CHANGES IN IDAHO POWER RETAINED EARNINGS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Changes in Idaho Power Retained Earnings
Balance at beginning of period	$ 1,563,399	$ 1,465,009	$ 1,531,543	$ 1,426,528
Net Income	90,218	102,591	186,255	201,294
Dividends to parent			(95,871)	(89,674)
Common stock dividends	(31,933)	(29,908)	(95,919)	(89,857)
Balance at end of period	1,621,342	1,537,332	1,621,342	1,537,332
Idaho Power Company
Changes in Idaho Power Retained Earnings
Balance at beginning of period	1,438,019	1,345,246	1,409,245	1,308,702
Net Income	87,979	100,194	180,740	196,687
Dividends to parent	(31,932)	(29,908)	(95,919)	(89,857)
Balance at end of period	$ 1,494,066	$ 1,415,532	$ 1,494,066	$ 1,415,532