v3.26.3
INCOME TAXES: Level 4 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Tax Expense [Line Items]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount     $ 87,206 $ 67,179
Excess deferred income tax reversal     (4,872) (7,293)
Income tax return adjustments     (13,503) (8,046)
Other [1]     (44,933) (24,300)
Income tax expense before additional ADITC amortization     23,898 27,540
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount     (6,250) (39,000)
Income Tax Expense $ 3,007 $ 7,686 $ 17,648 $ (11,460)
Effective tax rate     5.10% (4.30%)
Tax Jurisdiction of Domicile [Extensible Enumeration]     UNITED STATES UNITED STATES
Idaho Power Company        
Income Tax Expense [Line Items]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount     $ 86,349 $ 65,335
Excess deferred income tax reversal     (4,872) (7,293)
Income tax return adjustments     (13,728) (8,581)
Other [1]     (42,572) (22,545)
Income tax expense before additional ADITC amortization     25,177 26,916
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount     (6,250) (39,000)
Income Tax Expense $ 3,163 $ 7,321 $ 18,927 $ (12,084)
Effective tax rate     5.50% (4.60%)
[1] "Other" primarily consists of the net tax effect of Idaho Power's regulatory flow-through tax adjustments.
Supplemental Disclosure of Cash Flow Information

Supplemental cash flow information related to income taxes, including cash (refunded) paid for income taxes and cash received from IDACORP related to income taxes, is presented below (in thousands of dollars):
Nine months ended
September 30,
20262025
IDACORP
Total cash (refunded) paid for income taxes$(3,374)$5,790 
Idaho Power
Total cash received from IDACORP related to income taxes$(2,443)$(21,600)