CHANGES IN IDAHO POWER RETAINED EARNINGS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in Retained Earnings [Line Items]
Balance at beginning of period	$ 1,742,994	$ 1,638,065	$ 1,734,103	$ 1,634,525
Net Income	70,274	60,659	115,074	98,117
Dividends to parent			(72,285)	(68,160)
Common stock dividends	(36,031)	(33,986)	(71,971)	(67,936)
Balance at end of period	1,776,986	1,664,468	1,776,986	1,664,468
Net Income Attributable to IDACORP, Inc.	70,023	60,389	114,854	97,879
Idaho Power Company
Changes in Retained Earnings [Line Items]
Dividends to parent				(67,939)
Net Income Attributable to IDACORP, Inc.	68,822	58,923	113,191	95,700
Idaho Power Company
Changes in Retained Earnings [Line Items]
Balance at beginning of period	1,607,583	1,506,629	1,599,155	1,503,805
Net Income	68,822	58,923	113,191	95,700
Dividends to parent	(36,031)	(33,986)	(71,972)	(67,939)
Balance at end of period	$ 1,640,374	$ 1,531,566	$ 1,640,374	$ 1,531,566