A commercial energy storage system is a complex solution--one that is used to store electrical power until later. Its main functions are to balance energy supply with requests, offer enough backup power for stand-alone use, and allow the cutting of peak loads in order to decrease electricity costs. Technological aspects of these systems include advanced battery technology, intelligent use BMS software and high-efficiency power systems. Used in all aspects of industry from electric power plants to commercial buildings and renewable energy farms, they guarantee energy is used reliably and with the maximum possible efficiency. These systems store energy during off-peak hours, when electricity rates are usually cheaper than at other times. They then revert to stored energy sources rather than using electricity from a remote source (pulling power off the grid) during peak load periods. This cuts down on energy consumption and leads directly to reduced operational costs.