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Cheapest form of energy storage?

renewable beast

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Whats a cheaper form of storage than this Gravitricity concept? Have you guys ever heard of this?

Energy Stored as Gravity - Clean, Efficient, Safe

It seems like once the technology gets rolled out there really can't be too many cheaper energy storage options. This concept will surely play a significant role in moving towards 100% renewable power grids. 

I haven't found any others quite like this though. Any more out there?

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