Duke-American Transmission Co.

We bring together the strengths of two leading electric industry companies to build, own and operate new electric transmission facilities throughout North America.

San Luis Transmission Project

A proposal to build a new transmission line in California to enhance delivery of low-cost power for use to transport federal water in the San Joaquin Valley, Central Coast, and to Bay Area water agencies and farms.

Lines are conceptual and do not indicate actual routes

Project at a Glance

  • Location: Central Valley of California

Duke-American Transmission Co. is supporting Western Area Power Administration in its proposal to build a new high-voltage electric transmission line to connect Western’s transmission system with the Bureau of Reclamation’s San Luis Unit pumping and generating plant near Los Banos, California. The San Luis Unit is a key component in delivering water to central valley water agencies and farmers, and the transmission project is intended to minimize expected power delivery cost increases.

Project facts

  • 85-mile line to connect WAPA’s Tracy Substation to the San Luis, O’Neill and Dos Amigos substations
  • 230,000-volt, high-voltage transmission line with substations at both ends

Economic, reliability and public policy benefits

The San Luis Transmission Project is the least cost and most reliable long-term solution for local water agencies and California electric users. Specifically, the proposed transmission line will enhance delivery of low-cost WAPA power for use to transport federal water in the San Joaquin Valley, central coast and to Bay Area water agencies and farms. The project will:

  • Provide cost certainty: Limits cost increases for water customers and provides long-term cost certainty
  • Enhance reliability: Strengthens the transmission corridor between Tracy and Los Banos areas and enhances delivery of energy and water supplies
  • Enable renewable energy: Strategically positions the San Joaquin Valley for expansion of renewable energy projects; expands transmission access and flexibility to help the state meet its renewable energy and greenhouse gas reduction goals
  • Strengthen the transmission grid: Enhances energy transmission ; improves transmission system reliability in the entire San Joaquin Valley and prevents catastrophic outages
  • Use an existing corridor: Relies on effective use of an existing transmission corridor to minimize costs and farm and environmental impacts

Project need

WAPA is required by law to provide reliable, electric transmission service to Reclamation and its customers. WAPA’s transmission contract with Pacific Gas & Electric for delivery of San Luis Unit power at the federal Central Valley Project expired in 2016, and Reclamation requested that WAPA develop the SLTP to replace the expiring contract.

Support is strong and growing

More than 45 water and leading farm groups support development of the San Luis Transmission Project, which increases reliability, enhances options for adding renewable generation and optimizes use of a constrained corridor.