Extra-high voltage power line projects

SRP's Public Involvement department actively pursues constructive interaction with communities to site critical infrastructure.

Public Involvement incorporates technical and educational elements in its outreach efforts to the people, organizations and jurisdictional leaders in each community. The department then works to ensure that SRP project management receives constructive feedback from the communities.

Once a project is sited, Public Involvement remains in contact with the community through construction providing a continuous thread of communication from project start to finish.

These include active 500-kV, 230-kV and 115-kV power line siting and construction projects.


There are no 500-kV projects currently in the siting process or under construction.


230-kV projects currently in the siting process:

  • Price Road Corridor
    A public process is underway to site new 230-kilovolt (kV) power lines and a new 230-kV substation. These new facilities will provide greater reliability and enhance the overall electric system for customers in south Tempe and Chandler. You can learn more on our online open house website.

230-kV projects currently in design or construction:

  • Abel - Moody
    SRP will build a double-circuit 230-kV transmission line connecting the Abel substation to a previously sited 230/69-kV substation site to serve developing areas in and around Queen Creek. The new transmission line will also connect to a new 230/69-kV substation that was sited as part of this project.


115-kV projects currently in design or construction:

  • Superior - Silver King Relocation
    At the request of Resolution Copper Mining, LLC, SRP will relocate approximately one mile of an existing 115-kV line on Resolution's property.

Permitted corridors

The following projects have been granted Certificates of Environmental Compatibility (CEC) by the Line Siting Committee. Construction schedules for transmission lines is to be determined

500-kV projects that are permitted, but not yet built:

  • Palo Verde - Pinal West Document is a PDF
    This CEC was approved on May 18, 2004. The CEC allows for SRP to construct two parallel single circuit 500-kV lines from the Hassayampa Switchyard to the Pinal West substation. One of the lines was built and energized in 2007. The second permitted line has an expiration date of 2024. Case 124, Decision 67012.
  • Palo Verde - Saguaro Document is a PDF
    In January 1976, joint applicants APS, SRP, El Paso Electric Company, Public Service of New Mexico and Arizona Electric Power Cooperative were granted a CEC for the construction of a 500-kV transmission line from the the Palo Verde Generating Station to the Saguaro RS; Case 24, Decision 46802.
  • Saguaro - WinchesterDocument is a PDF
    In January 1976, the Power Plant and Line Siting Committee awarded a CEC to the SRP, APS, SRP, El Paso Electric Company, Public Service of New Mexico and Arizona Electric Power Cooperative for construction of a 500-kV line from the Saguaro Generating Station to the Winchester Substation; Case 23, Decision 46801.

230-kV projects that are permitted, but not yet built:

  • Pinnacle Peak - Brandow Document is a PDF
    SRP was awarded a CEC in January 1985 to co-locate this circuit on the existing Pinnacle Peak - Brandow/Papago Buttes 230-kV line; Case 69, Decision 54345.

Contact us

Please call SRP at (602) 236-2872 or send us an email for more information or to share your comments.