SCE Battery Energy Storage System Safety
Know the risks. Although similar to conventional substations, battery energy storage system (BESS) facilities have a risk of explosion and stranded energy, presenting unique challenges to fire service agencies.
If you are called to an incident involving an SCE BESS facility, always approach with caution. Use a standoff distance of at least 100 feet for all SCE BESS facilities. Do NOT proceed beyond the fenceline of any BESS facility without guidance from a qualified on-site facility subject-matter expert, or SME. The SME should understand the system configuration and battery chemistry under adverse conditions.
Review data to guide operational decisions. The fire alarm/protective system annunciator and battery management system provide the best sources of data.
Consider the potential for a deflagration to occur. A BESS can present an explosion hazard, even without signs of fire. Do not be complacent if there is smoke but fire is not showing. This can, in fact, be a more dangerous situation, as it may indicate the development of an explosive environment.
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An engine company was dispatched to investigate a strange odor reported in a homeowner’s garage. While responding, dispatch reported the presence of a residential BESS facility in the garage. The initial on-scene report noted a visible white haze in proximity to the BESS. The crew immediately went to work evacuating the house, disconnecting power to the BESS and creating a safe standoff distance. About 15 minutes after arrival, the white fog increased in volume and parts of the system were propelled through the open garage door as the BESS rapidly ignited. There were no injuries and the crew was able to prevent the fire from spreading through the attached structure. The Incident Commander attributed the success of this response to knowledge of BESS, proper size-up, situational awareness, and establishing a safe standoff distance.
