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REVENUES: Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ 1,639,612 $ 1,557,974 $ 1,382,653
Regulatory Liabilities (882,553) (860,601)  
Regulatory Assets 1,653,050 1,501,961  
Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,472,666 1,372,758 1,252,335
Idaho Fixed Cost Adjustment [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers [1] (38,571) (23,517) (36,242)
Other revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 29,791 28,490 27,804
Wholesale energy sales      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 63,421 66,519 40,839
Transmission services (wheeling)      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 80,357 80,527 67,997
Energy efficiency program revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 31,948 33,197 29,920
Residential Retail Revenue | Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 684,649 645,236 583,061
Residential Retail Revenue | Idaho Fixed Cost Adjustment [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers [1] 37,233 22,595 34,835
Commercial Retail Revenue | Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 378,330 347,970 314,745
Commercial Retail Revenue | Idaho Fixed Cost Adjustment [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers [1] 1,338 922 1,407
Industrial Retail Revenue | Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 244,538 217,368 195,214
Irrigation Retail Revenue | Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 173,929 170,964 168,664
Settlement agreement sharing mechanism | Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0 0 (569)
Deferred revenue-AFUDC | Retail revenues      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers [2] (8,780) (8,780) $ (8,780)
IPUC authorized AFUDC Collection HCC Relicensing - Gross | Idaho Power Company | Hells Canyon Complex      
Disaggregation of Revenue [Line Items]      
Regulatory Liabilities (8,800)    
Energy efficiency regulatory asset | IDAHO      
Disaggregation of Revenue [Line Items]      
Regulatory Liabilities (700)    
Energy efficiency regulatory asset      
Disaggregation of Revenue [Line Items]      
Regulatory Assets [3] 0 $ 3,767  
Energy efficiency regulatory asset | OREGON      
Disaggregation of Revenue [Line Items]      
Regulatory Assets $ 800    
[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, even though the relicensing process is not yet complete and the costs have not been moved to electric plant in service. Idaho Power is collecting $8.8 million annually in the Idaho jurisdiction but is deferring revenue recognition of the amounts collected until the license is issued and the accumulated license costs approved for recovery are placed in service.
[3]     The energy efficiency asset and liability represent the separate Idaho and Oregon jurisdiction balances at December 31, 2022, and December 31, 2023, respectively. During 2023, the balances changed from an asset to a liability in the Idaho jurisdiction.