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Jointly-Owned Facilities (Tables) | 12 Months Ended
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Dec. 31, 2016
Jointly Owned Utility Plant, Net Ownership Amount [Abstract] |
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, 2016 (dollars in thousands):
|  | Percent Owned |  |  |  | Plant in Service |  | Accumulated Depreciation |  | Construction Work in Progress |
Generating facilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Palo Verde Units 1 and 3 |  | 29.1 | % |  |  |  | $ | 1,770,324 |  |  | $ | 1,080,072 |  |  | $ | 17,615 |  |
Palo Verde Unit 2 (a) |  | 16.8 | % |  |  |  | 581,572 |  |  | 360,757 |  |  | 9,717 |  |
Palo Verde Common |  | 28.0 | % |  | (b) |  | 672,799 |  |  | 242,649 |  |  | 62,479 |  |
Palo Verde Sale Leaseback |  |  |  |  | (a) |  | 351,050 |  |  | 237,535 |  |  | — |  |
Four Corners Generating Station |  | 63.0 | % |  |  |  | 934,837 |  |  | 578,924 |  |  | 248,072 |  |
Navajo Generating Station Units 1, 2 and 3 |  | 14.0 | % |  |  |  | 279,629 |  |  | 176,931 |  |  | 5,761 |  |
Cholla common facilities (c) |  | 63.3 | % |  | (b) |  | 159,707 |  |  | 58,276 |  |  | 806 |  | (d)
Transmission facilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ANPP 500kV System |  | 33.6 | % |  | (b) |  | 127,970 |  |  | 38,610 |  |  | 2,291 |  |
Navajo Southern System |  | 22.5 | % |  | (b) |  | 62,135 |  |  | 20,491 |  |  | 334 |  |
Palo Verde — Yuma 500kV System |  | 19.0 | % |  | (b) |  | 13,699 |  |  | 5,368 |  |  | 408 |  |
Four Corners Switchyards |  | 51.3 | % |  | (b) |  | 39,850 |  |  | 10,474 |  |  | 1,044 |  |
Phoenix — Mead System |  | 17.1 | % |  | (b) |  | 39,330 |  |  | 13,725 |  |  | 85 |  |
Palo Verde — Rudd 500kV System |  | 50.0 | % |  | (b) |  | 91,904 |  |  | 19,818 |  |  | 227 |  |
Morgan — Pinnacle Peak System |  | 65.2 | % |  | (b) |  | 140,374 |  |  | 13,557 |  |  | — |  |
Round Valley System |  | 50.0 | % |  | (b) |  | 515 |  |  | 127 |  |  | — |  |
Palo Verde — Morgan System |  | 85.8 | % |  | (b) |  | 125,908 |  |  | 1,326 |  |  | 28,949 |  |
Hassayampa — North Gila System |  | 80.0 | % |  | (b) |  | 142,541 |  |  | 3,231 |  |  | — |  |
Cholla 500kV Switchyard |  | 85.7 | % |  | (b) |  | 5,078 |  |  | 1,201 |  |  | — |  |
Saguaro 500kV Switchyard |  | 75.0 | % |  | (b) |  | 20,456 |  |  | 12,426 |  |  | 2 |  |
(a) | See Note 18.
(b) | Weighted-average of interests.
(c) | PacifiCorp owns Cholla Unit 4 and APS operates the unit for PacifiCorp. The common facilities at Cholla are jointly-owned.
(d) | Due to the closure of Cholla Unit 2 in 2015, all new Cholla common facilities construction is owned by APS at 50.5%

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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