Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net Income	$ 83,101	$ 81,916
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	83,912	73,183
Deferred income taxes and investment tax credits	6,828	12,373
Changes in regulatory assets and liabilities	37,736	24,126
Pension and postretirement benefit plan expense	14,513	14,784
Contributions to pension and postretirement benefit plans	(3,920)	(13,415)
Earnings of unconsolidated equity-method investments	(2,037)	(1,325)
Distributions from unconsolidated equity-method investments	8,100	0
Allowance for equity funds used during construction	(10,843)	(10,223)
Other non-cash adjustments to net income, net	3,741	2,096
Change in:
Accounts receivable	(2,758)	404
Accounts payable and other accrued liabilities	(30,677)	(14,711)
Taxes accrued/receivable	18,073	2,620
Other current assets	(16,951)	(34,964)
Other current liabilities	6,948	4,817
Other assets	(3,692)	(2,334)
Other liabilities	(430)	(1,458)
Net cash provided by operating activities	191,644	137,889
Investing Activities:
Additions to property, plant and equipment	(146,341)	(117,160)
Payments received from transmission project joint funding partners	5,787	5,301
Proceeds from the sale of emission allowances and renewable energy certificates	1,839	846
Investments in unconsolidated affiliates	0	4,386
Purchase of available-for-sale securities	(3,165)	(1,209)
Proceeds from the sale of available-for-sale securities	2,428	2,181
Other	212	(36)
Net cash used in investing activities	(139,240)	(114,463)
Financing Activities:
Issuance of long-term debt	0	120,000
Retirement of long-term debt	(1,064)	(101,064)
Dividends on common stock	(55,763)	(51,719)
Net change in short-term borrowings	(21,250)	3,900
Acquisition of treasury stock	(3,174)	(3,275)
Make-whole premium on retirement of long-term debt	0	13,895
Other	(4)	(1,617)
Net cash used in financing activities	(81,255)	(47,670)
Net (decrease) increase in cash and cash equivalents	(28,851)	(24,244)
Cash and cash equivalents at beginning of the period	61,480	114,802
Cash and cash equivalents at end of the period	32,629	90,558
Supplemental Disclosure of Cash Flow Information:
Income taxes	1,202	562
Interest (net of amount capitalized)	39,481	39,993
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	21,410	19,700
Idaho Power Company
Operating Activities:
Net Income	80,863	80,341
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	83,611	72,878
Deferred income taxes and investment tax credits	6,144	11,724
Changes in regulatory assets and liabilities	37,736	24,126
Pension and postretirement benefit plan expense	14,513	14,784
Contributions to pension and postretirement benefit plans	(3,920)	(13,415)
Earnings of unconsolidated equity-method investments	(917)	(407)
Distributions from unconsolidated equity-method investments	8,100	0
Allowance for equity funds used during construction	(10,843)	(10,223)
Other non-cash adjustments to net income, net	(47)	(1,268)
Change in:
Accounts receivable	(9,798)	836
Accounts payable and other accrued liabilities	(1,109)	(14,681)
Taxes accrued/receivable	13,679	8,120
Other current assets	(16,945)	(34,962)
Other current liabilities	6,974	4,832
Other assets	(3,693)	(2,334)
Other liabilities	(275)	(1,245)
Net cash provided by operating activities	204,073	139,106
Investing Activities:
Additions to property, plant and equipment	(146,328)	(117,159)
Payments received from transmission project joint funding partners	5,787	5,301
Proceeds from the sale of emission allowances and renewable energy certificates	1,839	846
Investments in unconsolidated affiliates	0	4,386
Purchase of available-for-sale securities	(3,165)	(1,209)
Proceeds from the sale of available-for-sale securities	2,428	2,181
Other	212	(101)
Net cash used in investing activities	(139,227)	(114,527)
Financing Activities:
Issuance of long-term debt	0	120,000
Retirement of long-term debt	(1,064)	(101,064)
Dividends on common stock	(55,695)	(51,628)
Net change in short-term borrowings	(21,800)	0
Make-whole premium on retirement of long-term debt	0	13,895
Other	0	(1,616)
Net cash used in financing activities	(78,559)	(48,203)
Net (decrease) increase in cash and cash equivalents	(13,713)	(23,624)
Cash and cash equivalents at beginning of the period	44,140	110,756
Cash and cash equivalents at end of the period	30,427	87,132
Supplemental Disclosure of Cash Flow Information:
Income taxes	22,861	4,217
Interest (net of amount capitalized)	39,447	39,856
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 21,410	$ 19,700