This storage technique provides a pollution free, economical, long lifespan (over 40 years) and better round- trip efficiency of about 75-85% (depending upon technology used) and a solution for high capacity energy storage.
A gravity-based energy storage system in Rudong, China, is using heavy concrete blocks lifted by surplus wind and solar power to store energy. When demand spikes, the blocks descend, spinning generators to feed electricity back into the grid.
The earliest form of a device that used gravity to power mechanical movement was the , invented in 1656 by. The clock was powered by the force of gravity using an mechanism, that made a pendulum move back and forth. Since then, gravity batteries have advanced into systems that can utilize the force due to gravity, and turn it into electricity for large scale energy storage.
Gravity energy storage provides hundreds of megawatts for several hours. Our energy storage technology stockpiles electricity when it's plentiful, and then returns that same energy back to the grid when demanded. The fast load ramping takes less than 1 second.
Gravity batteries function on a simple principle: lifting a heavy mass stores potential energy, and when that mass descends, the energy converts back into electricity via a generator. Unlike lithium-ion batteries, which lose efficiency over charge cycles, gravity-based storage does.
As we approach Q4 2025, CIMC plans to deploy liquid-cooled storage systems with 95% round-trip efficiency. Paired with Djibouti's planned geothermal plants, this could position the city as East Africa's first fully renewable-powered capital.
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