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SRP South Mountain Transmission Project

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 sets of approximately 4 to 5 miles of new overhead double-circuit 230 kV transmission lines, and a half-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. 

Project map

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 presentationDocument is a PDF.
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

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