Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Activities:
Net Income	$ 200,419	$ 186,255
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	132,026	129,393
Deferred income taxes and investment tax credits	(2,963)	(7,399)
Changes in regulatory assets and liabilities	(11,616)	22,549
Pension and postretirement benefit plan expense	21,731	20,857
Contributions to pension and postretirement benefit plans	(44,138)	(46,001)
Earnings of equity-method investments	(8,963)	(9,545)
Distributions from equity-method investments	7,300	19,000
Allowance for equity funds used during construction	(21,791)	(19,857)
Other non-cash adjustments to net income, net	7,943	5,785
Change in:
Accounts receivable	(31,215)	(24,798)
Accounts payable and other accrued liabilities	(19,947)	(31,645)
Taxes accrued/receivable	44,515	45,600
Other current assets	8,938	3,618
Other current liabilities	5,128	(3,941)
Other assets	(2,768)	(3,477)
Other liabilities	(569)	621
Net cash provided by operating activities	284,030	287,015
Investing Activities:
Additions to property, plant and equipment	(213,400)	(198,871)
Payments received from transmission project joint funding partners	2,451	1,709
Investments in affordable housing	11,619	2,687
Payments to Acquire Available-for-sale Securities, Equity	3,401	682
Payments to Acquire Short-term Investments	25,000	0
Proceeds from the sale of equity securities	4,015	3,827
Other	4,862	4,121
Net cash used in investing activities	(242,092)	(192,583)
Financing Activities:
Issuance of long-term debt	310,000	166,100
Premium on issuance of long-term debt	31,384	0
Repayments of Long-term Debt	175,000	166,100
Dividends on common stock	(101,999)	(95,871)
Payment, Tax Withholding, Share-based Payment Arrangement	4,641	4,120
Payment for Debt Extinguishment or Debt Prepayment Cost	3,305	0
Other	(3,613)	(1,362)
Net cash (used in) provided by financing activities	52,826	(101,353)
Net increase (decrease) in cash and cash equivalents	94,764	(6,921)
Cash and cash equivalents at beginning of the period	217,254	267,492
Cash and cash equivalents at end of the period	312,018	260,571
Supplemental Disclosure of Cash Flow Information:
Income taxes	2,435	5,225
Interest (net of amount capitalized)	64,630	65,835
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	34,696	23,214
Idaho Power Company
Operating Activities:
Net Income	196,089	180,740
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	131,567	128,945
Deferred income taxes and investment tax credits	7,554	(6,911)
Changes in regulatory assets and liabilities	(11,616)	22,549
Pension and postretirement benefit plan expense	21,716	20,841
Contributions to pension and postretirement benefit plans	(44,123)	(45,984)
Earnings of equity-method investments	(7,368)	(7,365)
Distributions from equity-method investments	6,500	18,150
Allowance for equity funds used during construction	(21,791)	(19,857)
Other non-cash adjustments to net income, net	2,264	(759)
Change in:
Accounts receivable	(33,365)	(24,760)
Accounts payable and other accrued liabilities	2,658	(31,563)
Taxes accrued/receivable	24,159	34,351
Other current assets	8,942	3,611
Other current liabilities	5,207	(3,881)
Other assets	(2,800)	(3,478)
Other liabilities	(481)	658
Net cash provided by operating activities	285,112	265,287
Investing Activities:
Additions to property, plant and equipment	(213,400)	(198,871)
Payments received from transmission project joint funding partners	2,451	1,709
Payments to Acquire Available-for-sale Securities	(3,401)	(682)
Proceeds from the sale of equity securities	4,015	3,827
Other	4,833	3,964
Net cash used in investing activities	(205,502)	(190,053)
Financing Activities:
Issuance of long-term debt	310,000	166,100
Premium on issuance of long-term debt	31,384	0
Repayments of Long-term Debt	175,000	166,100
Dividends on common stock	(101,898)	(95,919)
Payment for Debt Extinguishment or Debt Prepayment Cost	3,305	0
Other	(3,579)	(1,284)
Net cash (used in) provided by financing activities	57,602	(97,203)
Net increase (decrease) in cash and cash equivalents	137,212	(21,969)
Cash and cash equivalents at beginning of the period	98,950	165,460
Cash and cash equivalents at end of the period	236,162	143,491
Supplemental Disclosure of Cash Flow Information:
Income taxes	(9,189)	16,014
Interest (net of amount capitalized)	64,613	65,796
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 34,696	$ 23,214