Green Power International [P] Ltd. Manufactures Biogas Gensets with High Electrical Efficiency. Green Power International [P] Ltd. Manufactures Natural Gas Gensets or Gas Generators. The Biogas Gensets with High Electrical Efficiency is a well-known and time-tested process, where animal manure can be converted to methane-rich biogas and sludge, which is nearly odourless and useful as a fertilizer. The biogas is a valuable fuel that can be used in a variety of applications in which most important is power generation. It can be converted into compressed natural gas after a scrubbing process that removes carbon dioxide and hydrogen sulphide.