Storing Power in Molten Aluminum Lakes

A German plant uses its smelter as a short-term megabattery
Trimet Aluminium is Germany’s largest producer of the metal Courtesy Trimet

Germany’s sprint toward renewable energy makes wholesale power cheap, even free, when the sun is shining and the wind is blowing. When the weather’s gray, prices spike. The system doesn’t yet have dedicated storage equipment capable of holding large amounts of renewable energy. Trimet Aluminium, Germany’s largest producer of the metal, is experimenting with one answer: using its vast pools of molten metal as storage batteries .

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