Irvington-East Loop Transmission Line

TEP is developing a new transmission line to help serve growing energy needs. The project will help Davis-Monthan Air Force Base satisfy its energy resiliency requirements and improve electric reliability for customers.

In cooperation with community members and project stakeholders, TEP identified a route for the Irvington-East Loop 138 Kilovolt (kV) Transmission Line, which will connect the Irvington and East Loop substations, and interconnect with the planned Port and Patriot substations.

In February 2020, the Arizona Power Plant and Transmission Line Siting Committee voted unanimously to grant TEP’s application for a Certificate of Environmental Compatibility (CEC). The Arizona Corporation Commission reviewed and approved the CEC in April 2020.

Construction of the new 13-mile line started in 2021 and is expected to continue through summer 2024. Details about construction in the area is also available on our Working in Your Neighborhood page.

For project related inquiries, please send an email to or call (520) 382-4662.

Project Details

Public Outreach Materials

Answers to Questions about Underground Electric Lines

Most of TEP's electrical facilities are installed above ground, but some lower-voltage distribution lines are installed underground. To learn more, please review answers to frequently asked questions about the potential underground installation of transmission lines and distribution lines.