Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities:
Net Income	$ 164,934	$ 162,802
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	110,161	106,304
Deferred income taxes and investment tax credits	30,077	25,265
Changes in regulatory assets and liabilities	13,502	25,776
Pension and postretirement benefit plan expense	22,175	22,668
Contributions to pension and postretirement benefit plans	(43,851)	(41,660)
Earnings of unconsolidated equity-method investments	(13,650)	(8,636)
Distributions from unconsolidated equity-method investments	17,114	9,352
Allowance for equity funds used during construction	(16,153)	(16,219)
Other non-cash adjustments to net income, net	3,876	1,444
Change in:
Accounts receivable	(12,435)	(14,704)
Accounts payable and other accrued liabilities	(10,033)	(12,210)
Taxes accrued/receivable	8,490	19,845
Other current assets	7,343	(178)
Other current liabilities	(5,451)	7,874
Other assets	(1,277)	2,468
Other liabilities	595	629
Net cash provided by operating activities	275,417	290,820
Investing Activities:
Additions to property, plant and equipment	(199,966)	(235,890)
Payments received from transmission project joint funding partners	6,853	0
Proceeds from the sale of emission allowances and renewable energy certificates	969	1,855
Purchase of available-for-sale securities	(9,843)	(469)
Proceeds from the sale of available-for-sale securities	14,453	2,724
Purchase of life insurance investment	(10,000)	0
Other	(9)	(1,132)
Net cash used in investing activities	(197,543)	(232,912)
Financing Activities:
Issuance of long-term debt	120,000	250,000
Retirement of long-term debt	(101,064)	(121,064)
Dividends on common stock	(77,350)	(71,225)
Net change in short-term borrowings	(14,600)	(27,700)
Acquisition of treasury stock	(3,287)	(3,277)
Make-whole premium on retirement of long-term debt	(13,895)	(17,872)
Other	(1,684)	(2,318)
Net cash (used in) provided by financing activities	(91,880)	6,544
Net (decrease) increase in cash and cash equivalents	(14,006)	64,452
Cash and cash equivalents at beginning of the period	114,802	56,808
Cash and cash equivalents at end of the period	100,796	121,260
Supplemental Disclosure of Cash Flow Information:
Income taxes	2,187	4,442
Interest (net of amount capitalized)	60,224	57,630
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	21,583	12,606
Idaho Power Company
Operating Activities:
Net Income	160,370	159,528
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	109,704	105,848
Deferred income taxes and investment tax credits	12,679	(5,307)
Changes in regulatory assets and liabilities	13,502	25,776
Pension and postretirement benefit plan expense	22,191	22,646
Contributions to pension and postretirement benefit plans	(43,867)	(41,638)
Earnings of unconsolidated equity-method investments	(11,528)	(6,992)
Distributions from unconsolidated equity-method investments	16,264	8,502
Allowance for equity funds used during construction	(16,153)	(16,219)
Other non-cash adjustments to net income, net	(571)	(969)
Change in:
Accounts receivable	(12,319)	(17,363)
Accounts payable and other accrued liabilities	(10,016)	(11,967)
Taxes accrued/receivable	8,172	27,942
Other current assets	7,326	(189)
Other current liabilities	(5,451)	7,917
Other assets	(1,277)	2,468
Other liabilities	789	800
Net cash provided by operating activities	249,815	260,783
Investing Activities:
Additions to property, plant and equipment	(199,964)	(235,841)
Payments received from transmission project joint funding partners	6,853	0
Proceeds from the sale of emission allowances and renewable energy certificates	969	1,855
Purchase of available-for-sale securities	(9,843)	(469)
Proceeds from the sale of available-for-sale securities	14,453	2,724
Purchase of life insurance investment	(10,000)	0
Other	(108)	(1,372)
Net cash used in investing activities	(197,640)	(233,103)
Financing Activities:
Issuance of long-term debt	120,000	250,000
Retirement of long-term debt	(101,064)	(121,064)
Dividends on common stock	(77,365)	(71,215)
Make-whole premium on retirement of long-term debt	(13,895)	(17,872)
Other	(1,671)	(4,125)
Net cash (used in) provided by financing activities	(73,995)	35,724
Net (decrease) increase in cash and cash equivalents	(21,820)	63,404
Cash and cash equivalents at beginning of the period	110,756	46,695
Cash and cash equivalents at end of the period	88,936	110,099
Supplemental Disclosure of Cash Flow Information:
Income taxes	19,796	28,336
Interest (net of amount capitalized)	60,034	57,457
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 21,583	$ 12,606