Safety incident reported at 80 MWh grid-scale battery storage facility in California

A safety incident occurred at a 20 MW / 80 MWh lithium iron phosphate battery energy storage facility located at a substation site, roughly two years after the system entered commercial operation. The facility, one of two co-located storage systems at the same substation, was identified by a state utility regulator as having experienced a reportable safety event. Publicly available records confirm that an incident took place on the stated date and that it was subsequently listed among a series of energy storage safety incidents that prompted regulatory review of maintenance, operation and emergency reporting standards for battery storage systems. The available sources do not describe the specific nature of the event, such as whether it involved fire, thermal runaway, electrical fault or another failure mode, nor do they report on injuries, evacuation, fire service response or downtime.

Not reported in available sources.

1. Regulators are moving to require battery storage operators to formally report safety incidents, including fires, thermal events and other system failures, to state authorities.
2. Operators should ensure emergency response and emergency action plans are developed and coordinated with local fire and emergency services regardless of whether an incident has yet occurred at a site.
3. Detailed public incident narratives are often unavailable at first reporting; operators and regulators publishing only summary or tabular incident data limits the transferability of lessons across the industry, highlighting the value of more detailed post-incident disclosure.

docs.cpuc.ca.gov/PublishedDocs/Published/G000/M555/K812/555812634.pdf