The Collinsville 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 create additional energy supply from the 500 kV system into the northern Greater Bay Area that will advance the development of renewable generation and increase reliability including reducing overloads on the 230 kV system. The Project is located in Contra Costa, Sacramento and Solano Counties, California with a planned in-service date of 2028.
The Project includes a new 500/230 kV Collinsville substation, approximately one to two miles of overhead 230 kV transmission line, and approximately four miles of 230 kV submarine cable. Submerged transmission structures near each bank of the Sacramento River will transition the 230 kV line from overhead to submarine cables. The 230 kV line will terminate at PG&E’s Pittsburg substation just south of the Sacramento River in Contra Costa County. The new Collinsville substation is planned to be located approximately one to two miles north of the Sacramento River in Solano County where it will loop in PG&E’s Vaca Dixon to Tesla 500 kV line.
Construction of the Project is planned to begin in early 2026 after the necessary permits and approvals are obtained. The construction phase of the Project is anticipated to be approximately 24 to 30 months in duration, concluding with the energization of the new Project facilities.