Battery energy storage system (BESS) is a technology that allows excess power generation to be stored and discharged at a later time to provide electricity or other services to the grid when needed, thereby increasing the efficiency and flexibility of the power system and providing uninterruptible power during periods of low production. Energy storage technologies are a key solution to provide backup power, diversify the supply mix, lessen the impact of extreme weather events, and ultimately help build a more resilient grid.

It is a technology at the service of renewable energy sources, which do not pollute, are inexhaustible and reduce the use of fossil fuels, the source of greenhouse gas emissions that cause global warming. They are also indigenous and available in almost all parts of the world, which helps to reduce energy imports and create wealth and employment locally.