Abstract
A case of a biogas project built in a large-scale pig farm in Beijing was studied in this paper. The financial evaluation of its economic benefits was calculated by cost benefit analysis. The biogas project can bring about good environmental and social benefit. However, there is little economic attractive without financial subsidy for higher investment of biogas project. When the rate of financial subsidy from government on biogas project is above 73%, the recovery period of investment is shorter than 5 years. It makes a biogas project better economic attractive. The subsidy rate for biogas engineering case was up to 80%. Its recovery period was 4 years, and cumulative net profits 3.02 million RMB, which showed a strong economic attractive.
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