Landfill gas is an interesting source of prime energy since it contains about 50-55 vol.% methane. Utilization, however, must take into account the traces of halogenated hydrocarbons and H2S, which are present in the gas. The paper reports of 2 years experience with a pilot plant for the production of a gas with natural gas quality. Essentially the process consists of two stages, an adsorption stage for the separation of the trace components and a membrane unit for the separation of CO2. The process is discussed in detail and compared with alternatives for the utilization of landfill gas such as power generation by gas engines/generator, if desired in combination with a waste heat boiler.