"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/