Energy Outputs and Financial Returns of On-Farm Biodigester Systems in the United States: A Case Study in Vermont
International Journal of Sustainable and Green Energy
Volume 6, Issue 2, March 2017, Pages: 10-18
Received: Feb. 20, 2017;
Accepted: Mar. 14, 2017;
Published: Apr. 11, 2017
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Qingbin Wang, Department of Community Development and Applied Economics, University of Vermont, Burlington, USA
Ethan Thompson, Department of Community Development and Applied Economics, University of Vermont, Burlington, USA
Laurel Valchuis, Department of Community Development and Applied Economics, University of Vermont, Burlington, USA
Robert Parsons, Department of Community Development and Applied Economics, University of Vermont, Burlington, USA
This study assesses the investments, energy outputs, and financial returns of on-farm anaerobic digester systems (ADS) by farm size through a case study in Vermont and discusses the potential policy implications. Detailed data on the initial investments, production of electricity and other marketable products, operational expenses, and income, collected through surveys of eight operating ADS on dairy farms in Vermont, are used to estimate the return on equity (ROE), return on assets (ROA), and other financial indicators for small, medium, and large farms. The primary survey data indicate that the average investment was $1.35 million for small and medium farms (75-500 cows) and $2.44 million for large farms (>500 cows). Financial analysis indicates that the ROE and ROA were 12.54% and 13.50% for large farms but only 0.73% and 1.07% for small and medium dairy farms, respectively. Whereas the technology of ADS developed in the United States seems to favor large farms in terms of both energy production and financial returns, the centralized ADS developed in Europe and low-cost mini digesters developed in China may have potentials for small and medium farms to develop more economically viable ADS in the United States.
Energy Outputs and Financial Returns of On-Farm Biodigester Systems in the United States: A Case Study in Vermont, International Journal of Sustainable and Green Energy.
Vol. 6, No. 2,
2017, pp. 10-18.
Vermont Agency of Agriculture, Food & Markets. (2015). Vermont Dairy: The Number of Dairy Farms in Vermont. Retrieved from http://www.vermontdairy.com/learn/number-of-farms/
MacDonald, J. M., O’Donoghue, E. J., McBride, W. D., Nehring, R. F., Sandretto, C. L., & Mosheim, R. (2007). Profits, Costs, and the Changing Structure of Dairy Farming (No. ERR-47). Economic Research Service / USDA.
Wang, Q., Thompson, E., Parsons, R., Rogers, G., & Dunn, D. (2011). Economic feasibility of converting cow manure to electricity: A case study of the CVPS Cow Power program in Vermont. Journal of Dairy Science, 94 (10), 4937–4949. doi:10.3168/jds.2010-4124.
U. S. Environmental Protection Agency. (2015). AgSTAR Digesters. Retrieved from http://www.epa.gov/agstar/agstar-data-and-trends.
IEA Bioenergy. (2014). Economic Sustainability of Manure Based Centralised Co-Digestion. Retrieved from http://www.iea-biogas.net/files/daten-redaktion/download/publications/country-reports/november2013/Countryreport2013.pdf
Wang, Q., Thompson, E. (pending). Converting animal manure into energy products through on-farm biodigesters: A comparative analysis of the development in the U.S. and China.
Raker, M. (2011). CVPS Renewable Development Fund: Progress Report. CVPS Renewable Development Fund Executive Committee.
U. S. Environmental Protection Agency. (2014). AgStar: Operating Anaerobic Digester Projects. Retrieved February 24, 2014, from http://www.epa.gov/agstar/projects/
Kearney, T. E., Larkin, M. J., & Levett, P. N. (1993). The effect of slurry storage and anaerobic digestion on survival of pathogenic bacteria. Journal of Applied Microbiology, 74 (1), 86–93.
Hogan, J. S., Smith, K. L., Hoblet, K. H., Todhunter, D. A., Schoenberger, P. S., Hueston, W. D., … Brockett, B. L. (1989). Bacterial counts in bedding materials used on nine commercial dairies. Journal of Dairy Science, 72 (1), 250–258.
Rendos, J. J., Eberhart, R. J., & Kesler, E. M. (1975). Microbial populations of teat ends of dairy cows, and bedding materials. Journal of Dairy Science, 58 (10), 1492–1500.
Noordhuizen, J., & Metz, J. H. M. (2005). Quality control on dairy farms with emphasis on public health, food safety, animal health and welfare. Livestock Production Science, 94 (1), 51–59.
Nicholson, F. A., Groves, S. J., & Chambers, B. J. (2005). Pathogen survival during livestock manure storage and following land application. Bioresource Technology, 96 (2), 135–143. doi: 10.1016/j.biortech.2004.02.030.
Raizman, E. A., & Wells, S. l. (2003). The Distribution of Mycobacterium avium paratuberculosis in the Environment and its Association with Infected Herds of Minnesota Dairy Farms. Retrieved from http://conservancy.umn.edu/handle/11299/108991
Sischo, W. M., Atwill, E. R., Lanyon, L. E., & George, J. (2000). Cryptosporidia on dairy farms and the role these farms may have in contaminating surface water supplies in the northeastern United States. Preventive Veterinary Medicine, 43 (4), 253–267. doi: 10.1016/S0167-5877 (99)00107-5.
Gould, B. (2012). USDA Dairy - Number of Operations by Herd Size. Retrieved from http://future.aae.wisc.edu/usda_dairy/dairy_data/index/2
Penn State Extension. (2013). Farm-Based Anaerobic Digestion Practices in the United States — Biogas and Anaerobic Digestion. Retrieved from http://extension.psu.edu/energy/waste-to-energy/biogas/links/history-of-anaerobic-digestion/farm-based-anaerobic-digestion-practices-in-the-united-states
Thompson, E., Wang, Q., Li, M. (2013). Anaerobic digester systems (ADS) for multiple dairy farms: A GIS analysis for optimal site selection. Energy Policy, 61, 114-124. doi: 10.1016/j.enpol.2013.06.035.
Jansson, A., Hammer, M., Folke, C., & Costanza, R. (1994). Investing in Natural Capital: The Ecological Economics Approach To Sustainability. Island Press.
Bond, T., & Templeton, M. R. (2011). History and future of domestic biogas plants in the developing world. Energy for Sustainable Development, 15, 347–354. doi: 10.1016/j.esd.2011.09.003.
Wilkie, A. C. (2005). Anaerobic digestion of dairy manure: Design and process considerations. Dairy Manure Management: Treatment, Handling, and Community Relations, 301–312.