Underground Gravity Energy Storage (UGES) is a new way to store electricity for a long time. It uses old underground mines and sand to store and release energy. By lifting and lowering sand in the mines, UGES can save electricity when there is too much and give it back when needed. Unlike batteries, UGES doesn't lose energy over time, making it very efficient. It is also safer for the environment than other storage methods. UGES can store a lot of energy and help us use more renewable power sources like wind and solar energy.