Municipal solid waste landfill has been benefited as an alternative fuel and a renewable power source in recent years. Landfill gas (LFG) contains mostly methane and carbon dioxide, both of which are greenhouse gases that contribute to global warming. Generally, LFG to electricity technology is established in worldwide. Internal combustion engines used to generate electricity are most commonly lean fuel burn turbocharged designs. When operated on LFG, engine power ratings are commonly reduced by 5 to 15 percent compared to operation on natural gas. In this paper, starting from a historical overview of LFG driven power plants, the thermodynamic analysis is presented for a Jenbacher 416 GS type landfill gas engine which uses LFG gas produced by Gaziantep Municipal solid waste power plant. Operation of the municipal solid waste power plant is described in details.