SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Summary of Significant Accounting Policies Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Significant Accounting Policies
Payments for (Proceeds from) Other Investing Activities	$ (2,153)	$ (4,875)	$ (2,037)
Other assets, noncurrent	53,810	59,427
Investments	163,971	121,352
Utility plant in service - net	$ 4,733,788	4,363,188
Maturity period of short-term investments	90 days
Late Payment Fee Customer Billings	1.00%
Impairment of Receivables	$ 0	$ 0
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.90%	2.70%	2.90%
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0	$ 0
Public Utilities, Allowance for Funds Used During Construction, Rate	7.40%	7.40%	7.50%
Other Nonoperating Income (Expense)	$ 36,522	$ 10,805	$ (3,141)
Other electric utility operating expenses	38,550	37,325	34,673
Other property, net of accumulated depreciation	$ 16,429	16,946
Period of Time After Which Unpaid Accounts Are Deemed Late	30 days
Marysville Hydro Partners
Significant Accounting Policies
Variable Interest Entity Ownership Percentage of Partner	50.00%
Utility plant in service - net	$ 14,900
Ida-West Energy
Significant Accounting Policies
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Bridger Coal Company
Significant Accounting Policies
Investments	$ 24,100
IERCo guarantee of BCC reclamation obligation	142,900
Idaho Power Company
Significant Accounting Policies
Payments for (Proceeds from) Other Investing Activities	(6,198)	(7,605)	(2,231)
Other assets, noncurrent	42,218	52,038
Investments	93,037	78,791
Utility plant in service - net	4,733,788	$ 4,363,188
IERCo guarantee of BCC reclamation obligation	$ 47,600
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.89%	2.66%
Other Nonoperating Income (Expense)	$ 34,713	$ 9,147	(3,171)
Other electric utility operating expenses	38,550	37,325	$ 34,673
Other property, net of accumulated depreciation	$ 4,310	$ 4,558
IDACORP Financial Services Limited Partnership Interests
Significant Accounting Policies
Variable interest entities ownership percentage minimum	4.00%
Variable interest entities ownership percentage maximum	100.00%
IDACORP Financial Services Limited Partnership Interests | Variable Interest Entity, Primary Beneficiary [Member]
Significant Accounting Policies
Net Assets	$ 57,300