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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenues $ 1,766,356 $ 1,643,981 $ 1,458,084
Electric utility revenues 1,762,894 1,641,040 1,455,410
Operating income 313,477 327,178 329,651
Other income, net 51,378 33,689 21,105
Interest income 28,365 14,401 7,292
Earnings of unconsolidated equity-method investments 12,426 11,511 11,435
Interest on long-term debt 116,457 89,375 86,698
Income before income taxes 289,189 297,404 282,784
Income tax expense (benefit) 27,296 37,844 36,912
Income attributable to IDACORP, Inc. 261,195 258,982 245,550
Total assets 8,475,918 7,543,258 7,210,515
Segment, Expenditure, Addition to Long-Lived Assets 611,137 432,589 299,999
Consolidation, Eliminations      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Operating income 0 0 0
Other income, net 0 0 0
Interest income (2,832) (931) (47)
Earnings of unconsolidated equity-method investments 0 0 0
Interest on long-term debt (2,832) (931) (47)
Income before income taxes 0 0 0
Income tax expense (benefit) 0 0 0
Income attributable to IDACORP, Inc. 0 0 0
Total assets (76,294) (113,608) (62,323)
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 $ 1,762,894 1,641,040 1,455,410
Operating income 313,379 327,170 329,568
Other income, net 51,424 33,876 21,243
Interest income 26,509 12,556 7,123
Earnings of unconsolidated equity-method investments 10,540 10,211 10,211
Interest on long-term debt 116,117 89,038 86,663
Income before income taxes 285,736 294,775 281,482
Income tax expense (benefit) 28,926 39,908 38,257
Income attributable to IDACORP, Inc. 256,810 254,867 243,225
Total assets 8,323,531 7,411,104 6,990,839
Segment, Expenditure, Addition to Long-Lived Assets 610,913 432,430 299,972
All Other | Idaho Power      
Segment Reporting Information [Line Items]      
Revenues 3,462 2,941 2,674
Operating income 98 8 83
Other income, net (46) (187) (138)
Interest income 4,688 2,776 216
Earnings of unconsolidated equity-method investments 1,886 1,300 1,224
Interest on long-term debt 3,172 1,268 82
Income before income taxes 3,453 2,629 1,302
Income tax expense (benefit) (1,630) (2,064) (1,345)
Income attributable to IDACORP, Inc. 4,385 4,115 2,325
Total assets 228,681 245,762 281,999
Segment, Expenditure, Addition to Long-Lived Assets $ 224 $ 159 $ 27