v3.26.3
FAIR VALUE MEASUREMENTS: Level 4 (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] $ 19,893 $ 62,012
Derivative Assets 484 3
Equity Securities, FV-NI 33,796 38,448
Derivative Liabilities 17,505 19,719
Idaho Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 76,840 110,602
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] 19,893 62,012
Derivative Assets 484 0
Equity Securities, FV-NI 33,796 38,448
Assets, Fair Value Disclosure [1] 0 0
Derivative Liabilities 6,795 8,186
Fair Value, Inputs, Level 1 [Member] | Idaho Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 76,840 110,602
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] 0 0
Derivative Assets 0 3
Equity Securities, FV-NI 0 0
Assets, Fair Value Disclosure [1] 0 0
Derivative Liabilities 10,710 11,533
Fair Value, Inputs, Level 2 [Member] | Idaho Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] 0 0
Derivative Assets 0 0
Equity Securities, FV-NI 0 0
Assets, Fair Value Disclosure [1] 0 0
Derivative Liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Idaho Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 0
Fair Value Measured at Net Asset Value Per Share    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure [1] $ 7,739 $ 5,948
[1] Holding company only. Does not include amounts held by Idaho Power.