Green Power International [P] Ltd. Manufactures Power Generation on Landfill Gas Genset. Green Power International [P] Ltd. Manufactures Natural Gas Gensets or Gas Generators. The Power Generation on Landfill Gas Genset is used for Landfill gas which is produced by wet organic waste decomposing under anaerobic conditions in a landfill. The waste is covered and compressed mechanically and by the weight of the material that is deposited from above. This material prevents oxygen from accessing the waste and anaerobic microbes thrive. This gas builds up and is slowly released into the atmosphere if the landfill site has not been engineered to capture the gas.