Idaho Power Company Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 169,559	$ 327,429
Receivables [Abstract]
Customer	132,426	107,256
Other	32,063	44,661
Income taxes receivable	0	24,574
Accrued unbilled revenues	120,783	90,521
Materials and supplies (at average cost)	165,180	140,515
Fuel stock (at average cost)	34,842	19,952
Prepayments	24,397	22,840
Current regulatory assets	135,058	226,235
Other	131	71
Total current assets	814,439	1,004,054
Investments	165,946	163,971
Property, Plant and Equipment [Abstract]
Utility plant in service	7,476,066	7,291,532
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(2,644,334)	(2,557,744)
Utility plant in service - net	4,831,732	4,733,788
Construction work in progress	1,261,405	985,502
Utility plant held for future use	9,883	9,511
Other property, net of accumulated depreciation	13,599	16,429
Property, plant and equipment - net	6,116,619	5,745,230
Other Assets:
Company-owned life insurance	86,518	82,038
Regulatory assets	1,429,624	1,426,815
Other	63,987	53,810
Total other assets	1,580,129	1,562,663
Total assets	8,677,133	8,475,918
Current Liabilities:
Current maturities of long-term debt	49,800	49,800
Accounts payable	205,587	308,504
Taxes accrued	19,319	6,854
Interest accrued	37,056	38,292
Accrued compensation	49,775	64,645
Current regulatory liabilities	8,293	7,952
Advances from customers	100,907	104,297
Other	54,895	53,732
Total current liabilities	525,632	634,076
Other Liabilities [Abstract]
Deferred Income Tax	866,822	882,724
Regulatory liabilities	882,318	874,601
Pension and other postretirement benefits	243,430	233,965
Other	178,895	160,019
Total other liabilities	2,171,465	2,151,309
Long-Term Debt	2,776,129	2,775,790
Commitments and Contingencies
Equity [Abstract]
Common stock	1,123,745	888,615
Retained earnings	2,089,185	2,036,138
Accumulated other comprehensive loss	(16,616)	(17,184)
Total equity	3,203,907	2,914,743
Total	8,677,133	8,475,918
Idaho Power Company
Current Assets:
Cash and cash equivalents	88,111	271,791
Receivables [Abstract]
Customer	132,426	107,256
Other	31,366	44,335
Income taxes receivable	0	22,926
Accrued unbilled revenues	120,783	90,521
Materials and supplies (at average cost)	165,180	140,515
Fuel stock (at average cost)	34,842	19,952
Prepayments	24,260	22,710
Current regulatory assets	135,058	226,235
Other	131	71
Total current assets	732,157	946,312
Investments	93,307	93,037
Property, Plant and Equipment [Abstract]
Utility plant in service	7,476,066	7,291,532
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(2,644,334)	(2,557,744)
Utility plant in service - net	4,831,732	4,733,788
Construction work in progress	1,261,405	985,502
Utility plant held for future use	9,883	9,511
Other property, net of accumulated depreciation	1,721	4,310
Property, plant and equipment - net	6,104,741	5,733,111
Other Assets:
Company-owned life insurance	86,518	82,038
Regulatory assets	1,429,624	1,426,815
Other	52,595	42,218
Total other assets	1,568,737	1,551,071
Total assets	8,498,942	8,323,531
Current Liabilities:
Current maturities of long-term debt	49,800	49,800
Accounts payable	204,816	307,538
Taxes accrued	40,922	6,834
Interest accrued	37,056	38,292
Accrued compensation	49,602	64,408
Current regulatory liabilities	8,293	7,952
Advances from customers	100,907	104,297
Other	37,644	44,907
Total current liabilities	538,536	640,484
Other Liabilities [Abstract]
Deferred Income Tax	864,804	881,050
Regulatory liabilities	882,318	874,601
Pension and other postretirement benefits	243,430	233,965
Other	160,939	135,468
Total other liabilities	2,151,491	2,125,084
Long-Term Debt	2,776,129	2,775,790
Commitments and Contingencies
Equity [Abstract]
Common stock	97,877	97,877
Premium on capital stock	912,258	712,258
Capital stock issuance costs	(2,097)	(2,097)
Retained earnings	2,041,364	1,991,319
Accumulated other comprehensive loss	(16,616)	(17,184)
Total equity	3,032,786	2,782,173
Total	8,498,942	8,323,531
Idaho Power Company | Related Party
Current Liabilities:
Accounts Payable, Other	$ 9,496	$ 16,456