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Chesapeake Energy Corporation was founded in 1989 and is based in Oklahoma City, Oklahoma.Chesapeake Energy Corporation, an oil and natural gas exploration and production company, engages in the acquisition, exploration, and development of properties for the production of crude oil and natural gas from underground reservoirs. It also provides marketing and midstream services for natural gas and oil for other working interest owners in properties it operate. Chesapeake Energy Corporation properties are located in Oklahoma, Texas, Alabama, Arkansas, Louisiana, Kansas, Montana, Colorado, North Dakota, Nebraska, New Mexico, West Virginia, Kentucky, Ohio, New York, Maryland, Michigan, Mississippi, Pennsylvania, Tennessee, Utah, Virginia, and Wyoming. As of December 31, 2008, it owned interests in approximately 41,200 producing natural gas and oil wells; and had 12.051 trillion cubic feet equivalent of proved reserves.

China Huaneng Group (CHNG) is one of China's five largest power conglomerates. China Huaneng Group oversees the national government's interests in 10 subsidiaries, including a 51% stake in Huaneng Power International. Through subsidiaries it develops and operates more than 85 thermal and hydro power plants. In addition to its power-generation business, China Huaneng Group plans to enter other sectors, including finance, transportation, information technology, and renewable energy. In 2008 CHNG acquired Singapore-based Tuas Power from Temasek Holdings for $4.2 billion.

China Petroleum and Chemical Corporation (Sinopec Corp.) is the largest refiner and petrochemical producer in China. Its parent, state-owned China Petrochemical (Sinopec Group), reorganized in 2000 and pooled the best of its assets as Sinopec Corp. Sinopec Corp.'s businesses include oil and gas exploration and production; crude oil processing; oil products trading, transportation, distribution, and marketing; and petrochemicals manufacturing. It has proved reserves of 4 billion barrels of oil and more than 7 trillion cu. ft. of gas, and owns more than 29,000 gas stations. The government of China controls about 75% of the company through the Sinopec Group.

Cimarex Energy's energy is devoted to oil and gas exploration and production. The independent is focusing its operations on the Midcontinent, Gulf Coast, Permian Basin, and Gulf of Mexico. Cimarex Energy Co. reported proved reserves in 2008 of about 1.1 trillion cu. ft. of natural gas and 45.2 million barrels of oil and natural gas liquids. Cimarex Energy participated in drilling 450 gross wells (about 280 net) during 2008. That year company-operated wells accounted for 83% of its total proved reserves and some 81% of it total production (of 22,940 barrels of oil per day).

Clayton Williams Energy, Inc. was founded in 1991 and is headquartered in Midland, Texas.Clayton Williams Energy, Inc., an independent oil and gas company, engages in the exploration for and production of oil and natural gas properties primarily in Texas, Louisiana, and New Mexico. As of December 31, 2008, it had 6,704 gross producing oil and gas wells; leasehold interests in approximately 1.2 million gross undeveloped acres; and proved reserves of 228.6 billion cubic feet of natural gas equivalents. Clayton Williams Energy, Inc. also has equity interest in a joint venture with Lariat Services, Inc. to construct, own, and operate 12 drilling rigs. In addition, Clayton Williams Energy owns and operates natural gas service facilities consisting of 94 miles of pipeline, 3 treating plants, 1 dehydration facility, 3 compressor stations, and 4 wellhead type treating and compression facilities.

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