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FAIR VALUE MEASUREMENTS: Fair Value Measurements Level 4 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, All Levels Transfers, Amount |  | $ 0 | $ 0
Money market funds | [1] | $ 32,472,000 | 16,505,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other |
Asset derivatives |  | $ 89,000 | 40,918,000
Equity Securities, FV-NI |  | $ 37,320,000 | 34,129,000
Derivatives |  | Other |
Liability derivatives |  | $ 5,932,000 | 6,788,000
Fair Value, Inputs, Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds | [1] | 32,472,000 | 16,505,000
Asset derivatives |  | 89,000 | 40,518,000
Equity Securities, FV-NI |  | 37,320,000 | 34,129,000
Other Assets, Fair Value Disclosure | [1] | 0 | 0
Liability derivatives |  | 3,932,000 | 2,937,000
Fair Value, Inputs, Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds | [1] | 0 | 0
Asset derivatives |  | 0 | 400,000
Equity Securities, FV-NI |  | 0 | 0
Other Assets, Fair Value Disclosure | [1] | 0 | 0
Liability derivatives |  | 2,000,000 | 3,851,000
Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds | [1] | 0 | 0
Asset derivatives |  | 0 | 0
Equity Securities, FV-NI |  | 0 | 0
Other Assets, Fair Value Disclosure | [1] | 0 | 0
Liability derivatives |  | 0 | 0
Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Assets, Fair Value Disclosure | [1] | 3,751,000 | 2,796,000
Idaho Power Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds |  | 230,600,000 | 34,468,000
Idaho Power Company | Fair Value, Inputs, Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds |  | 230,600,000 | 34,468,000
Idaho Power Company | Fair Value, Inputs, Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds |  | 0 | 0
Idaho Power Company | Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds |  | $ 0 | $ 0
[1] | Holding company only. Does not include amounts held by Idaho Power.

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