INCOME TAXES: Level 4 (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Tax Expense [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount				$ 36,090	$ 36,010
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount				(20,000)	(7,500)
Excess deferred income tax reversal				(5,023)	(5,342)
Other	[1]			(8,550)	(7,942)
Income Tax Expense		$ 8,063	$ 8,131	$ 2,517	$ 15,226
Effective tax rate				1.80%	10.90%
Income tax expense before additional ADITC amortization				$ 22,517	$ 22,726
Idaho Power Company
Income Tax Expense [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount				35,555	35,697
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount				(20,000)	(7,500)
Excess deferred income tax reversal				(5,023)	(5,342)
Other	[1]			(7,091)	(6,961)
Income Tax Expense		$ 8,472	$ 8,284	$ 3,441	$ 15,894
Effective tax rate				2.50%	11.50%
Income tax expense before additional ADITC amortization				$ 23,441	$ 23,394

[1] "Other" primarily consists of the net tax effect of Idaho Power's regulatory flow-through tax adjustments.