CHANGES IN IDAHO POWER RETAINED EARNINGS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Retained Earnings Roll Forward [Roll Forward]
Balance at beginning of period	$ 1,833,580
Net Income Attributable to IDACORP, Inc.	46,260	$ 44,831
Dividends to parent	(38,371)	(36,379)
Balance at end of period	1,841,644
Idaho Power Company [Member]
Retained Earnings Roll Forward [Roll Forward]
Balance at beginning of period	1,696,304	1,599,155
Net Income Attributable to IDACORP, Inc.	46,214	44,369
Dividends to parent	(38,198)	(35,941)
Balance at end of period	$ 1,704,320	$ 1,607,583