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On the commune's heights, Constant Kieffer is more than a little proud to show what he calls "the cow's stomach." With a half-repressed smile and elfin eye, the Biogas manager likes nothing more that to observe the face of visitors when they first observe the bacterial action in his digester through a peephole. Liquid manure, vegetal waste and vegetable oils are poured into this enormous vat covered with a dome, a medium brought to 38 degrees centigrade and deprived of oxygen. At the end of 40 days, biogas is released, which, when burned, will produce electricity for 700 households and hot water for the heating network: 24 kilometers of pipes that enter houses and supply radiators and water heaters. The residue will be used as fertilizer.

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