Finland Largest Sand Battery
In the sleepy Finnish village of Pornainen, a 42 foot tall and 50 foot wide building is filled with 2,000 tons of crushed soapstone. This isn’t a silo, it’s the world’s largest sand battery, a revolutionary thermal energy storage device that went live in June 2025. Polar Night Energy developed this behemoth for Loviisan Lämpö and it’s the backbone of Pornainen’s district heating network, reducing carbon emissions by 70% and eliminating the need for oil completely.