XML 57 R29.htm IDEA: XBRL DOCUMENT
v3.24.0.1

PROPERTY, PLANT AND EQUIPMENT AND JOINTLY-OWNED PROJECTS: | 12 Months Ended
--- | ---
Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | PROPERTY, PLANT AND EQUIPMENT AND JOINTLY-OWNED PROJECTS 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, 2023 and 2022 (in thousands of dollars):
|  | 2023 |  | 2022
|  | Balance |  | Avg Rate |  | Balance |  | Avg Rate
Production |  | $ | 2,794,534 |  |  | 3.50 | % |  | $ | 2,700,494 |  |  | 2.89 | %
Transmission |  | 1,392,338 |  |  | 1.90 | % |  | 1,346,463 |  |  | 1.91 | %
Distribution |  | 2,454,458 |  |  | 2.18 | % |  | 2,192,135 |  |  | 2.15 | %
General and Other |  | 650,202 |  |  | 5.21 | % |  | 589,375 |  |  | 5.36 | %
Total in service |  | 7,291,532 |  |  | 2.89 | % |  | 6,828,467 |  |  | 2.66 | %
Accumulated provision for depreciation |  | (2,557,744) |  |  |  |  | (2,465,279) |  |  |
In service - net |  | $ | 4,733,788 |  |  |  |  | $ | 4,363,188 |  |  |
At December 31, 2023, Idaho Power's construction work in progress balance of $985.5 million included relicensing costs of $459.8 million for the HCC, Idaho Power's largest hydropower complex. In 2023, 2022, and 2021, Idaho Power had IPUC authorization to include in its Idaho jurisdiction rates $6.5 million annually ($8.8 million when grossed-up for the effect of income taxes) of AFUDC relating to the HCC relicensing project. Collecting these amounts will reduce the amount collected in the future once the HCC relicensing costs are approved for recovery in base rates. At December 31, 2023, Idaho Power's regulatory liability for collection of AFUDC relating to the HCC was $228.7 million. 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, 2023 (in thousands of dollars):
Name of Plant |  | Location |  | Utility Plant in Service |  | Construction Work in Progress |  | Accumulated Provision for Depreciation |  | Ownership % |  | MW(1)(2)
Jim Bridger units 1-4 |  | Rock Springs, WY |  | $ | 770,179 |  |  | $ | 12,891 |  |  | $ | 500,685 |  |  | 33 |  | 775
North Valmy unit 2(2) |  | Winnemucca, NV |  | 262,544 |  |  | 2,237 |  |  | 225,147 |  |  | 50 |  | 145
(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. IERCo, Idaho Power’s wholly-owned subsidiary, is a joint-owner of BCC. Idaho Power’s coal purchases from BCC were $67.9 million in 2023, $60.4 million in 2022, and $59.7 million in 2021.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration