An Energy Storage System (ESS) is a system that stores electrical energy produced by renewable sources, such as solar panels or wind turbines, and discharges it when needed. ESS can help reduce electricity bills by supplementing or replacing electricity from the grid with stored energy from renewable sources. It can also provide backup power during power outages or emergencies. Additionally, an ESS helps reduce carbon emissions and promote sustainability. By storing energy produced by renewable sources, an ESS can supplement or replace electricity from the grid, which can help reduce energy costs.