Idaho Power Company Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 218,550	$ 215,243
Receivables [Abstract]
Customer	82,122	78,819
Other	17,752	14,994
Income taxes receivable	4,754	14,770
Accrued unbilled revenues	59,625	74,843
Materials and supplies (at average cost)	80,203	77,552
Fuel stock (at average cost)	20,156	18,045
Prepayments	20,955	24,676
Current regulatory assets	91,196	71,223
Other	16,585	5,708
Total current assets	611,898	595,873
Investments	117,797	123,824
Property, Plant and Equipment [Abstract]
Utility plant in service	6,566,656	6,509,316
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(2,327,248)	(2,298,951)
Utility plant in service - net	4,239,408	4,210,365
Construction work in progress	725,904	670,585
Utility plant held for future use	4,410	4,511
Other property, net of accumulated depreciation	16,381	16,361
Property, plant and equipment - net	4,986,103	4,901,822
Other Assets:
Company-owned life insurance	68,503	67,343
Regulatory assets	1,438,850	1,462,431
Other	61,406	59,222
Total other assets	1,568,759	1,588,996
Total assets	7,284,557	7,210,515
Current Liabilities:
Accounts payable	121,037	145,980
Taxes accrued	20,590	14,229
Interest accrued	19,328	23,959
Accrued compensation	42,154	55,666
Current regulatory liabilities	29,699	11,239
Advances from customers	65,013	43,472
Other	29,757	31,079
Total current liabilities	327,578	325,624
Other Liabilities [Abstract]
Deferred Income Tax	837,394	842,375
Regulatory liabilities	791,166	781,695
Pension and other postretirement benefits	527,147	521,462
Other	66,408	63,485
Total other liabilities	2,222,115	2,209,017
Long-Term Debt	2,050,634	2,000,640
Commitments and Contingencies
Equity [Abstract]
Common stock	875,067	874,896
Retained earnings	1,841,644	1,833,580
Accumulated other comprehensive loss	(39,203)	(40,040)
Total equity	2,684,230	2,675,234
Total	7,284,557	7,210,515
Idaho Power Company [Member]
Current Assets:
Cash and cash equivalents	67,219	60,075
Receivables [Abstract]
Customer	82,122	78,819
Other	17,577	14,134
Income taxes receivable	5,504	15,328
Accrued unbilled revenues	59,625	74,843
Materials and supplies (at average cost)	80,203	77,552
Fuel stock (at average cost)	20,156	18,045
Prepayments	20,814	24,558
Current regulatory assets	91,196	71,223
Other	16,585	5,708
Total current assets	461,001	440,285
Investments	72,130	77,108
Property, Plant and Equipment [Abstract]
Utility plant in service	6,566,656	6,509,316
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(2,327,248)	(2,298,951)
Utility plant in service - net	4,239,408	4,210,365
Construction work in progress	725,904	670,585
Utility plant held for future use	4,410	4,511
Other property, net of accumulated depreciation	3,647	3,647
Property, plant and equipment - net	4,973,369	4,889,108
Other Assets:
Company-owned life insurance	68,503	67,343
Regulatory assets	1,438,850	1,462,431
Other	56,784	54,564
Total other assets	1,564,137	1,584,338
Total assets	7,070,637	6,990,839
Current Liabilities:
Accounts payable	120,935	145,871
Accounts payable to affiliates	2,951	2,159
Taxes accrued	22,814	14,316
Interest accrued	19,328	23,959
Accrued compensation	41,908	55,491
Current regulatory liabilities	29,699	11,239
Advances from customers	65,013	43,472
Other	20,328	19,117
Total current liabilities	322,976	315,624
Other Liabilities [Abstract]
Deferred Income Tax	839,995	844,871
Regulatory liabilities	791,166	781,695
Pension and other postretirement benefits	527,147	521,462
Other	65,564	62,245
Total other liabilities	2,223,872	2,210,273
Long-Term Debt	2,050,634	2,000,640
Commitments and Contingencies
Equity [Abstract]
Common stock	97,877	97,877
Premium on capital stock	712,258	712,258
Capital stock issuance costs	(2,097)	(2,097)
Retained earnings	1,704,320	1,696,304
Accumulated other comprehensive loss	(39,203)	(40,040)
Total equity	2,473,155	2,464,302
Total	$ 7,070,637	$ 6,990,839