PPL Renewable Energy, a subsidiary of PPL Corp., will develop and install a 6.4MW methane-to-electricity power generation system at the Community Refuse Service Landfill in Shippensburg, Pennsylvania. Community Refuse Service Landfill, an affiliate of Interstate Waste Services, will provide 3.2 million cubic feet of methane gas every day to power four Caterpillar generators at the 250-acre facility. The companies expect the project to be operational by 31 December 2008. Methane-to-energy systems at landfills have a dual benefit for the environment; they generate electricity from renewable fuel while also eliminating emissions of methane, a gas that contributes to global warming.