Sand batteries could store renewable energy

Could power from wind farms be stored in sand batteries when the wind isn't blowing

Could power from wind farms be stored in sand batteries when the wind isn't blowing? Source: Getty / VCG/VCG via Getty Images

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Researchers in Finland have installed the world's first fully working "sand battery" which can store power from renewable sources for months at a time.

This story was originally produced for the BBC World Service.
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