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Posted September 04. 2013 12:23PM

N.H. firm makes a 'battery' out of air, to power hundreds of homes at once

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Large-scale electricity storage is needed largely because solar and wind power is intermittent, as compared to always-on fossil fuel or nuclear power plants. Storing solar power for use at night or wind power for use in calm periods will be needed if we?re going to transition away from an electric grid that generates greenhouse gases.