New York City Moves on Using Methane for Power - NYTimes.com

By MIREYA NAVARRO

Published: February 8, 2011

"Heating fuel can be extracted from sludge and butanol, an alternative fuel to gasoline, from the algae generated by wastewater. Sewage treatment plants could sell methane gas to provide power to homes. Such projects represent a more sustainable long-term approach to managing a wastewater treatment process that costs the city about $400 million annually, not including capital investments."