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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."