Finland activates world’s largest sand battery to store renewable heat

Finland has launched the world’s largest operational sand battery in the municipality of Pornainen. The facility stores renewable energy as heat and supplies thermal energy to the local district heating network, significantly reducing the area's reliance on fossil fuels.

Built by Finnish company Polar Night Energy and operated by local energy provider Loviisan Lämpö, the sand battery holds approximately 2,000 tonnes of crushed soapstone. It can deliver one megawatt of thermal power and store up to 100 megawatt-hours of energy.