The Edinburgh company has developed an energy storage system, known as GraviStore, which raises and lowers heavy weights in underground shafts, which it says offers “some of the best characteristics of lithium-ion batteries and pumped hydro storage”.
Gravitricity said: “The community of Pyhäjärvi, with just 5000 inhabitants, lies 450 kilometres north of Finland’s capital, Helsinki. Nearby lies Pyhäsalmi Mine – Europe’s…