Both the exhaust ventilation requirements and the explosion control requirements in NFPA 855, Standard for Stationary Energy Storage Systems, are designed to mitigate hazards associated with the release of flammable gases in battery rooms, ESS cabinets, and ESS walk-in units. However, exhaust. Explosion-proof requirements for battery energy storage cabine er or larger to be provided with some form of explosion contro undergoing thermal runaway for explosion control safety systems. An approach to determine a flammable battery gas source term to design explosion control s stems has been. UL Standards and Engagement introduces the first edition of UL 1487, published on February 10, 2025, as a binational standard for the United States and Canada. The ARC-VENT blast pa egasketUL50E-UL157 ( -55 ons due to arc flash or gas explosion. This will change with the 2027 IFC, which will follow th. grid support, renewable energy integration, and backup power. This document reviews state-of-the-art deflagration mitigation.