v3.26.3
SEGMENT INFORMATION: Level 4 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting          
Total operating revenues $ 608,036 $ 524,417 $ 1,481,246 $ 1,407,754  
Depreciation 71,928 64,493 203,790 185,407  
Other income, net 24,047 19,289 71,697 55,056  
Other Interest and Dividend Income 7,855 10,884 23,634 33,703  
Earnings of unconsolidated equity-method investments 2,279 2,185 4,268 4,208  
Interest Expense, Operating and Nonoperating 49,470 44,884 141,034 124,354  
Income Tax Expense (Benefit) 3,007 7,686 17,648 (11,460)  
Net Income Attributable to IDACORP, Inc. 160,213 124,437 330,771 279,865  
Segment Reporting, Long-Lived Asset, Expenditure for Addition 369,791 290,723 1,177,826 825,352  
Total assets 11,370,346   11,370,346   $ 10,225,437
Eliminations          
Segment Reporting          
Total operating revenues 0 0 0 0  
Depreciation 0 0 0 0  
Other income, net 0 0 0 0  
Other Interest and Dividend Income (605) (761) (1,779) (2,275)  
Earnings of unconsolidated equity-method investments 0 0 0 0  
Interest Expense, Operating and Nonoperating (605) (761) (1,779) (2,275)  
Income Tax Expense (Benefit) 0 0 0 0  
Net Income Attributable to IDACORP, Inc. 0 0 0 0  
Segment Reporting, Long-Lived Asset, Expenditure for Addition 0 0 0 0  
Total assets (137,657)   (137,657)    
Idaho Power Company | Operating Segments          
Segment Reporting          
Total operating revenues 607,037 523,549 1,478,472 1,405,173  
Depreciation 71,928 64,493 203,790 185,407  
Other income, net 23,977 19,196 71,450 55,200  
Other Interest and Dividend Income 7,505 8,967 21,890 27,541  
Earnings of unconsolidated equity-method investments 1,228 996 2,650 2,150  
Interest Expense, Operating and Nonoperating 49,390 44,796 140,817 124,019  
Income Tax Expense (Benefit) 3,163 7,321 18,927 (12,084)  
Net Income Attributable to IDACORP, Inc. 158,136 122,156 326,071 273,121  
Segment Reporting, Long-Lived Asset, Expenditure for Addition 369,770 290,600 1,177,537 825,100  
Total assets 11,308,019   11,308,019    
Other Operating Segment | Operating Segments          
Segment Reporting          
Total operating revenues 999 868 2,774 2,581  
Depreciation 0 0 0 0  
Other income, net 70 93 247 (144)  
Other Interest and Dividend Income 955 2,678 3,523 8,437  
Earnings of unconsolidated equity-method investments 1,051 1,189 1,618 2,058  
Interest Expense, Operating and Nonoperating 685 849 1,996 2,610  
Income Tax Expense (Benefit) (156) 365 (1,279) 624  
Net Income Attributable to IDACORP, Inc. 2,077 2,281 4,700 6,744  
Segment Reporting, Long-Lived Asset, Expenditure for Addition 21 $ 123 289 $ 252  
Total assets $ 199,984   $ 199,984