INCOME TAXES: Income Taxes Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosures
Unrecognized Tax Benefits	$ 0		$ 0
Tax method change – capitalized repairs		$ (11,100)	0	$ (24,516)	$ 4,583
IDACORP
Income Tax Disclosures
Alternative minimum tax credit carryforward	700		700
Years prior to 2014
Income Tax Disclosures
Tax method change – capitalized repairs	(8,800)
General Business Tax Credit Carryforward [Member] | IDACORP
Income Tax Disclosures
Additional ADITC amortization available for use	108,700		108,700
Investment Tax Credit Carryforward [Member] | IDACORP
Income Tax Disclosures
Additional ADITC amortization available for use	$ 37,900		$ 37,900