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A highly energy-intensive transformation
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Cooling the water of a lake, like Lake Servières in the Puy-de-Dôme department, and turning it into ice requires considerable energy. Liquid water needs 4.18 joules per gram of water to cool by 33.8° F (1° C) and 334 joules per gram to solidify. As an example, the change from 68° F (20° C) to 39.2° F (4° C) in a lake the volume of Lake Geneva corresponds to the annual electricity consumption of Norway.
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