UL 9540 defines the safety requirements for energy storage systems and equipment. NFPA 855 outlines installation rules that minimize fire risk. In this article, you will know the most important safety standards. If you're planning a. Because of the growing concerns surrounding the use of fossil fuels and a greater demand for a cleaner, more efficient, and more resilient energy grid, the use of energy storage systems, or ESS, has increased dramatically in the past decade. Renewable sources of energy such as solar and wind power. There are many types of energy storage batteries, including lead-acid batteries, lithium-ion batteries, sodium-ion batteries, flow batteries and sodium-sulfur batteries, each with its own characteristics and suitable for different scenarios.