The storage of electricity is a key component in the climate reduction effort and the transition pro cess toward sustainable energy production Using surplus electricity to move a mass upward and to lower it again when electricity is needed is an extremely efficient means of storing electric power that experts refer to as elevation potential energy Pumped storage power stations are a classic exam ple but require hilly areas and can therefore not be used everywhere By contrast gravity storage sys tems would also work in flatlands They use sur plus electricity to hydraulically pump a mass of rock or concrete of several hundred meters upward When electricity is needed this piston is lowered pushing water through turbines driving generators Giga watts project Engineering In research and development centers all over the world specialists are working on innovative ideas to minimize the footprint of civilization Additional storage ideas can be found at schaeffler tomorrow com just like in a hydro powerplant The system has a minimum efficiency of 80 percent Its storage capacity is huge and would amount to several giga watt hours Equally huge though are the pres sures acting on turbines lines and seals result ing in a correspondingly long to do list before such a system is ready to operate 6

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