An Energy Storage System (ESS) is a system of battery storage devices which are used to reserve energy for future use. In essence, it is a large reserve power system that is used to save energy when it is not in demand to supplement insufficient power in times of high demand.

As a permanent or temporary solution, Energy Storage Systems can be used to meet electrification goals in a timely fashion. Energy Storage Solutions are a modular solution with a broad range of capacity—anywhere from 250KWh to 4MWh. When the energy demand changes, Energy Storage Systems are able to add more storage or remove and redistribute excess power storage to other units.