Consolidated Statements of Retained Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Retained Earnings [Roll Forward]
Balance at beginning of year	$ 1,132,237	$ 1,027,461	$ 923,981
Net Income	194,475	193,754	182,294
Dividends on Common Stock	(96,811)	(88,704)	(78,937)
Balance at end of year	1,230,105	1,132,237	1,027,461
Idaho Power Company
Retained Earnings [Roll Forward]
Balance at beginning of year	1,033,350	932,547	834,732
Net Income	190,983	189,387	176,741
Dividends on Common Stock	(96,907)	(88,584)	(78,926)
Balance at end of year	$ 1,127,426	$ 1,033,350	$ 932,547