El Paso Corporation (El Paso) is an energy company. The Company primarily operates in the natural gas transmission and exploration and production sectors of the energy industry. Its operations are conducted through two segments: Pipelines and Exploration and Production. The Company also has a Marketing segment. As of December 31, 2011, the Company had 1,474 undeveloped locations, of which 575 are in shales where the Company was actively developing reserves. The three shales are Haynesville, Eagle Ford and Wolfcamp. At December 31, 2011, it had 1,918 billion cubic feet of natural gas equivalents of consolidated proved undeveloped (PUD) reserves. Of the 1,918 billion cubic feet of natural gas equivalents of PUD reserves at December 31, 2011, it has 49 billion cubic feet of natural gas equivalents of undeveloped reserves. During 2011, it sold Powder River Basin in Wyoming, and oil and natural gas properties located in the Frio county. On May 25, 2012, Kinder Morgan Inc acquired El Paso.