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Biogas is one of the alternative energies to overcome the increasing demand of electrical energy in Indonesia due to both population and industrial growths. In the growing cities, one source of biogas is the municipal waste. This study examined a biogas power plant proposal in Bantar Gebang which receives supply of approximately 6500 tonnes of garbage per day from all parts of Jakarta. It is assumed that a mixture of 60-70% CH4, 30-40% CO2 and other gases such as H2S is produced from anaerobic digestion. The overall heating value of this mixture is 6-24 MJ/m3, which is a half of the heating value of natural gas. Iron sponge is used to remove acid gases. The plant size is 2 ha which is located near the Bantar Gebang Integrated Landfill. Both gas and steam turbines are used to produced electricity. The produced electricity is sold to PLN, with price US$ 0.10 per kwh. With the 44.2 MWh/year electricity production, the income of this biogas power plant is around US$6 Million per year. The CAPEX is US$9,935,838 and OPEX is US$1,697,375.09 with the IRR 17%, ROI 32%, NPV US$ 4,471,949.2, and Payback Period in 6.8 years of production. These figures show that the biogas electricity plant is profitable.