Molten Aluminum Lakes Offer Power Storage for German Wind Farms
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Germany’s sprint toward renewable energy makes wholesale power cheap, even free, when the sun is shining and the wind is blowing. Absent that, prices spike -- this year the day-ahead price of a megawatt-hour has ranged from 52.68 euros ($65.35) to negative 4.13 euros.
The system doesn’t yet have dedicated storage equipment capable of holding large amounts of renewable energy.