The idea is called Mountain Gravity Energy Storage (MGES) and is a riff off hydroelectric power and replaces batteries with sand or gravel reservoir. Mountains with suitable differences in their elevation are selected and the material, in this case sand or gravel reservoirs, is stored at an upper storage site for weeks, months, or years. Once it is time, the material is moved back down. One of the researchers says you can easily alter the speed of the cables, increase the load, or change the number of vessels to meet varying energy demands. The annual cost of storing energy using this method is between $50 KwH to $100 KwH.
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