The rapid deployment of grid-scale Battery Energy Storage Systems (BESS) to support renewable energy integration introduces complex fire and explosion hazards that challenge traditional safety frameworks. In Australia, a Fire Safety Study (FSS) prepared under HIPAP2 guidelines are a prerequisite for regulatory approval. However, these frameworks often lack provisions for emerging technologies and high-energy chemistries. This presentation will examine the application of NFPA 855:2026, the latest global standard for energy storage systems, and Large-Scale Fire Testing (LSFT) methodologies, including UL9540A and CSA C800 protocols, to enhance the robustness of FSS for grid-scale installations.