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PROPERTY, PLANT AND EQUIPMENT AND JOINTLY-OWNED PROJECTS: Property, Plant and Equipmnt Level 4 (Details) | 12 Months Ended
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Dec. 31, 2025 USD ($) MWh | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Public Utility, Property, Plant and Equipment |  |  |  |
Production |  | $ 2,675,671,000 | $ 2,858,678,000 |
Transmission |  | 1,653,490,000 | 1,534,474,000 |
Energy Storage | [1] | 509,740,000 | 393,012,000 |
Distribution | [1] | 2,658,849,000 | 2,465,423,000 |
General and Other |  | 751,356,000 | 706,176,000 |
Utility plant in service |  | 8,249,106,000 | 7,957,763,000 |
Accumulated provision for depreciation |  | (2,599,465,000) | (2,714,706,000) |
Utility plant in service - net |  | $ 5,649,641,000 | $ 5,243,057,000 |
Average depreciation rate |  | 3.20% | 3.10% | 2.90%
Idaho Energy Resources Co. Coal purchases from Bridger Coal Company |  | $ 253,236,000 | $ 259,204,000 | $ 275,405,000
Regulatory Liabilities |  | $ 1,052,151,000 | $ 984,326,000 |
Jim Bridger Plant |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Jointly Owned Utility Plant, Name |  | Jim Bridger units 1-4 |  |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service |  | $ 777,096,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress |  | 780,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation |  | $ 575,151,000 |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 33.00% |  |
Nameplate Capacity (in MW) | MWh | [2] | 775 |  |
Valmy Plant |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Jointly Owned Utility Plant, Name |  | North Valmy units 1 & 2(2) |  |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | [3] | $ 42,113,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | [3] | 21,118,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | [3] | $ (128,000) |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | [3] | 50.00% |  |
Nameplate Capacity (in MW) | MWh | [2],[3] | 284 |  |
Production |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 4.02% | 3.90% |
Transmission |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 1.91% | 1.89% |
Electric Energy Storage |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate | [1] | 5.06% | 3.61% |
Distribution |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate | [1] | 2.17% | 2.16% |
General and Other |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 5.27% | 5.18% |
Bridger Coal Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Idaho Energy Resources Co. Coal purchases from Bridger Coal Company |  | $ 54,400,000 | $ 51,600,000 | 67,900,000
Idaho Power Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Utility plant in service |  | 8,249,106,000 | 7,957,763,000 |
Accumulated provision for depreciation |  | (2,599,465,000) | (2,714,706,000) |
Utility plant in service - net |  | $ 5,649,641,000 | $ 5,243,057,000 |
Average depreciation rate |  | 3.18% | 3.06% |
Idaho Energy Resources Co. Coal purchases from Bridger Coal Company |  | $ 253,236,000 | $ 259,204,000 | $ 275,405,000
Construction work in progress |  | 1,700,000,000 |  |
Hells Canyon Complex | Idaho Power Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Construction work in progress |  | 536,100,000 |  |
Deferred revenue-AFUDC |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Regulatory Liabilities | [4] | $ 280,979,000 | $ 250,942,000 |
[1] | The presentation of the major classifications of Idaho Power's utility plant in service in the table above has been modified to separately report the energy storage balance for the years ended December 31, 2025 and 2024. The prior year energy storage balance, which had previously been classified in the distribution balance, has been reclassified to conform with the current year presentation. This change reflects a shift from one acceptable presentation to another to enhance transparency.
[2] | Idaho Power’s share of nameplate capacity.
[3] | Pursuant to an agreement with NV Energy, Idaho Power ceased participation in coal-fired operations of North Valmy in December 2019 at unit 1 and December 2025 at unit 2. Idaho Power's 2025 IRP identified a preferred resource portfolio and action plan that includes the conversion of the two generating units at the North Valmy plant from coal to natural gas by mid-2026. The conversion of Unit 1 has been completed and the unit was placed in-service in December 2025, and conversion of Unit 2 is expected to be completed by mid-2026.
[4] | Idaho Power is collecting revenue in the Idaho jurisdiction for AFUDC on HCC relicensing costs but is deferring revenue recognition of the amounts collected until the license is issued and the asset is placed in service under the new license.

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