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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, 2023 USD ($) MWh | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utility, Property, Plant and Equipment |  |  |  |
Production |  | $ 2,794,534,000 | $ 2,700,494,000 |
Transmission |  | 1,392,338,000 | 1,346,463,000 |
Distribution |  | 2,454,458,000 | 2,192,135,000 |
General and Other |  | 650,202,000 | 589,375,000 |
Utility plant in service |  | 7,291,532,000 | 6,828,467,000 |
Accumulated provision for depreciation |  | (2,557,744,000) | (2,465,279,000) |
Utility plant in service - net |  | $ 4,733,788,000 | $ 4,363,188,000 |
Average depreciation rate |  | 2.90% | 2.70% | 2.90%
Idaho Energy Resources Co. Coal purchases from Bridger Coal Company |  | $ 275,405,000 | $ 230,210,000 | $ 180,550,000
Regulatory Liabilities |  | $ 882,553,000 | $ 860,601,000 |
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 |  | $ 770,179,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress |  | 12,891,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation |  | $ 500,685,000 |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 33.00% |  |
Nameplate Capacity (in MW) | MWh | [1] | 775 |  |
Valmy Plant |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Jointly Owned Utility Plant, Name |  | North Valmy unit 2(2) |  |
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service | [2] | $ 262,544,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress | [2] | 2,237,000 |  |
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation | [2] | $ 225,147,000 |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | [2] | 50.00% |  |
Nameplate Capacity (in MW) | MWh | [1],[2] | 145 |  |
Production |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 3.50% | 2.89% |
Transmission |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 1.90% | 1.91% |
Distribution |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 2.18% | 2.15% |
General and Other |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Average depreciation rate |  | 5.21% | 5.36% |
Bridger Coal Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Idaho Energy Resources Co. Coal purchases from Bridger Coal Company |  | $ 67,900,000 | $ 60,400,000 | 59,700,000
Idaho Power Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Utility plant in service |  | 7,291,532,000 | 6,828,467,000 |
Accumulated provision for depreciation |  | (2,557,744,000) | (2,465,279,000) |
Utility plant in service - net |  | $ 4,733,788,000 | $ 4,363,188,000 |
Average depreciation rate |  | 2.89% | 2.66% |
Idaho Energy Resources Co. Coal purchases from Bridger Coal Company |  | $ 275,405,000 | $ 230,210,000 | $ 180,550,000
Construction work in progress |  | $ 985,500,000 |  |
Ida-West Energy |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
Marysville Hydro Partners |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Utility plant in service - net |  | $ 14,900,000 |  |
Hells Canyon Complex | Idaho Power Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Construction work in progress |  | 459,800,000 |  |
IPUC authorized AFUDC Collection HCC Relicensing - Gross | Hells Canyon Complex | Idaho Power Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Regulatory Liabilities |  | 8,800,000 |  |
IPUC authorized AFUDC Collection HCC Relicensing - Net | Hells Canyon Complex | Idaho Power Company |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Regulatory Liabilities |  | 6,500,000 |  |
Deferred revenue-AFUDC |  |  |  |
Public Utility, Property, Plant and Equipment |  |  |  |
Regulatory Liabilities | [3] | $ 228,671,000 | $ 207,528,000 |
[1] | Idaho Power’s share of nameplate capacity.
[2] | Pursuant to an agreement with NV Energy, Idaho Power's participation in coal-fired operations of North Valmy ended in December 2019 at unit 1 and is planned to end no later than the end of 2025 at unit 2.
[3] | 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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