Energen Resources Corporation, also known as ERC, is one of the largest oil and gas exploration and production facilities in Texas. The company maintains more than 1.75 trillion cubic feet of oil and natural gas liquid reserves. It is a member of the Texas Excavation Safety System. Energen Resources Corporation distributes gas through to residential, commercial and industrial customers through its distribution facilities. The company is a part of Energen Corporation, which is a diversified energy holding company with specialization in the acquisition and development of natural gas, oil and natural gas liquids throughout North America. Operational since 1978, the parent company assists with project and day-to-day operation management services.