There is a proof of concept using gravel instead of water as well. http://www.en... | Hacker News

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ErikRogneby on Nov 15, 2013 | parent | context | favorite | on: Gravity Battery Concept

There is a proof of concept using gravel instead of water as well.

http://www.energycache.com/ http://www.youtube.com/watch?v=G3nz_kU604s&feature=youtu.be

Tloewald on Nov 15, 2013 [–]

No-one is denying the concept would work -- it's just an enormously expensive way to save remarkably little energy.

A Macbook Pro battery -- 63.5 Wh -- can store as much energy as a 46kg mass suspended in a 500m shaft operating with 100% efficiency. Now, which do you think costs more to build and maintain?

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