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Jointly-Owned Facilities (Tables) | 12 Months Ended
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Dec. 31, 2024
Jointly Owned Utility Plant, Net Ownership Amount [Abstract] |
Schedule Of APS's Interests In Jointly-owned Facilities Recorded On The Consolidated Balance Sheets | 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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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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