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REGULATORY MATTERS: Idaho Jurisdiction Power Cost Adjustment Mechanism (Details) - USD ($)
 12 Months Ended 24 Months Ended
Jun. 01, 2023
Jun. 01, 2022
Jun. 01, 2021
May 31, 2025
May 31, 2025
Dec. 31, 2023
Dec. 31, 2022
Idaho Power Cost Adjustment Mechanism [Line Items]              
Regulatory Liabilities           $ 882,553,000 $ 860,601,000
Regulatory Assets           1,653,050,000 1,501,961,000
Power supply costs              
Idaho Power Cost Adjustment Mechanism [Line Items]              
Regulatory Assets [1]           $ 115,525,000 129,309,000
Idaho Power Cost Adjustment              
Idaho Power Cost Adjustment Mechanism [Line Items]              
Percentage to be Shared with Customers           95.00%  
Percentage to be Shared with Entity           5.00%  
Approved Rate Increase (Decrease), Amount $ 105,100,000 $ 94,900,000 $ 39,100,000        
Idaho Power Cost Adjustment | Subsequent Event              
Idaho Power Cost Adjustment Mechanism [Line Items]              
Approved Rate Increase (Decrease), Amount       $ 95,100,000 $ 200,200,000    
Idaho PCA includes power supply and deferral balance. | Subsequent Event              
Idaho Power Cost Adjustment Mechanism [Line Items]              
Approved Rate Increase (Decrease), Amount         $ 190,200,000    
Oregon jurisdiction              
Idaho Power Cost Adjustment Mechanism [Line Items]              
Annual Power Cost Update $ 7,700,000 $ 4,000,000 $ 2,400,000        
OREGON | Power supply costs              
Idaho Power Cost Adjustment Mechanism [Line Items]              
Regulatory Assets           $ 900,000 $ 1,100,000
[1] This item is discussed in more detail in this Note 3 - "Regulatory Matters."