An overview is provided of land and marine standards, rules, and guidelines related to fixed firefighting systems for the protection of Li-ion battery ESS. . Battery Energy Storage Systems, or BESS, help stabilize electrical grids by providing steady power flow despite fluctuations from inconsistent generation of renewable energy sources and other disruptions. Both battery technology itself and related regulatory framework are under intense development and, hence, this document represents just a. . ts and explanatory text on energy storage systems (ESS) safety. The standard applies to all energy storage tec nologies and includes chapters for speci Chapter 9 and specific are largely harmonized with those in the NFPA 855 2023 edition.