Photos: Barnyard energy

Five Star owner and General Manager Lee Jensen. Five Star sells the biogas produced by the digester to a utility. It will take about 10 years for the revenue from gas sales to pay off the digester, he said, but in the meantime, the farm can cut costs in other ways. The liquids at the end of the process can be used as fertilizer while the solids are comfy cow beds. Neither the liquids nor cow beds smell nearly as bad as the manure did the first time around.

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 ...