We have to find alternative solutions, ” he said. Biogas is made by fermenting organic materials — generally crops and waste.... We collect the gas that comes from the fermentation, ” he said. The gas from their plant could meet the needs of 2, 000 homes.... It will be purified into bio-methane and injected into a pipeline to the nearby town of Rambouillet, heating its hospital, swimming pool and homes.“ It’s cool, ” said Robin....