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Jointly-Owned Facilities | 12 Months Ended
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Dec. 31, 2024
Jointly Owned Utility Plant, Net Ownership Amount [Abstract] |
Jointly-Owned Facilities | Jointly-Owned Facilities APS shares ownership of some of its generating and transmission facilities with other companies. We are responsible for our share of operating costs which are included in the corresponding operating expenses on our Consolidated Statements of Income. We are also responsible for providing our own financing. Our share of operating expenses and utility plant costs related to these facilities is accounted for using proportional consolidation. The following table shows APS’s interests in those jointly-owned facilities recorded on the Consolidated Balance Sheets at December 31, 2024 (dollars in thousands):
|  | Percent Owned |  |  |  | Plant in Service |  | Accumulated Depreciation |  | Construction Work in Progress
Generating facilities: |  |  |  |  |  |  |  |  |  |
Palo Verde Units 1 and 3 |  | 29.1 | % |  |  |  | $ | 2,010,346 |  |  | $ | 1,081,321 |  |  | $ | 20,694 |
Palo Verde Unit 2 (a) |  | 16.8 | % |  |  |  | 709,414 |  |  | 397,235 |  |  | 9,076 |
Palo Verde Common |  | 28.0 | % |  | (b) |  | 898,401 |  |  | 366,027 |  |  | 47,962 |
Palo Verde Sale Leaseback |  |  |  | (a) |  | 351,050 |  |  | 268,494 |  |  | — |
Four Corners Generating Station |  | 63.0 | % |  |  |  | 1,848,412 |  |  | 705,667 |  |  | 56,226 |
Cholla Common Facilities (c) |  | 50.5 | % |  |  |  | 301,035 |  |  | 231,170 |  |  | 1,743 |
Transmission facilities: |  |  |  |  |  |  |  |  |  |
Arizona Nuclear Power Project 500kV System |  | 33.3 | % |  | (b) |  | 134,713 |  |  | 60,174 |  |  | 7,174 |
Navajo Southern System |  | 24.7 | % |  | (b) |  | 88,528 |  |  | 38,797 |  |  | 626 |
Palo Verde — Yuma 500kV System |  | 25.5 | % |  | (b) |  | 24,260 |  |  | 8,120 |  |  | 142 |
Four Corners Switchyards |  | 58.0 | % |  | (b) |  | 84,367 |  |  | 23,886 |  |  | 309 |
Phoenix — Mead System |  | 17.1 | % |  | (b) |  | 39,788 |  |  | 21,173 |  |  | 330 |
Palo Verde — Rudd 500kV System |  | 50.0 | % |  |  |  | 95,785 |  |  | 34,254 |  |  | 1,808 |
Morgan — Pinnacle Peak System |  | 63.2 | % |  | (b) |  | 117,500 |  |  | 29,013 |  |  | 287 |
Round Valley System |  | 50.0 | % |  |  |  | 548 |  |  | 213 |  |  | — |
Palo Verde — Morgan System |  | 87.5 | % |  | (b) |  | 266,547 |  |  | 46,327 |  |  | 208 |
Hassayampa — North Gila System |  | 80.0 | % |  |  |  | 154,330 |  |  | 27,739 |  |  | — |
Cholla 500kV Switchyard |  | 85.7 | % |  |  |  | 8,454 |  |  | 2,859 |  |  | 35 |
Saguaro 500kV Switchyard |  | 60.0 | % |  |  |  | 29,850 |  |  | 15,768 |  |  | 101 |
Kyrene — Knox System |  | 50.0 | % |  |  |  | 578 |  |  | 349 |  |  | — |
Agua Fria Switchyard |  | 10.0 | % |  |  |  | — |  |  | — |  |  | 82 |
(a)See Note 17. (b)Weighted-average of interests. (c)PacifiCorp owns Cholla Unit 4 (see Note 3 for additional information), and APS operated the unit for PacifiCorp. Cholla Unit 4 was retired on December 24, 2020. The common facilities at Cholla are jointly-owned.

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