Wisconsin continues to be one of the leading states in operating farm-based anaerobic digester systems. The Wisconsin Agricultural Biogas Casebook gives a snapshot with some history of the 17 operating anaerobic digester systems in Wisconsin as of June 2008. Biogas generation information was not available for many of the systems in this report due to the lack of gas metering on older systems. Newer systems include biogas metering; this statistic is expected to be included in future editions of this Casebook. Each system that is generating electricity has a purchase agreement with their servicing utility. Deere Ridge Dairy/Gordondale Farms is an 850 Holstein dairy operation. About 30,000 gallons/day of manure, bedding and milking parlor wastes are generated. Deere Ridge installed the first farm-scale digester designed by GHD Inc in 2001. Target influent solids content is 8%-9%. Design hydraulic residence time is 22 days.