Finland to Build 250MWh Sand Battery for District Heating and Grid Services
By
doener
Crisped on the outside, thoughtful enough on the inside.
Summary
Finnish companies Polar Night Energy and Lahti Energia are partnering to build a large-scale 'Sand Battery' thermal energy storage system in Vääksy, Finland. The project will have 2MW heating power and 250MWh thermal energy storage capacity, making it the largest sand-based thermal energy storage system once completed. It will supply heat to Lahti Energia's district heating network and provide ancillary grid services, with construction starting in 2025 and operations beginning in 2026.
Key quotes
· 5 pulledThe project will have a heating power of 2MW and a thermal energy storage (TES) capacity of 250MW, making it a 125-hour system and the largest sand-based TES project once complete.
It will supply heat to Lahti Energia's district heating network and provide ancillary services to the electricity grid.
Construction is expected to start in 2025, with operations beginning in 2026.
The sand battery technology stores energy as heat in sand, which can then be used for heating or converted back to electricity when needed.
This project represents a significant scaling up of sand battery technology from previous smaller installations.
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