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June 12,2025

World’s Largest Sand Battery Launches in Southern Finland

Finnish startup Polar Night Energy has launched the world’s largest sand battery in Pornainen, now operational through district heating firm Loviisan Lämpö. Delivering 1 MW thermal power with 100 MWh capacity, it uses 2,000 tons of crushed soapstone and can meet local heat demand for up to a month in summer.

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