An FAQ overview of US installation codes and standard requirements for ESS, including the 2026 edition of NFPA 855 and updates to UL 9540A. This document offers a curated overview of the relevant codes and standards (C+S) governing the safe deployment of utility-scale battery energy storage. NFPA is keeping pace with the surge in energy storage and solar technology by undertaking initiatives including training, standards development, and research so that various stakeholders can safely embrace renewable energy sources and respond if potential new hazards arise. NFPA Standards that. Provides guidance on the design, construction, testing, maintenance, and operation of thermal energy storage systems, including but not limited to phase change materials and solid-state energy storage media, giving manufacturers, owners, users, and others concerned with or responsible for its. This document is meant to be used as a customizable template for federal government agencies seeking to procure lithium-ion battery energy storage systems (BESS). Integrate a BESS with solar photovoltaic (PV) to smooth power outputs. Other use cases include. This work was funded by the United States (U. ) Department of Energy, Office of Electricity, through the Energy Storage Program under the direction of Dr. The Infrastructure Investment and.