"San Antonio is Going Green with Sewage"
"The San Antonio Water System will sell captured methane gas generated from the utility's treatment of 140,000 tons of biosolids, or sewage, from customers each year. The city-owned utility's board of trustees approved a contract to provide at least 900,000 cubic feet of natural gas daily for the next 20 years. 'Treating these biosolids generates an average of 1.5 million cubic feet of gas a day,' said Steve Clouse, the water system's chief operating officer. 'That's enough gas to fill seven commercial blimps or 1,250 tanker trucks each day'."