Found on the D Magazine Frontburner blog: The state of Texas has recently begun an ambitious experiment with a Dallas area landfill. They will be using the landfill to generate natural gasses. The project is expected to produce enough gas to meet the needs of an estimated 16,000 households. It is currently in the process of being converted.
http://frontburner.dmagazine.com/2008/07/14/trash-talking-about-the-mccommas-landfill/