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Summary
US periodical Time Magazine has included a Finnish company's "sand battery" on its list of 300 of the most impactful inventions of 2025.
The sand battery was included in the list's green energy category. The company behind the technology is Polar Night Energy. The firm's 'biggest sand battery in the world' is located in Southern Finland's municipality of Pornainen.
In layman's terms, a sand battery stores high-temperature thermal energy collected from solar and wind-generated heat sources that can be used in various applications — including heating buildings.
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