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REVENUES: Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Oct. 01, 2025
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 1,746,972 $ 1,768,881 $ 1,639,612  
Regulatory Liabilities (1,052,151) (984,326)    
Regulatory Assets 1,564,458 1,507,372    
Retail revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 1,556,358 1,552,780 1,472,666  
Idaho Fixed Cost Adjustment [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers [1] (3,896) 2,856 (38,571)  
Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 35,810 32,583 29,791  
Wholesale energy sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 55,989 73,908 63,421  
Transmission services (wheeling)        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 72,231 79,173 80,357  
Energy efficiency program revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 30,480 27,581 31,948  
Residential Retail Revenue | Retail revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers [1] 708,126 700,586 684,649  
Residential Retail Revenue | Idaho Fixed Cost Adjustment [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers [1] 3,972 (2,686) 37,233  
Commercial Retail Revenue | Retail revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers [1] 394,313 397,385 378,330  
Commercial Retail Revenue | Idaho Fixed Cost Adjustment [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers [1] (76) (170) 1,338  
Industrial Retail Revenue | Retail revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 270,571 267,211 244,538  
Irrigation Retail Revenue | Retail revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 198,468 196,401 173,929  
Deferred revenue-AFUDC | Retail revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers [2] (15,120) (8,803) $ (8,780)  
IPUC authorized AFUDC Collection HCC Relicensing - Gross | Idaho Power Company | Hells Canyon Complex        
Disaggregation of Revenue [Line Items]        
Regulatory Liabilities   $ (8,800)   $ (38,500)
Energy efficiency regulatory asset | IDAHO        
Disaggregation of Revenue [Line Items]        
Regulatory Liabilities (13,400)      
Energy efficiency regulatory asset | OREGON        
Disaggregation of Revenue [Line Items]        
Regulatory Liabilities $ (3,100)      
[1] The FCA mechanism is an alternative revenue program in the Idaho jurisdiction and does not represent revenue from contracts with customers.
[2] The IPUC allows Idaho Power to recover a portion of the AFUDC on construction work in progress related to the HCC relicensing process in its Idaho jurisdiction, even though the relicensing process is not yet complete and the costs have not been moved to utility plant in service. Effective October 1, 2025, Idaho Power began collecting $38.5 million annually. Prior to October 1, 2025, Idaho Power collected $8.8 million annually. For more information refer to Note 3 - "Regulatory Matters." Amounts collected in the Idaho jurisdiction are recognized as deferred revenue until the license is issued and the accumulated license costs approved for recovery are placed in service.