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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.