Biogas is a by-product of the anaerobic treatment of organic waste. The methane, the main constituent of biomass biogas, is a pollutant with potential greenhouse up to 30 times greater than CO2 [1]. The biogas combustion using a low-pressure burner is an adopted strategy to reduce the polluting effect, however, the thermal energy released in this process is often wasted, thrown directly into atmosphere. Methane is a gas with great low heating value – LHV and in organic waste treatment plants the methane concentration could reach around 60-80% in biogas [2]. This has encouraged use this biofuel as source of thermal energy and it can be used to fuel internal combustion engines for vehicular application or power generation, when used in power generators units. At UFMG, one treats organic waste produced in the university restaurants. In order to avail of the biogas energy made in this waste treatment plant, it was proposed the use of an electronic controlled spark ignition engine assembled in a power generation unit, fed by biogas, to convert the thermal energy released into a controlled combustion of biogas into electric power. To evaluate how efficient is the use of biogas in internal combustion engines, the multi cylinder power generation unit fuelled by biogas was tested to measure the power conversion from biogas to electric power.