Project Data -Wisconsin Dairy Farms
Three Wisconsin dairies, the Five Star, the Wild Rose, and Norswiss Farms, all work together for this project. These three Wisconsin facilities house over 3,000 cows. The digesters are fed by approximately 98,300 gallons of manure per day. The project has an annual energy production of 20,878 MWh and an annual emission reduction of 65,000 Metric Tons C02e
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.
The 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 these 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, LaFarge and Rice Lake, WI
Livestock Biogas Capture
Chicago Climate Exchange (CCX) Agricultural Methane Protocol
Chicago Climate Exchange (CCX)