REGULATORY MATTERS: Level 4 (Details) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended				12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism	Dec. 31, 2013 Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism	Dec. 31, 2012 Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism	Dec. 27, 2011 Settlement Stipulation - Investment Tax Credits and Idaho Sharing Mechanism	Jun. 30, 2014 Idaho Power Cost Adjustment Mechanism; Update to Base Level Net Power Supply Expense	Jun. 30, 2014 Idaho Power Cost Adjustment Mechanism; Update to Base Level Net Power Supply Expense	Dec. 31, 2013 Idaho Power Cost Adjustment Mechanism; Update to Base Level Net Power Supply Expense	Jun. 30, 2014 Annual Idaho Fixed Cost Adjustment Filing	Jun. 01, 2014 Annual Idaho Fixed Cost Adjustment Filing	Jun. 01, 2013 Annual Idaho Fixed Cost Adjustment Filing	Jun. 01, 2012 Annual Idaho Fixed Cost Adjustment Filing	Dec. 31, 2012 IDAHO Idaho and Oregon General Rate Cases and Base Rate Adjustments	Jan. 02, 2012 IDAHO Idaho and Oregon General Rate Cases and Base Rate Adjustments	Dec. 31, 2012 IDAHO Cost Recovery for Langley Gulch Power Plant	Jun. 29, 2012 IDAHO Cost Recovery for Langley Gulch Power Plant	Dec. 31, 2012 OREGON Idaho and Oregon General Rate Cases and Base Rate Adjustments	Mar. 01, 2012 OREGON Idaho and Oregon General Rate Cases and Base Rate Adjustments	Dec. 31, 2012 OREGON Cost Recovery for Langley Gulch Power Plant	Jul. 02, 2014 Subsequent Event IPUC Review of Rate Adjustment Mechanisms	Jun. 30, 2014 Idaho Power Company	Mar. 31, 2014 Idaho Power Company	Jun. 30, 2013 Idaho Power Company	Jun. 30, 2014 Idaho Power Company	Jun. 30, 2013 Idaho Power Company
Rate Case
Authorized Rate of Return in Rate Case																	7.86%				7.757%
Total Retail Rate Base																	$ 2,360,000,000
Approved Rate Increase (Decrease), Amount									11,100,000	106,000,000	140,400,000	6,000,000				34,000,000		58,100,000		1,800,000		3,000,000
Public Utilities, Approved Return on Equity, Percentage																				9.90%
Increase (Decrease) in Rate Base																			335,900,000
Authorized Return on Equity in Rate Case, Minimum								9.50%
Authorized Return on Equity in Rate Case, Mid-point								10.00%
Authorized Return on Equity in Rate Case, Maximum								10.50%
Investment Tax Credits, Maximum, in Rate Case								45,000,000
Period of Current ADITC Stipulation					3 years
Percentage to be Shared with Customers								75.00%
Percentage to be Shared with Entity								25.00%
Additional Pension Amortization As Result Of Idaho Settlement Stipulation						16,500,000	14,600,000
Regulatory Liabilities						7,600,000	7,200,000				20,000,000
Increase (Decrease) in Regulatory Assets and Liabilities			(29,513,000)	24,727,000		24,100,000	21,800,000																				(29,513,000)	24,727,000
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount	(950,000)	0																						(950,000)	(950,000)	0
Annual fixed cost adjustment mechanism deferral													14,900,000	8,900,000	10,300,000
PCA Rate Review																							$ 14,200,000