Storing wind and solar with new gravity-based system

Scottish start-up Gravitricity is planning a project to store surplus power from renewables at Port of Leith. A 250 kW, grid-connected prototype facility will have its ability to stabilize the network tested. The system involves a 16m rig over a 150-1500m shaft.Scottish start-up Gravitricity has developed a gravity energy storage system it says is perfect for storing solar and wind power. A 16m-high rig uses the clean power to raise a mass in a 150-1500m shaft and discharges the electricity thus 'stored' by releasing the mass to rotate an electric generator. Gravitricity said the mass used can ...

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