APS 2015 Annual Report Download - page 43

Table of Contents
(a) 100% unless otherwise noted.
(b) See “Business of Arizona Public Service Company — Energy Sources and Resource Planning — Generation Facilities —
Nuclear” in Item 1 for details regarding leased interests in Palo Verde. The other participants are Salt River Project (17.49%),
SCE (15.8%), El Paso (15.8%), Public Service Company of New Mexico (10.2%), Southern California Public Power Authority
(5.91%), and Los Angeles Department of Water & Power (5.7%). The plant is operated by APS.
(c) The other participants are Salt River Project (10%), Public Service Company of New Mexico (13%), Tucson Electric Power
Company (7%) and El Paso (7%). The plant is operated by APS.
(d) Cholla Unit 2's last day of service was on October 1, 2015.
(e) The other participants are Salt River Project (21.7%), Nevada Power Company (11.3%), the United States Government (24.3%),
Tucson Electric Power Company (7.5%) and Los Angeles Department of Water & Power (21.2%). The plant is operated by Salt
River Project.
See “Business of Arizona Public Service Company — Environmental Matters” in Item 1 with respect to matters having a
possible impact on the operation of certain of APS’s generating facilities.
See “Business of Arizona Public Service Company” in Item 1 for a map detailing the location of APS’s major power plants and
principal transmission lines.
Transmission and Distribution Facilities
Current Facilities. APS’s transmission facilities consist of approximately 6,070 pole miles of overhead lines and approximately
49 miles of underground lines, 5,847 miles of which are located in Arizona. APS’s distribution facilities consist of approximately
11,077 miles of overhead lines and approximately 18,071 miles of underground primary cable, all of which are located in Arizona. APS
distribution facilities reflect an actual net gain of 169 miles in 2015. APS shares ownership of some of its transmission facilities with
other companies. The following table shows APS’s jointly-owned interests in those transmission facilities recorded on the Consolidated
Balance Sheets at December 31, 2015:
Percent Owned
(Weighted-Average)
Morgan — Pinnacle Peak System 64.6%
Palo Verde — Estrella 500kV System 50.0%
Round Valley System 50.0%
ANPP 500kV System 33.4%
Navajo Southern System 22.7%
Four Corners Switchyards 49.8%
Palo Verde — Yuma 500kV System 19.3%
Phoenix — Mead System 17.1%
Palo Verde — Morgan System 87.7%
Hassayampa — North Gila System 80.0%
Cholla 500 Switchyard 85.7%
Saguaro 500 Switchyard 75.0%
Expansion. Each year APS prepares and files with the ACC a ten-year transmission plan. In APS’s 2015 plan, APS projects it
will develop 275 miles of new lines over the next ten years. One significant project currently under development is a new 500kV path
that will span from the Palo Verde hub around the western and northern edges of the Phoenix metropolitan area and terminate at a bulk
substation in the northeast part of Phoenix. The Palo Verde to Morgan System includes Palo Verde-Delaney-Sun Valley-Morgan. The
project consists of four phases. The first phase, Morgan to Pinnacle Peak 500kV, is currently in-service. The second
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