Plants in Germany partially powered by electricity produced from animal dung . The resulting biogas , mainly comprised of methane and carbon dioxide , rises naturally through vents in the ceiling to a corrugated hut on the roof where it 's collected in a `` big balloon , '' says park supervisor Dominik Forster . Animal waste fermented for several days generates ` ` biogas '' Energy produced enough to heat 25 homes and feed 100 .
Plants in Germany partially powered by electricity produced from animal dung . Animal waste fermented for several days generates ` ` biogas '' Energy produced enough to heat 25 homes and feed 100 .