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RELATED PARTY TRANSACTIONS: Related Party Transactions Level 4 (Details) - Idaho Power Company - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IDACORP      
Related Party Transaction      
Revenues $ 1.1 $ 0.9 $ 0.8
Idaho Power      
Related Party Transaction      
Accounts Payable 16.2 56.2  
Ida-West      
Related Party Transaction      
Costs and Expenses, Related Party $ 9.1 $ 7.9 $ 8.2