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INCOME TAXES: Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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