Clear science for curious people

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Clear science for curious people

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Since 2008, the Dutch city of Heerlen has used water in its flooded former coal mines to heat and cool homes, shops and offices

A Dutch city found an unexpected energy source 2,000 feet below the surface: the geothermal warmth trapped in flooded coal mines.

By Science Blog Editorial Team · Sep 25, 2026

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Clear science for curious people

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