Manning 500/230 kV Substation Project

Manning 500/230 kV Substation Project

The Manning 500/230 kV Substation Project was awarded to LS Power Grid California, LLC in 2023 through a competitive solicitation conducted by CAISO for its 2021-22 Transmission Planning Process.  This policy-driven project will enable the advancement of renewable generation within the Westlands/San Joaquin area and address overloads on PG&E’s 230 kV system. The Project is located in Fresno County, California with a planned in-service date of 2028.

The Project includes a new 500/230 kV Manning substation and approximately ten miles of new 230 kV overhead transmission lines from the new Manning substation to PG&E’s Tranquility substation. Additionally, PG&E’s Los Banos to Midway #2 500 kV line, Los Banos to Gates #1 500 kV line, and Panoche to Tranquility #1 and #2 230kV lines will be looped into the Manning substation.

For information regarding the Certificate of Public Convenience and Necessity (CPCN) Application please visit:

For more information please visit:

Manning 500/230kV Substation Project Open House

October 26, 2023