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PROPERTY, PLANT AND EQUIPMENT AND JOINTLY-OWNED PROJECTS: Property, Plant and Equipment Level 3 (Tables)
 12 Months Ended
Dec. 31, 2020
Public Utility, Property, Plant and Equipment  
Schedule of Public Utility Property, Plant, and Equipment
The following table presents the major classifications of Idaho Power’s utility plant in service, annual depreciation provisions as a percent of average depreciable balance, and accumulated provision for depreciation for the years ended December 31, 2020 and 2019 (in thousands of dollars):
 20202019
 BalanceAvg RateBalanceAvg Rate
Production$2,529,708 3.23 %$2,535,938 3.19 %
Transmission1,272,360 1.88 %1,220,703 1.89 %
Distribution1,968,752 2.26 %1,882,136 2.25 %
General and Other512,970 6.17 %474,790 6.17 %
Total in service6,283,790 2.88 %6,113,567 2.87 %
Accumulated provision for depreciation(2,193,831) (2,155,783) 
In service - net$4,089,959  $3,957,784  
Schedule of Jointly Owned Utility Plants
Idaho Power's ownership interest in two jointly-owned generating facilities is included in the table above. Under the joint operating agreements for these facilities, each participating utility is responsible for financing its share of construction, operating, and leasing costs. Idaho Power's proportionate share of operating expenses for each facility is included in the Consolidated Statements of Income. These jointly-owned facilities, including balance sheet amounts and the extent of Idaho Power’s participation, were as follows at December 31, 2020 (in thousands of dollars): 
Name of PlantLocationUtility Plant in ServiceConstruction
Work in Progress		Accumulated
Provision for Depreciation		Ownership %
MW(1)(2)
Jim Bridger units 1-4Rock Springs, WY$749,735 $8,062 $376,232 33771
North Valmy unit 2(2)
Winnemucca, NV253,409 347 180,669 50145
(1) Idaho Power’s share of nameplate capacity.
(2) Pursuant to an agreement with NV Energy, Idaho Power's participation in coal-fired operations of North Valmy ended in December 2019 at unit 1 and is planned to end no later than the end of 2025 at unit 2.