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Re:Solar and Wind Energy May Be Nice, but How Can We Store It? by ccvannorman on Wednesday April 06, 2016 @03:47AM (#11437294)
LightSail energy [0] has been working on this problem for the past five years. They store the energy in (surprise!) highly efficient, long-term storage air compressors.

[0] crunchbase.com/organization/lightsail-energy -- $42M funded

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