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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 1,812,997 $ 1,826,633 $ 1,766,356
Electric utility revenues 1,809,609 1,822,965 1,762,894
Depreciation 251,072 223,410 195,341
Operating income 353,976 327,839 313,477
Other income, net 76,516 64,006 51,378
Interest income 43,195 44,485 28,365
Earnings of unconsolidated equity-method investments 4,922 4,539 12,426
Interest on long-term debt 168,191 135,865 116,457
Income before income taxes 310,418 305,004 289,189
Income tax expense (benefit) (13,715) 15,053 27,296
Income attributable to IDACORP, Inc. 323,472 289,174 261,195
Total assets 10,225,437 9,239,363 8,475,918
Segment, Expenditure, Addition to Long-Lived Assets 1,179,327 1,009,279 611,137
Consolidation, Eliminations      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Depreciation 0 0 0
Operating income 0 0 0
Other income, net 0 0 0
Interest income (2,971) (3,244) (2,832)
Earnings of unconsolidated equity-method investments 0 0 0
Interest on long-term debt (2,971) (3,244) (2,832)
Income before income taxes 0 0 0
Income tax expense (benefit) 0 0 0
Income attributable to IDACORP, Inc. 0 0 0
Total assets (72,977) (77,892) (76,294)
Segment, Expenditure, Addition to Long-Lived Assets $ 0 0 0
Idaho Power Company      
Segment Reporting Information [Line Items]      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 33.00%    
Idaho Power Company | Idaho Power      
Segment Reporting Information [Line Items]      
Electric utility revenues $ 1,809,609 1,822,965 1,762,894
Depreciation 251,072 223,410 195,341
Operating income 355,417 328,183 313,379
Other income, net 76,700 64,309 51,424
Interest income 35,337 38,639 26,509
Earnings of unconsolidated equity-method investments 2,984 2,671 10,540
Interest on long-term debt 167,753 135,516 116,117
Income before income taxes 302,685 298,286 285,736
Income tax expense (benefit) (13,177) 17,681 28,926
Income attributable to IDACORP, Inc. 315,862 280,605 256,810
Total assets 10,036,896 8,966,968 8,323,531
Segment, Expenditure, Addition to Long-Lived Assets 1,178,990 1,009,138 610,913
All Other | Idaho Power      
Segment Reporting Information [Line Items]      
Revenues 3,388 3,668 3,462
Depreciation 0 0 0
Operating income (1,441) (344) 98
Other income, net (184) (303) (46)
Interest income 10,829 9,090 4,688
Earnings of unconsolidated equity-method investments 1,938 1,868 1,886
Interest on long-term debt 3,409 3,593 3,172
Income before income taxes 7,733 6,718 3,453
Income tax expense (benefit) (538) (2,628) (1,630)
Income attributable to IDACORP, Inc. 7,610 8,569 4,385
Total assets 261,518 350,287 228,681
Segment, Expenditure, Addition to Long-Lived Assets $ 337 $ 141 $ 224