In summary, it is a system in which electricity is produced by “dropping” a heavy load. This electricity can then be used when the need is high. Other times, when there is excess energy in the grid, the gravity battery system uses some of that energy to lift the “load” back.
One of the most common types of this technology is the so-called pumped storage hydropower system. In this system, water is dropped from a very high place and as it flows downhill, it turns turbines to generate electricity. When there is excess energy, the water is pumped back to the starting point.
Austrian scientists have proposed a gravitational energy storage system (UGES) based on depleted mines. He will use elevators to lift and lower containers filled with sand.