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Finnish Engineers Unveil Sand Battery for Clean Energy

8/31/2025

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Summary

Story summary

Finnish engineers Markku Ylönen and Tommi Eronen created a sand battery that heats sand to 500°C for energy storage.
A larger prototype in Pornainen targets a 70% reduction in carbon emissions for district heating by using wood chips instead of oil.
The system operates at 90% efficiency, utilizing renewable electricity during low-cost periods.
Polar Night Energy intends to expand projects, highlighting the technology's industrial potential.

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Story summary

Finnish engineers Markku Ylönen and Tommi Eronen created a sand battery that heats sand to 500°C for energy storage.
A larger prototype in Pornainen targets a 70% reduction in carbon emissions for district heating by using wood chips instead of oil.
The system operates at 90% efficiency, utilizing renewable electricity during low-cost periods.
Polar Night Energy intends to expand projects, highlighting the technology's industrial potential.