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"All products and co-products of the fermentation process are utilised; biogas can be converted to electricity and heat, contributing to decentralised energy production and regional energy security. Alternatively, purified gas can be fed into the natural gas grid or used to vehicles. "As far as profitability for the agricultural industry is concerned, a 1,000-acre arable unit putting its entire harvest into biogas to produce one mega-watt of electricity per hour could expect at least a 20% return on the investment". http://www.farminguk.com/index.asp?show=newsArticle&id=5067&country= James Gabriel Duncan BioEnergy and Sustainable Technology Society http://grove.ufl.edu/~bests/