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FAIR VALUE MEASUREMENTS: Fair Value Carrying Amounts and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable [1] $ 3,038 $ 3,871
Long-term debt [1] 2,825,590 2,194,145
Debt Securities, Held-to-Maturity, Fair Value [1] 31,639 30,475
Carrying Amount | Idaho Power Company    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] 2,825,590 2,194,145
Debt Securities, Held-to-Maturity, Fair Value [1] 31,639 30,475
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable [1] 3,038 3,871
Long-term debt [1] 2,684,278 1,953,470
Debt Securities, Held-to-Maturity, Fair Value [1] 28,341 25,452
Estimated Fair Value | Idaho Power Company    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] 2,684,278 1,953,470
Debt Securities, Held-to-Maturity, Fair Value [1] $ 28,341 $ 25,452
[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 16 - "Fair Value Measurements."