A worker filling up the bus with roadgas. The UKs first bus powered entirely by human and food waste, in service between Bristol and Bath. The 40-seat Bio-Bus runs on biomethane gas generated through the treatment of sewage and food waste. It is nown locally as the Poo bus! It is run by the Bath Bus Company The biomethane gas is generated at Bristol sewage treatment works in Avonmouth, which is run by GENeco, a subsidiary of Wessex Water.