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In reply to: http://irreal.org/blog/?p=7421

Storing Energy with Concrete Blocks | Irreal
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A startup named Energy Vault is leveraging the idea by storing energy by using cranes to lift concrete blocks and recovering the energy by letting gravity lower the blocks against the cranesโ€™ motor to regenerate the electricity. Surprisingly, the system is almost as efficient as lithium-ion batteries.

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