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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
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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."

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