It allows batteries to store energy from the grid or renewable sources and then release it back as usable AC power when needed. Makkays Battery Energy Storage Systems (BESS) are engineered for reliable energy storage, peak shaving, backup power, and renewable integration. Explore our BESS platforms and click a product to instantly view configurations, technical highlights, and recommended applications. What does Qstor™ bring to your system? Our advanced Qstor™ solutions are designed to cater to the distinct. A battery energy storage system (BESS), battery storage power station, battery energy grid storage (BEGS) or battery grid storage is a type of energy storage technology that uses a group of batteries in the grid to store electrical energy.