Condensed Consolidated Statements of Capitalization Statement (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Common Stock Equity:
Common stock	$ 820,271	$ 807,842
Retained earnings	846,873	733,879
Accumulated other comprehensive loss	(10,268)	(9,568)
Total equity	1,660,888	1,535,984
Pollution control revenue bonds:
Total long-term debt	1,487,468	1,488,287
Idaho Power Company
Common Stock Equity:
Common stock	97,877	97,877
Premium on capital stock	688,758	688,758
Capital stock expense	(2,097)	(2,097)
Retained earnings	740,911	630,259
Accumulated other comprehensive loss	(10,268)	(9,568)
Total equity	1,515,181	1,405,229
First mortgage bonds:
Total first mortgage bonds	1,295,000	1,415,000
Amount due within one year	0	(120,000)
First mortgage bonds	1,295,000	1,295,000
Pollution control revenue bonds:
5.15% Series due 2024	49,800	49,800
5.25% Series due 2026	116,300	116,300
Variable Rate Series 2000 due 2027	4,360	4,360
Total pollution control revenue bonds	170,460	170,460
American Falls bond guarantee	19,885	19,885
Milner Dam note guarantee	6,382	7,446
Note guarantee due within one year	(1,064)	(1,064)
Unamortized premium/discount - net	(3,195)	(3,440)
Total long-term debt	1,487,468	1,488,287
Total capitalization	3,002,649	2,893,516
Idaho Power Company | 6.60% Series due 2011
First mortgage bonds:
First mortgage bonds	0	120,000
Idaho Power Company | 4.75% Series due 2012
First mortgage bonds:
First mortgage bonds	100,000	100,000
Idaho Power Company | 4.25% Series due 2013
First mortgage bonds:
First mortgage bonds	70,000	70,000
Idaho Power Company | 6.025% Series due 2018
First mortgage bonds:
First mortgage bonds	120,000	120,000
Idaho Power Company | 6.15% Series due 2019
First mortgage bonds:
First mortgage bonds	100,000	100,000
Idaho Power Company | 4.50% Series due 2020
First mortgage bonds:
First mortgage bonds	130,000	130,000
Idaho Power Company | 3.40% Series due 2020
First mortgage bonds:
First mortgage bonds	100,000	100,000
Idaho Power Company | 6.00% Series due 2032
First mortgage bonds:
First mortgage bonds	100,000	100,000
Idaho Power Company | 5.50% Series due 2033
First mortgage bonds:
First mortgage bonds	70,000	70,000
Idaho Power Company | 5.50% Series due 2034
First mortgage bonds:
First mortgage bonds	50,000	50,000
Idaho Power Company | 5.875% Series due 2034
First mortgage bonds:
First mortgage bonds	55,000	55,000
Idaho Power Company | 5.30% Series due 2035
First mortgage bonds:
First mortgage bonds	60,000	60,000
Idaho Power Company | 6.30% Series due 2037
First mortgage bonds:
First mortgage bonds	140,000	140,000
Idaho Power Company | 6.25% Series due 2037
First mortgage bonds:
First mortgage bonds	100,000	100,000
Idaho Power Company | 4.85% Series due 2040
First mortgage bonds:
First mortgage bonds	$ 100,000	$ 100,000