MOSS LANDING — PG&E’s battery energy storage system saw an operational failure during testing, prompting a delay in its return to service until June 30, 2026.

PG&E’s Elkhorn battery storage system, comprising 256 Tesla megapack batteries, automatically disconnected from the electrical grid when the nearby Vistra battery storage system ignited in January. The Elkhorn system remained inactive until June, when Tesla, which maintains the system, began a series of operational and safety checks in hopes of resuming operations that month . During its tests, a clamp failure in one of the megapacks caused a coolant leak. The issue did not result in any injuries, power outages or fires, PG&E said in a statement.

Tesla is now making plans for inspections and repairs, pushing the system’s estimate

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