Photos: Barnyard energy

Five Star Dairy in Elk Mound, Wisc., installed a thermophilic digester about a year ago. Its 900 cows provide enough manure to generate enough power for about 600 homes.

Five Star Dairy

By Bill Detwiler

Bill Detwiler is Editor in Chief of TechRepublic and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the ...