World’s Biggest Sand Battery Begins Operation in Finland Updated On Thu, Jun 12th, 2025 by Saurenergy Finnish startup Polar Night Energy has commissioned the world’s largest sand battery in Pornainen, in collaboration with the local district heating provider, Loviisan Lämpö. Towering nearly 13 metres high and 15 metres wide, the sand battery uses around 2,000 tonnes of crushed soapstone to store thermal energy. With a 1 MW heat output and 100 […] Read more
