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FAIR VALUE MEASUREMENTS: Fair Value Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Notes receivable | [1] | $ 1,507 | $ 2,155
Long-term debt | [1] | 3,447,338 | 3,073,662
Debt Securities, Held-to-Maturity, Fair Value | [1] | 33,822 | 32,151
Carrying Amount | Idaho Power Company |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | [1] | 3,447,338 | 3,073,662
Debt Securities, Held-to-Maturity, Fair Value | [1] | 33,822 | 32,151
Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Notes receivable | [1] | 1,507 | 2,155
Long-term debt | [1] | 3,270,200 | 2,807,803
Debt Securities, Held-to-Maturity, Fair Value | [1] | 32,468 | 29,428
Estimated Fair Value | Idaho Power Company |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | [1] | 3,270,200 | 2,807,803
Debt Securities, Held-to-Maturity, Fair Value | [1] | $ 32,468 | $ 29,428
[1] | Notes receivable are categorized as Level 3 and held-to-maturity securities and long-term debt are categorized as Level 2 of the fair value hierarchy, as defined earlier in this Note 17 - "Fair Value Measurements."

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