Energy storage systems (ESS) store electricity for later use, while charging piles (EV chargers) deliver power directly to electric vehicles. They serve complementary roles but aren't. This help sheet provides information on how battery energy storage systems can support electric vehicle (EV) fast charging infrastructure. It is an informative resource that may help states, communities, and other stakeholders plan for EV infrastructure deployment, but it is not intended to be used. What is an energy storage charging pile? An energy storage charging pile refers to a device designed to store electrical energy, which can then be used to charge electric vehicles or other energy-consuming devices. Its function is similar to the gas dispenser in a gas station.