Carrizo Oil & Gas, Inc. was founded in 1993 and is based in Houston, Texas.Carrizo Oil & Gas sees its future in 3-D. Carrizo Oil & Gas, Inc. is an independent exploration and production company that explores for oil and gas in the Barrett Shale play of North Texas, and in proven onshore fields along the Gulf Coast of Texas and Louisiana, Carrizo aggressively acquires 3-D seismic data and arranges land lease options in conjunction with conducting seismic surveys. As part of a new strategy, Carrizo Oil & Gas, Inc. is exploiting the Marcellus Shale play (New York, Pennsylvania, West Virginia and Virginia). Carrizo has additional properties in the Rockies, Alabama, Arkansas, Kentucky, New Mexico, and in the North Sea. In 2008 the firm reported proved reserves of 432.1 billion cu. ft. of natural gas equivalent.

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.

CNOOC Limited was founded in 1982 and is headquartered in Central, Hong Kong.CNOOC Limited, together with its subsidiaries, engages in the exploration, development, production, and sale of crude oil, natural gas, and other petroleum products in offshore China. The company's oil and gas properties are located in offshore China, which include Bohai Bay, western south China Sea, eastern south China Sea, and east China Sea, as well as in Indonesia, Australia, and Africa. As of December 31, 2008, it had net proved reserves of 2.6 billion barrels of oil equivalent.CNOOC Limited operates as a subsidiary of China National Offshore Oil Corporation.

Cogentrix Energy serves up a power treat for customers, albeit a small one, through its electric generating facilities.Cogentrix Energy develops, owns, and operates a handful of independent power plants, located primarily in the US. Cogentrix Energy once had a net operational generating capacity of about 4,900 MW from its stakes in 27 coal- and gas-fired facilities, but sold most of these after New York-based investment firm Goldman Sachs Group acquired the company in 2007. The investment firm has Cogentrix Energy looking for new energy opportunities beyond the US power plant industry.

Comstock Resources Inc. was founded in 1919 and is based in Frisco, Texas.Comstock Resources, Inc. engages in the acquisition, exploration, development, and production of oil and natural gas in the United States. Comstock Resources Inc. has onshore operations in the east Texas, north Louisiana, and south Texas regions, as well as in Mississippi, New Mexico, Kentucky, Oklahoma, Kansas, and the Mid-Continent region. As of December 31, 2008, the company's oil and natural gas properties had proved reserves of 581.7 billion cubic feet of natural gas equivalent and owned interests in 1,693 oil and natural gas producing wells.

Contango Oil & Gas Company was founded in 1986 and is based in Houston, Texas.Contango Oil & Gas Company, together with its subsidiaries, engages in the exploration, development, production, and acquisition of oil and natural gas properties primarily offshore in the Gulf of Mexico. Contango Oil & Gas Company also holds interests in an alternative energy company. Contango Oil & Gas Company has alliance with Juneau Exploration, L.P. for assembling natural gas and oil prospects.

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