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A thermal incident occurred at the California Flats Energy Storage Project, a battery energy storage system co-located with a large solar plant near Parkfield in Monterey County, California, operated and owned by Arevon Energy, with the battery system supplied and integrated by Tesla. The site's thermal detection system triggered and automatically alerted emergency services. Four of 84 battery units at the facility were affected; the remainder of the system was unaffected. Local fire authorities attended but were not required to take suppression action, and the fire was allowed to burn out under controlled monitoring. As a precaution, an evacuation order was issued for a small number of nearby residences within a two-mile radius, which was lifted after approximately three hours once responders confirmed there was no ongoing threat to the public. No injuries or fatalities were reported, and no private property was damaged.

Tesla Megapack lithium-ion battery storage

Not publicly disclosed; described only as a 'thermal incident' confined to four of 84 battery units

Four of 84 battery units (Tesla Megapacks) at the facility

CAL FIRE responded initially to a reported possible vegetation fire and discovered a battery fire; local fire departments dispatched to monitor the site but were not required to take suppression action; Tesla Field Services Response Team also attended and monitored the site 24/7

None specifically reported for this incident, though it occurred amid broader California legislative attention (Assembly Bill 303, the 'Battery Energy Safety & Accountability Act') following the earlier Moss Landing battery storage fire in January 2025

(1) Automated thermal detection at a battery storage site can alert emergency services before visible fire signs appear, allowing early site isolation. (2) A contained battery fire at a hybrid solar site can be left to burn out under monitoring when suppression risks outweigh benefits and spread is limited.

In 2023 a fire was reported at an outdoor battery energy storage system co-located with a solar photovoltaic array at the Chaumont Site 1 / Tops Markets solar-plus-storage project in the Town of Lyme, Chaumont, Jefferson County, New York, United States, operated and integrated by Convergent Energy and Power and owned by NSF Chaumont Site 1. The storage system, supplied by GE, used nickel manganese cobalt (NMC) cells and was a small utility-scale installation of single-digit megawatts with a few hours of duration. Available sources indicate the system had been in service for less than six months, and it is not clear whether the wider project had reached full commercial operation. Local authorities issued a precautionary shelter-in-place order for residents within about one mile of the site while the fire was dealt with. Reported physical damage was limited to part of the installation. No injuries or fatalities were reported in available sources.

Lithium-ion (NMC referenced in register text; NYSERDA record lists chemistry generically as Li-ion)

Provisional: village officials stated that mechanical equipment supporting the operation of the solar project malfunctioned, causing the fire; a full root cause investigation was initiated by the operator but results were not reported in available sources.

Four lithium battery storage trailers caught fire within the battery energy storage system enclosure area.

Local and county fire departments, including the Chaumont Fire Department, responded and monitored the fire over multiple days; officials indicated the fire could burn for 24 to 48 hours or up to 5 to 7 days given the difficulty of extinguishing lithium-ion battery fires with water. State officials were also involved in the response and subsequent investigation.

The New York governor announced the creation of a new inter-agency fire safety council/task force to work with first responders on battery storage safety following this and two earlier 2023 New York battery storage fires.

(1) Where a new battery system is in its first months of service, agree in writing which party monitors cell data and who may isolate the unit out of hours. (2) Emergency plans for storage sites near housing must set trigger conditions and communication routes for shelter-in-place orders in advance. (3) At co-located solar and storage sites, response plans must cover how to isolate direct current sources that remain live in daylight.