Eagle Rock Energy Partners, L.P., together with its subsidiaries, engages in gathering, compressing, treating, processing, transporting, marketing, and trading natural gas, as well as fractionating and transporting natural gas liquids (NGL). The company has natural gas gathering and processing assets in the Texas Panhandle, east Texas/Louisiana, south Texas, and the Gulf of Mexico. Its natural gas gathering systems comprises approximately 5,583 miles of natural gas pipelines with approximately 2,800 well connections, and 17 natural gas processing plants with approximately 704 million cubic feet per day of plant processing capacity. The company is also involved in developing and producing oil and natural gas properties located in various oil and gas producing regions, including southern Alabama, which consists of gathering, processing, and treating assets; the Mid-Continent that includes areas in Oklahoma, Arkansas, Texas Panhandle, and North Texas; Permian, which comprises areas in west Texas; and east/south Texas/Mississippi assets. As of December 31, 2011, it had interest in 591 gross operated productive wells and 1,197 gross non-operated wells; and proved reserves of approximately 234.0 billion cubic feet of natural gas, 11.5 million barrels of crude oil, and 11.3 million barrels of natural gas liquids. Eagle Rock Energy GP, L.P. serves as the general partner of the company. Eagle Rock Energy Partners, L.P. is based in Houston, Texas. Eagle Rock Energy Partners, L.P. operates as a subsidiary of Eagle Rock Holdings, L.P.