A couple of elaborate Lister(oid) CHP systems.
Lots of work gone into these....
http://www.youtube.com/watch?feature=player_embedded&v=F9E_SVAvgss#! (http://www.youtube.com/watch?feature=player_embedded&v=F9E_SVAvgss#!)
http://www.youtube.com/watch?v=OxXL4yxRNBQ (http://www.youtube.com/watch?v=OxXL4yxRNBQ)
veggie