MEPUSA is an oil and gas exploration and production company headquartered in Houston, Texas, which currently has a substantial investment in the Marcellus Shale Gas Project in Pennsylvania and markets natural gas through Mitsui & Co. Energy Marketing Services (USA) Inc., another subsidiary of Mitsui & Co., LTD. It also has investment in the Eagle Ford Shale oil & gas project in Texas since 2011, owns another substantial working interest and produces Condensate, NGL and Natural Gas. Through valued partnerships and active drilling programs, MEPUSA is engaged in enhancing and developing reserves through selective acquisitions of both new conventional and unconventional E&P assets in North America.