City project
Second transmission corridor
Proposed additional electric transmission connection intended to increase supply diversity and capacity for Palo Alto.
- Current status
- Load forecasts have been submitted to CAISO and staff is iterating with CAISO; staff is prioritizing the 2025 transmission-planning process.
- Location
- NASA in Mountain View to Palo Alto
August 5, 2026 update
Contractor had installed substantial conduit and was installing cable in preparation to energize the line; heat and fire conditions limited some field work.
Read related coverageJune 3, 2026 construction update
Staff reported that remaining conduit work was expected to finish by the end of June 2026. Secondary customer services would then be undergrounded, with the existing line expected to be deenergized in November 2026.
Read related coverageCalifornia ISO approval and implementation update
California ISO authorization allows the project to proceed. The estimated in-service date is 2034; staff will discuss potential acceleration with PG&E and plans related grid-modernization improvements at the Colorado receiving station.
Read related coverageMay 7, 2025 update
Staff reported that CAISO is considering a new 112-kilovolt transmission line. PG&E would build the line, while costs would be allocated through CAISO transmission access charges across its service territory.
Read related coverageApril 2, 2025 work-plan update
The commission incorporated the topic into the electric-system-and-supply standing language rather than retaining a separate Stanford interconnection item.
Read related coverageCAISO transmission-planning process update
Staff described pursuing a southern interconnection through CAISO, with local-system modeling and coordination with PG&E needed for a workable submission. A separate possible connection through SLAC and Stanford remains under discussion but is not the current priority.
Read related coverage
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