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Iran is on the verge of elimination of energy subsidies. This means a sudden increase in prices such as gas, electricity, etc.... On the other hand, the different means of the different means of energy production is a great concern for human being. Amongst all different methods of energy production, renewable energy is paid more and more attention due to the least consequences concerning the diverse climate change effects. However, the economic factors are also important in order to bring a project into reality. In this paper, the potential of biomass energy in an industrial scale is investigated under this great change on national policies. Then the economic analysis of an industrial biogas system in a rural area near the province of Tehran, the capital of I.R.I., as a case study is illustrated .In this process several products will be produced such as organic compost by anaerobic fermentation of agricultural and organic wastes, liquid fertilizer, Methane and Carbonic gases, electricity and heating. The results of economical evaluation shows that the use of methane-fired generators for the production of electricity is economical because of the high amount of biogas production. So, the revenue gained from produced electricity is more than produced compost. Also, in the process of biogas production, the huge amount of Carbonic gas will be produced which can be used after purification in industry. The result show a promising future for the use of bio gas, specially under new policies of zero energy subsidies for households , commercial, and public use.

Economic Evaluation of an Industrial Biogas System for Production of Gas, Electricity and Liquid Compost