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Breakthrough grid-scale renewable energy storage in a battery made from... grav
Treehugger: Renewable energy production is going up rapidly - worldwide solar power capacity is up 53X in the past 9 years - but to reach the finish line, the world will also need a lot of cheap energy storage. That's because wind and solar power are intermittent, and sometimes they produce more than we need and sometimes not enough; if we can store energy when there's a surplus, we can then use it when there's a deficit and smooth things out.
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