Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities:
Net Income	$ 157,878	$ 122,219
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	92,646	91,257
Deferred income taxes and investment tax credits	(54,340)	37,095
Changes in regulatory assets and liabilities	55,044	50,338
Pension and postretirement benefit plan expense	17,279	10,474
Contributions to pension and postretirement benefit plans	(20,194)	(64,269)
(Earnings) losses of unconsolidated equity-method investments	3,657	(1,444)
Distributions from unconsolidated equity-method investments	2,375	1,280
Allowance for equity funds used during construction	(18,264)	(11,878)
Other non-cash adjustments to net income, net	3,731	2,104
Change in:
Accounts receivable and prepayments	(12,121)	9,652
Accounts payable and other accrued liabilities	(2,209)	(5,786)
Taxes accrued/receivable	31,472	(34,799)
Other current assets	(24,556)	2,914
Other current liabilities	1,375	21,591
Other assets	4,595	(3,443)
Other liabilities	(3,458)	(4,776)
Net cash provided by operating activities	234,910	222,529
Investing Activities:
Additions to property, plant and equipment	(266,991)	(249,437)
Proceeds from the sale of utility assets	0	18,982
Proceeds from the sale of emission allowances and RECs	5,163	5,399
Investments in affordable housing	(955)	(9,337)
Other	2,435	3,826
Net cash used in investing activities	(260,348)	(230,567)
Financing Activities:
Issuance of long-term debt	0	200,000
Retirement of long-term debt	(121,064)	(1,064)
Dividends on common stock	(44,808)	(43,213)
Net change in short-term borrowings	(15,400)	(49,750)
Issuance of common stock	10,408	38,086
Acquisition of treasury stock	(1,933)	(846)
Other	872	(2,849)
Net cash (used in) provided by financing activities	(171,925)	140,364
Net (decrease) increase in cash and cash equivalents	(197,363)	132,326
Cash and cash equivalents at beginning of the period	228,677	52,987
Cash and cash equivalents at end of the period	31,314	185,313
Cash paid (received) during the period for:
Income taxes	(11,543)	836
Interest (net of amount capitalized)	52,505	47,356
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	22,715	21,551
Investments in affordable housing	0	1,509
Idaho Power Company
Operating Activities:
Net Income	155,420	121,700
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	92,232	90,785
Deferred income taxes and investment tax credits	(56,078)	67,516
Changes in regulatory assets and liabilities	55,044	50,338
Pension and postretirement benefit plan expense	17,279	10,474
Contributions to pension and postretirement benefit plans	(20,194)	(64,269)
(Earnings) losses of unconsolidated equity-method investments	(1,172)	(7,738)
Distributions from unconsolidated equity-method investments	1,075	455
Allowance for equity funds used during construction	(18,264)	(11,878)
Other non-cash adjustments to net income, net	1,383	(729)
Change in:
Accounts receivable and prepayments	(12,213)	8,830
Accounts payable and other accrued liabilities	(2,120)	(5,652)
Taxes accrued/receivable	35,496	(80,853)
Other current assets	(24,556)	2,914
Other current liabilities	1,375	21,590
Other assets	4,595	(3,443)
Other liabilities	(2,702)	(4,206)
Net cash provided by operating activities	226,600	195,834
Investing Activities:
Additions to property, plant and equipment	(266,991)	(249,437)
Proceeds from the sale of utility assets	0	18,982
Proceeds from the sale of emission allowances and RECs	5,163	5,399
Other	1,820	3,274
Net cash used in investing activities	(260,008)	(221,782)
Financing Activities:
Issuance of long-term debt	0	200,000
Retirement of long-term debt	(121,064)	(1,064)
Dividends on common stock	(44,768)	(43,325)
Capital contribution from parent	0	30,000
Other	0	(2,746)
Net cash (used in) provided by financing activities	(165,832)	182,865
Net (decrease) increase in cash and cash equivalents	(199,240)	156,917
Cash and cash equivalents at beginning of the period	224,233	21,625
Cash and cash equivalents at end of the period	24,993	178,542
Cash paid (received) during the period for:
Income taxes	(6,689)	21,815
Interest (net of amount capitalized)	52,148	46,338
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 22,715	$ 21,551