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Biomass gasification technology has been developed in Indonesia in the last 30 years. During those years, this technology has become one of the choices as a decentralized power plant for remote area. However, the use of synthetic gas directly on diesel engine and steam turbine for electricity generation has a relatively low efficiency. On the other hand, synthetic gas can be used as raw material for Fischer Tropsch (FT) process, a process for manufacturing synthetic diesel and gasoline in high temperature. Because of its high temperature, the exhaust heat can still be used for steam power plant. This paper consists of a study for synthetic gas production from corncob-s gasification which then can be used as FT process-s raw material. Product-s economic level is compared with conventional process. Previous studies show that gasifier optimal temperature is between 800 to 1,000oC. Simulation shows that this approach can produce FT fuel (diesel oil equivalent) 58 million litres per year and electricity 400 GWh per year. With raw material capacity of 300,000 tonnes/year, calculated FT fuel production cost is 6,569 IDR/liter and electricity production cost are 245 IDR/kWh (about 22% of PLN-s average tariffs 1,123 IDR/kWh).