APS 2012 Annual Report Download - page 65

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(15.8%), El Paso Electric Company (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%), SCE (48%), Tucson Electric Power Company (7%) and El Paso
Electric Company (7%). The plant is operated by APS. As discussed under “Business
of Arizona Public Service Company – Energy Sources and Resource Planning –
Generation Facilities – Coal-Fueled Generating Facilities – Four Corners” in Item 1,
APS and SCE have entered into an agreement by which APS would acquire SCE’s
interest in Units 4 and 5, after which APS would close Units 1, 2 and 3.
(d) 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 5,883 pole miles of
overhead lines and approximately 49 miles of underground lines, 5,660 miles of which are located in
Arizona. APS’s distribution facilities consist of approximately 11,381 miles of overhead lines and
approximately 17,572 miles of underground primary cable, all of which are located in Arizona. 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, 2012:
Percent Owned
(Weighted-Average)
Morgan – Pinnacle Peak System
64.1%
Palo Verde – Estrella 500kV System
50.0%
Round Valley System
50.0%
ANPP 500kV System
33.3%
Navajo Southern System
22.2%
Four Corners Switchyards
37.0%
Palo Verde – Yuma 500kV System
18.3%
Phoenix – Mead System
17.1%
Expansion. Each year APS prepares and files with the ACC a ten-year transmission plan. In
APS’s 2013 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 project consists of four phases. The first phase,