LAMBDA together with its cooperation partner provides otto gas engines especially for the use of landfill gas flows of below 200 m³/h in the output range 80 kW to 250 kW. An optimised gas mixing and gas mixing control mean these units can be operated at a methane concentration of up to 35 %. The use of innovative materials and lubricating oils permits maintenance intervals of 800 to 1,000 operating hours. The combination of long maintenance intervals and inexpensive spare and wearing parts makes profitable operation of these otto gas engines possible even at low power. The standard integrated telemonitoring and telecontrol system means profitable operation of these machines can even be achieved over great distances by an external operator or contractor. The excellent starting characteristics mean cycle operation can be run despite differing methane concentrations.