This video explores sand battery technology, which recently launched in Finland, as a significant advancement in thermal energy storage. It discusses the mechanics of how sand batteries function and their potential viability for energy storage solutions, particularly in maximizing renewable energy.
Loviisan Lämpö has commissioned the world’s largest Sand Battery. Developed by Polar Night Energy, the industrial-scale Sand Battery now serves as the main production facility for the district heating network in Pornainen, Finland.
The new Sand Battery delivers 1 MW of thermal power and offers a storage capacity of 100 MWh, making it ten times larger than the Sand Battery launched in Kankaanpää in 2022.
The Sand Battery is expected to reduce annual CO₂-equivalent emissions from the local heating network by around 160 tons, cutting climate emissions in Pornainen’s district heating by nearly 70 percent. The Sand Battery stands about 13 meters tall and 15 meters wide, and it uses approximately 2,000 tonnes of crushed soapstone as its thermal storage medium. In summer, the Sand Bat-tery can cover almost a month’s heat demand in Pornainen, and in winter, close to a week. Read more about the Pornainen Sand Battery:
https://polarnightenergy.com/referenc…
https://polarnightenergy.com/reference/solution-for-clean-energys-big-problem
The worlds largest sand battery is able to supply heat and hot water to a Finnish town for months.
— Massimo (@Rainmaker1973) July 8, 2025
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