In the U.K., former mining communities across the country could find a new lease of life — with old mine shafts turned into high-tech green energy stores.

This is the plan of energy startup Gravitricity, which received a £650,000 grant from Innovate UK, the U.K. government’s innovation agency, for their plan to harness the power of gravity to store renewable energy. Their technology uses a massive weight suspended in mine shafts to capture “green” power, and then release it in seconds.

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