Poo Power Could Supply All of Toronto Zoo’s Electricity Needs and Then Some

"... [T]he zoo estimates that its 5,000 animals produce enough manure to power a biogas-to-electricity plant which not only would be able to supply all of the zoo’s needs, but sell enough power back to the grid that the entire project would pay for itself within five years."


http://www.treehugger.com/files/2008/11/poo-power-could-supply-all-of-toronto-zoo-electricity.php