Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net Income	$ 44,800	$ 37,458
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,286	43,666
Deferred income taxes and investment tax credits	(3,390)	(1,379)
Changes in regulatory assets and liabilities	2,833	(9,672)
Pension and postretirement benefit plan expense	7,367	7,260
Contributions to pension and postretirement benefit plans	(918)	(12,270)
Earnings of equity-method investments	(2,317)	(2,316)
Distributions from equity-method investments	2,550	2,000
Allowance for equity funds used during construction	(7,769)	(7,272)
Other non-cash adjustments to net income, net	3,238	3,490
Change in:
Accounts receivable	(3,451)	5,102
Accounts payable and other accrued liabilities	(42,219)	(49,389)
Taxes accrued/receivable	17,156	12,932
Other current assets	19,403	1,268
Other current liabilities	2,425	5,122
Other assets	(2,234)	(1,925)
Other liabilities	1,902	(279)
Net cash provided by operating activities	83,662	33,796
Investing Activities:
Additions to property, plant and equipment	(77,293)	(73,566)
Payments received from transmission project joint funding partners	1,096	393
Investments in affordable housing	5,335	1,936
Purchases of equity securities	171	3,230
Purchases of short-term investments	(25,000)	0
Maturities of Short-term Investments	25,000	0
Proceeds from the sale of equity securities	1,557	839
Other	797	3,826
Net cash used in investing activities	(79,349)	(73,674)
Financing Activities:
Dividends on common stock	(36,379)	(34,312)
Tax Withholding on net settlements of share-based awards	3,026	4,183
Other	17	10
Net cash (used in) provided by financing activities	(39,422)	(38,505)
Net increase (decrease) in cash and cash equivalents	(35,109)	(78,383)
Cash and cash equivalents at beginning of the period	275,116	217,254
Cash and cash equivalents at end of the period	240,007	138,871
Supplemental Disclosure of Cash Flow Information:
Interest (net of amount capitalized)	25,306	19,887
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	27,910	22,843
Idaho Power Company
Operating Activities:
Net Income	44,369	36,776
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,138	43,505
Deferred income taxes and investment tax credits	(2,958)	(1,207)
Changes in regulatory assets and liabilities	2,833	(9,672)
Pension and postretirement benefit plan expense	7,367	7,260
Contributions to pension and postretirement benefit plans	(918)	(12,270)
Earnings of equity-method investments	(2,550)	(2,453)
Distributions from equity-method investments	2,550	2,000
Allowance for equity funds used during construction	(7,769)	(7,272)
Other non-cash adjustments to net income, net	528	867
Change in:
Accounts receivable	(5,600)	4,161
Accounts payable and other accrued liabilities	(42,193)	(49,344)
Taxes accrued/receivable	17,482	22,446
Other current assets	19,414	1,297
Other current liabilities	2,451	5,207
Other assets	(2,245)	(1,935)
Other liabilities	2,003	(180)
Net cash provided by operating activities	78,902	39,186
Investing Activities:
Additions to property, plant and equipment	(77,293)	(73,566)
Payments received from transmission project joint funding partners	1,096	393
Purchases of equity securities	171	3,230
Proceeds from the sale of equity securities	1,557	839
Other	797	3,796
Net cash used in investing activities	(74,014)	(71,768)
Financing Activities:
Dividends on common stock	(35,941)	(33,952)
Other	(15)	(4)
Net cash (used in) provided by financing activities	(35,956)	(33,948)
Net increase (decrease) in cash and cash equivalents	(31,068)	(66,530)
Cash and cash equivalents at beginning of the period	165,604	98,950
Cash and cash equivalents at end of the period	134,536	32,420
Supplemental Disclosure of Cash Flow Information:
Income taxes	0	(9,189)
Interest (net of amount capitalized)	25,346	19,888
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 27,910	$ 22,843