South Mountain Transmission Project
SRP proposes new power infrastructure project to support planned and future growth and development in Laveen.
About the project
To support future growth and development in the Laveen area of Phoenix, SRP is proposing to build the South Mountain Transmission (SMT) Project. As part of this project, we have begun identifying options for transmission line routes to meet the needs of our customers and the community.
The SMT Project will require a new 500/230/69-kilovolt (kV) substation in Laveen, two new overhead double-circuit 230 kV transmission lines that will range in length from 2-3 miles depending on the selected route, and less than 1 mile of two new overhead 500 kV transmission lines.
Why is this project needed?
The City of Phoenix is planning for future development in Laveen along the South Mountain Freeway, which may include a mix of land uses and development options, such as an industrial and tech park, hotel and resort, retail, hospitals, residential developments and new businesses to accommodate and attract high-wage jobs.
Additional electric transmission will be required to power this planned development, which is in SRP’s service territory.
Project approval process and timeline
CEC requirements
SRP is preparing an application seeking a Certificate of Environmental Compatibility (CEC) to be filed with the Arizona Corporation Commission (ACC). The CEC process includes public hearings with the Arizona Power Plant and Transmission Line Siting Committee before seeking final approval from the ACC.
Open houses
SRP invites the public to attend the upcoming virtual or in-person open houses to learn more about the SMT Project and provide input on the transmission line routes under consideration.
Tuesday, Sept. 10, 2024
4:30-6:30 p.m., Cesar Chavez Community Center - 7858 S 35th Ave, Laveen, AZ 85339
Register now
Registration is required for the virtual open houses and recommended for the in-person open house.
Project maps
New route option added to map
As we continue working with the landowners, stakeholders and members of the public, we are working on analyzing all possible route alternatives. Additional routes are being considered and would like to ensure we obtain feedback on all routing options in our upcoming open houses.
Proposed route map for September 2024 Open Houses (new routes proposed)
The map below identifies new proposed route alternatives for the 230 kV lines as well as other project components after incorporating public input during open houses and other stakeholder meetings.
Original proposed route map from May and June 2024 Open Houses
The map below identifies the route alternatives for the 230 kV lines, the location of the 500 kV transmission and new planned substation.
Transmission line structure types
Below are typical SRP transmission structure types. The structure types that will be used on this project are the 500kV 140’-160’ and 230/69kV 120’-160’ type structures.
Past events
| Date & Time | Event | Location |
| Thursday, May 30, 2024 Noon & 5:30 p.m. |
Live online public open house meetings. View the presentation  . |
Online |
| Thursday, June 6, 2024 4:30-6:30 p.m. |
In-person open house | Betty H. Fairfax High School 8225 S. 59th Ave., Laveen, AZ 85339 |
News archive
The latest project news and announcements will be added here when available.
Contact us
If you have questions about the project, please call 1-855-584-1484 or email 2872line@srpnet.com.
South Mountain Transmission Project Feedback Form
Thank you for contacting SRP about the South Mountain Project. You may also call 1-855-584-1484.
There was a problem sending your request. Please try again later. If you would like assistance, please call 1-855-584-1484.
