Potential GHG Emissions Reductions From Biogas in Wisconsin
Marcie Nelson
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Adviser(s): Dr. Shiba Kar
Abstract: Biogas is a renewable energy resource that results from the breakdown of organic matter in the absence of oxygen, producing a gas similar to natural gas containing methane and carbon dioxide. Its production offsets methane emissions—having 21 times the warming impact of carbon dioxide over a 100-year time frame— that would have occurred through the degradation of organic materials into the atmosphere, and its combustion and use as an energy resource offsets carbon dioxide emissions that would result from fossil fuel energy use. There are many other benefits of biogas production including useful coproducts, economic opportunity, and increased energy independence that are outside the scope of this study. Wisconsin is an excellent candidate for biogas production due to its large agricultural, dairy, and food processing sectors.
To the knowledge of the researcher, no study has assessed the total energy benefits and emissions reductions potential of biogas production and use in Wisconsin. This study aims to address this information gap through the performance of a mathematical aggregate analysis of the amount of fossil fuel electricity generation and greenhouse gas emissions that could be avoided through biogas production and use in Wisconsin.
This study draws conclusions of total electricity generation and emissions reductions potentials from biogas in Wisconsin from the comparison of two scenarios: 1) Emissions from organic material degradation from sources including manure, wastewater, industrial food processing waste, and landfills and emissions from coal fired electricity generation continue as usual and 2) Biogas is produced and used for electricity generation, replacing emissions in Scenario 1 with the lesser emissions resulting from the combustion of biogas.
It is hypothesized that the study will reveal a significant decrease in greenhouse gas emissions and that emissions reductions will be accompanied by an increase in renewable energy electricity generation for Wisconsin. This study may show that biogas potential in Wisconsin has been undervalued by policymakers, and that this value should be reflected in Wisconsin energy policy through further incentivizing biogas production across Wisconsin’s economic sectors.