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. in partnership with the Western Area Power Administration is proposing to build a new high-voltage electric transmission line to provide the electricity necessary for the economical and reliable delivery of federal water supplies to Central Valley and Bay Area residents, businesses and farms.

Project facts

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

Project benefits

  • 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.

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.

Visit the project website, www.sanluistransmission.com, for more information.