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World’s largest 1 MW/100 MWh sand battery commissioned in Finland

By District Energy posted 06-11-2025 11:32

  

pv magazine

Summary

Finnish startup Polar Night Energy has announced its industrial-scale sand battery in Pornainen, southern Finland, is now operational following commissioning by district heating company Loviisan Lämpö.

The Pornainen sand battery delivers 1 MW of thermal power and offers a storage capacity of 100 MWh, making it 10 times larger than the world’s first commercial sand-based, high-temperature heat storage system launched in Kankaanpää in 2022 and the largest in the world to date.

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