Finland Deploys World's Largest Commercial Sand Battery for District Heating

New Sand Battery in Finland

A town in southern Finland has implemented the world's largest commercial sand battery to store clean energy as heat. The facility, measuring 13 meters tall and 15 meters wide, uses 2,000 metric tons of crushed soapstone to store 100 megawatt-hours of thermal energy.

Addressing Energy Intermittency

The sand battery provides nearly one month of heat demand for 5,000 residents during summer and approximately one week during winter. This technology aims to provide flexible heat production and reduce carbon emissions from the local district heating network, addressing a key challenge for renewable energy sources.

Environmental Impact

Developed by Polar Night Energy and commissioned by Loviisan Lämpö, the project is estimated to have cut greenhouse gas emissions from the heating network by almost 70% and reduced wood chip use by about 60%. The town previously relied on burning oil and wood chips for heating.

Scaling and Future Potential

This installation is approximately ten times larger than a previous version launched in 2022, indicating the potential for sand batteries to play a larger role in emission reduction. Sand batteries offer a storage solution that does not require rare earth materials, unlike some chemical batteries.

Technology and Challenges

The sand battery functions similarly to a large thermos, storing heat in material. While promising for regional heat storage, challenges remain in efficiently converting heat back to electricity and achieving higher energy density compared to traditional batteries.