Consolidated Statements of Retained Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retained Earnings [Roll Forward]
Balance at beginning of year	$ 1,531,543	$ 1,426,528	$ 1,323,198
Net Income	233,328	227,523	213,188
Dividends on Common Stock	(129,872)	(121,786)	(113,181)
Balance at end of year	1,634,525	1,531,543	1,426,528
Idaho Power Company
Retained Earnings [Roll Forward]
Balance at beginning of year	1,409,245	1,308,702	1,211,547
Net Income	224,437	222,334	206,347
Dividends on Common Stock	(129,877)	(121,791)	(113,284)
Cumulative effect of accounting change	0	0	4,092
Balance at end of year	$ 1,503,805	$ 1,409,245	$ 1,308,702