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OTHER INCOME AND EXPENSE Other Income and Expense Level 4 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of other nonoperating income (expense) [Line Items]      
Interest and dividend income, net $ 15,266 $ 5,952 $ 1,408
Carrying charges on regulatory assets 13,099 7,032 5,034
Net periodic benefit cost [1] 6,513 9,196 15,249
Income from life insurance investments 8,384 7,107 5,203
Other Income 6,286 (90) 463
Other (income) expense, net 36,522 10,805 (3,141)
Idaho Power Company      
Schedule of other nonoperating income (expense) [Line Items]      
Interest and dividend income, net 13,410 4,094 1,241
Carrying charges on regulatory assets 13,099 7,032 5,034
Net periodic benefit cost [1] 6,513 9,196 15,240
Income from life insurance investments 8,384 7,012 5,203
Other Income 6,333 205 591
Other (income) expense, net $ 34,713 $ 9,147 $ (3,171)
[1] The 2021 pension and postretirement non-service costs includes $4.7 million of expense for a temporary deviation from the cost-sharing provisions of the substantive postretirement plan as described in Note 11 - "Benefit Plans."