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ED2 to Saguaro No. 2 Transmission Line Rebuild Project (DOE/EA-1972)


Project Description:

Western proposes to replace the ED2 Saguaro No. 2 115-kV Transmission Line's wood H-frame structures (3.1 miles ) and wood single-pole structures (32.5 miles) with steel monopoles (35.6 miles).  The existing structures are 60 to 70 feet tall and the proposed replacements are 60 to 75 feet tall.  The conductors and overhead protection ground wire will be replaced.  Existing access roads will be used to the extent possible and improved as needed.

Western operates and maintains this transmission line under an agreement with the Central Arizona Project (CAP).  It serves three CAP pumping stations:  Brady, Picacho, and Red Rock.  Western is working cooperatively on this project with the U.S. Bureau of Reclamation, U.S. Bureau of Indian Affairs, San Carlos Irrigation Project, and the U.S. Army Corps of Engineers.

The project is located on the east side of Interstate 10 near Eloy, Pinal County, Arizona.  It starts at Western's Electrical District 2 (ED2) Substation located on the east side of Eleven Mile Corner Road, a half mile south of State Route 287, and ends at the Saguaro Substation located next to Arizona Public Service’s Saguaro Steam Plant situated alongside Interstate 10 one mile south of Exit 226 (Red Rock).  The transmission line parallels portions of Eleven Mile Corner, Hanna, Brady Pump Plant, and Pecan Roads and crosses State Route 87 at Hanna Road.

Western's project increases the reliability and safety of the bulk electric system so that the risk of a catastrophic failure on the ED2 Saguaro No. 2 Transmission Line is reduced to the lowest practical level and the greatest long-term benefit is obtained.  This line experienced five major failures in the past 10 years, of which the most recent occurred in 2012 when a wind storm destroyed 30 structures in a three-mile-long section.

Western’s plans to rebuild the transmission line starting in Spring 2016 and complete it by Spring 2018.  The work will occur in stages so that the electrical supply to the pumping plants is uninterrupted.  Once built, Western will operate and maintain the line.

Project Documents:

Biological Evaluation

Preliminary Jurisdictional Waters/Wetlands Delineation Report

Determination to Prepare an Environmental Assessment (see attached)

Scoping Announcement Letter

ED2 SGR Transmission Line Rebuild Field Office Study (10-22-2012)

Electric and Magnetic Field Facts

News and Updates:
Western plans to seek comments from the public on a draft Environmental Assessment in November 2014. Western is currently conducting field studies, performing analyses, and writing the document. Western held a Public Scoping Meeting in Casa Grande, Arizona on March 25, 2014.


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