Grid-Scale Energy Storage Systems By Babu R. Chalamala, David Rosewater, Yuliya Preger, Reed Wittman, Joshua Lamb, and Akira Kashiwakura Ensuring safety. ©SHUTTERSTOCK.COM/LAYERACE.COM E NERGY STORAGE SYSTEMS ARE BECOMING widely deployed throughout the electricity infrastructure. Large-scale integration of energy storage systems will become much more widespread as we begin to integrate larger amounts of renewables. Furthermore, electrification Digital Object Identifier 10.1109/MELE.2021.3115541 Date of current version: 1 December 2021 of the transportation sector will demand fast charging infrastructure and energy storage to handle new loads on distribution systems. However, energy storage systems, especially battery energy storage systems (BESSs), present a range of hazards that make engineering safety of largescale systems a challenge. This article explores engineering safety of grid energy storage systems from the perspective of an asset owner and system operator. We review the hazards of common lithium-ion and aqueous 2325-5897/21©2021IEEE IEEE Electrification Magazine / DECEMBER 2021 19http://www.SHUTTERSTOCK.COM/LAYERACE.COM