Project Data -Wisconsin Dairy Farms
Five Star Dairy, an 800-head dairy farm owned by Lee Jensen, operates an anaerobic digester fed by over 26,000 gallons of manure a day. The digester includes an engine generator set that uses the biogas to generate up to 775 kW of electricity, enough power to supply 600 homes.
This project is appealing because it is a hands-free operation for Mr. Jensen. All that he needs to supply is the manure. Microgy will maintain the digester. Dairyland Power Cooperative, a large electrical cooperative based in western Wisconsin, is buying all of the biogas under a 30-year contract. Dairyland owns the on-site generator and will sell the power to its members.
Both the biogas flow from the digester and the airflow in the gas scrubbing process are measured. These two gas streams are added together in order to correctly calculate the methane generated. The project produces a 65% reduction in Biochemical Oxygen Demand (BOD’s) and 40% reduction of total solids.
Wisconsin dairies are not required to reduce their carbon emissions. The motivation for this project was strictly voluntary. The sale of carbon offsets generates an additional revenue which makes this projects profitable; in all three projects the sales of the carbon offsets keeps the project from operating at a loss.
In addition to methane emissions reductions, this project includes the following additional benefits:
- The digester facilities have the ability to process a variety of by products other than manure for improved energy output.
- Digested solids can be used to bed cows or for gardens or landscaping.
- Liquid portion of effluent is more effective as a fertilizer
Elk Mound, WI
Livestock Biogas Capture
Chicago Climate Exchange (CCX) Agricultural Methane Protocol
Chicago Climate Exchange (CCX)