Biogas consists mainly of methane (CH4) and carbon dioxide (CO2). Methane is a valuable form of gas, as it is an efficient energy carrier with a wide range of uses. The amount of CO2 that is produced corresponds to the amount of CO2 captured when the biomass was created. This means that biogas is a CO2 neutral and renewable source of energy.Biogas is somewhat lighter than air and has an ignition temperature of approximately 700 C (diesel oil 350 C; petrol and propane about 500 C). The temperature of the flame is 870 C. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source. It can also be used in a gas engine to convert the energy in the gas into electricity and heat.