Gravity energy storage, or gravity batteries, is an emerging technology that utilizes gravitational potential energy for large-scale, sustainable energy storage. In a common application, when renewable energy sources such as wind and solar provide more energy than is immediately. Gravity energy storage systems (GESS) for grid support and renewable energy integration. We build a piston of reinforced rock in the shaft. A conventional pump/turbine. The weight is lifted back to the top under renewable power when the sun is shining or the wind is blowing, or when traditional energy is cheaper, or by switching the hoisting system to a generator to help bring the weight back up. Energy Vault SA implements large-scale projects building energy storage systems including gravity-based, battery-based and green hydrogen-based, managed by its proprietary energy. GraviLock is a modular, gravity-powered energy system designed to generate clean, off-grid electricity with minimal maintenance and maximum reliability. Unlike solar and wind, it doesn't depend on daylight or weather, and it doesn't require chemical batteries.