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REGULATORY MATTERS: Idaho Base Rate Changes (Details) - USD ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Jun. 01, 2022
Dec. 31, 2024
May 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
May 31, 2025
Jan. 01, 2024
Jan. 01, 2023
May 31, 2018
Idaho Base Rate Changes [Line Items]                    
Net income attributable to IDACORP, Inc.       $ 261,195 $ 258,982 $ 245,550        
Revenue from contracts with customers       1,639,612 1,557,974 1,382,653        
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount       5,451 3,119 2,866        
Idaho Power Company                    
Idaho Base Rate Changes [Line Items]                    
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount       5,451 $ 3,119 $ 2,866        
May 2018 Tax Reform Settlement Stipulation | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
PublicUtilitiesRequestedRateremove cap of ADITC   $ (25,000)                
2023 Rate Case | Subsequent Event | Idaho Power Company                    
Idaho Base Rate Changes [Line Items]                    
Public Utilities, Requested Rate Increase (Decrease), Amount   3,500                
2023 Rate Case | Wildfire mitigation plan costs | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Public Utilities, Requested Rate Increase (Decrease), Amount   26,700                
2023 Rate Case | Benefit Obligations [Member] | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Public Utilities, Requested Rate Increase (Decrease), Amount   18,000                
Idaho PCA includes power supply and deferral balance. | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Approved Rate Increase (Decrease), Amount             $ 190,200      
Idaho Jurisdiction Fixed Cost Adjustment | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Public Utilities, Requested Rate Increase (Decrease), Amount     $ 10,100              
Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism                    
Idaho Base Rate Changes [Line Items]                    
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount       0            
IDAHO | Jim Bridger Plant                    
Idaho Base Rate Changes [Line Items]                    
Approved Rate Increase (Decrease), Percentage 1.50%                  
Approved Rate Increase (Decrease), Amount $ 18,800                  
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount $ 27,100                  
Public Utilities, Requested Rate Increase (Decrease), Percentage 2.10%                  
IDAHO | May 2018 Tax Reform Settlement Stipulation                    
Idaho Base Rate Changes [Line Items]                    
Percentage to be Shared with Customers                   80.00%
Percentage to be Shared with Entity                   20.00%
Authorized Return on Equity in Rate Case, Minimum                   9.40%
Amortization of Regulatory Asset       7,400            
Investment Tax Credits Maximum In One Year In Rate Case                   $ 25,000
Authorized Return on Equity in Rate Case, Mid-point                   10.00%
Authorized Return on Equity in Rate Case, Maximum                   10.50%
IDAHO | May 2018 Tax Reform Settlement Stipulation | Annual recurring                    
Idaho Base Rate Changes [Line Items]                    
Approved Rate Increase (Decrease), Amount       $ (18,700)            
IDAHO | 2023 Rate Case                    
Idaho Base Rate Changes [Line Items]                    
Percentage to be Shared with Customers                   80.00%
Percentage to be Shared with Entity                   20.00%
Authorized Energy Efficiency Rider Rate                 3.10%  
IDAHO | 2023 Rate Case | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Authorized Return on Equity in Rate Case, Minimum               9.12%    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ (54,700)                
Public Utilities, Requested Rate Increase (Decrease), Percentage   9.60%                
Authorized Return on Equity in Rate Case, Mid-point               9.60%    
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage   4.25%                
Authorized Energy Efficiency Rider Rate               2.35%    
IDAHO | 2023 Rate Case | Subsequent Event | Cost of Capital and Capital Structure                    
Idaho Base Rate Changes [Line Items]                    
Total Retail Rate Base               $ 3,800,000    
Public Utilities, Requested Rate Increase (Decrease), Percentage   7.247%                
IDAHO | 2023 Rate Case | Idaho Power Cost Adjustment | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ (168,300)                
IDAHO | Idaho PCA includes power supply and deferral balance. | Subsequent Event                    
Idaho Base Rate Changes [Line Items]                    
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount   $ (484,900)