ (3,791) $ (3,107)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% (1.20%) (1.10%)
Accumulated deferred investment tax credits-federal      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (7,017) $ (8,712) $ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.30%) (2.90%) 0.00%
Accumulated deferred investment tax credits-Idaho      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (33,319) $ (21,119) $ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (10.80%) (6.90%) 0.00%
Real estate-related tax credits-federal      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (7,790) $ (7,499) $ (6,869)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.50%) (2.50%) (2.40%)
Idaho Power Company      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Income, net of adjustment for income attributable to noncontrolling interests [1] $ 302,685 $ 298,286 $ 285,736
Federal income tax expense at statutory rate $ 63,564 $ 62,640 $ 60,005
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
State income taxes, net of federal benefit [3] $ 12,195 $ 14,139 $ 13,544
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent [3] 4.00% 4.70% 4.70%
AFUDC $ (20,727) $ (17,015) $ (13,279)
Income Tax Reconciliation, AFUDC Percent (6.80%) (5.70%) (4.60%)
Capitalized interest $ 7,721 $ 5,493 $ 3,097
Income Tax Reconciliation, Capitalized interest percentage 2.60% 1.80% 1.10%
Removal costs $ (5,707) $ (5,109) $ (6,312)
Income Tax Reconciliation Flow-through, Removal Costs percentage (1.90%) (1.70%) (2.20%)
Capitalized overhead costs $ (2,100) $ (2,100) $ (2,100)
Income Tax Reconciliation Flow-through, Capitalized overhead costs percentage (0.70%) (0.70%) (0.70%)
Capitalized repair costs $ (24,150) $ (19,320) $ (24,360)
Income Tax Reconciliation, Capitalized overhead costs percentage (8.00%) (6.50%) (8.50%)
Income Tax Reconciliation, Depreciation $ 22,001 $ 18,705 $ 18,041
Income Tax Reconciliation Flow-through, Depreciation percentage 7.30% 6.30% 6.30%
Income Tax Reconciliation, Excess deferred income tax reversal $ (9,723) $ (10,047) $ (10,684)
Income Tax Reconciliation Flow-through, Excess deferred income tax reversal percentage (3.20%) (3.40%) (3.70%)
Income Tax Reconciliation, Income tax return adjustment $ (8,581) $ 1,794 $ (7,732)
Income Tax Reconciliation Flow-through, income tax return adj. percentage (2.80%) 0.60% (2.70%)
Income tax adjustment, Flow-through State related $ 684 $ 6,361 $ 2,537
Income tax adjustment, Flow-through State related Percentage 0.20% 2.10% 0.90%
Income Tax Reconciliation Flow-through, Other, net $ (577) $ 759 $ 1,499
Income Tax Reconciliation Flow-through, Other,net percentage (0.20%) 0.30% 0.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent $ (233) $ (517) $ 121
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent (0.10%) (0.20%) 0.00%
Total income tax expense $ (13,177) $ 17,681 $ 28,926
Effective tax rate (4.40%) 5.90% 10.10%
Idaho Power Company | Investment tax credits= federal      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (7,208) $ (4,480) $ (2,344)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.40%) (1.50%) (0.80%)
Idaho Power Company | Investment tax credits= Idaho      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ 0 $ (3,791) $ (3,107)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% (1.30%) (1.10%)
Idaho Power Company | Accumulated deferred investment tax credits-federal      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (7,017) $ (8,712) $ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.30%) (2.90%) 0.00%
Idaho Power Company | Accumulated deferred investment tax credits-Idaho      
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation      
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ (33,319) $ (21,119) $ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (11.00%) (7.10%) 0.00%
[1] Net of adjustment for income attributable to noncontrolling interests.
[2] State taxes in Idaho made up the majority (greater than 50%) of the tax effect in this category.
[3] State taxes in Idaho made up the majority (greater than 50%) of the tax effect in this category.