Mustang Fuel is independent, an independent oil and gas exploration, production, transportation and marketing company, that is. Mustang Fuel Corporation owns more than 200 properties and stakes in more than 700 other properties and controls more than 50,000 net acres of undeveloped leasehold. Mustang Fuel also owns about 4,000 miles of natural gas gathering and transporting pipeline, operates one of the largest gas processing facilities in Oklahoma and has a fleet of trucks that transports petroleum products. Mustang Fuel Corporation also markets gas. Subsidiaries include Mustang Gas Products, LLC and Mustang Fuel Marketing Company. Mustang Fuel is led by E. Carey Joullian IV, the son of the company's founder.

Emerald Energy is the oil and gas exploration and production company focuses on Colombia, where it has proved and probable reserves of 13.8 million barrels of oil equivalent. Emerald Energy was awarded a contract to drill its first well in the Campo Rico oil field in 2004, and Emerald Energy Plc has since expanded its operations in Colombia. Emerald Energy also has a 50% stake in an oilfield in Syria; Gulfsands Petroleum Syria holds the remaining 50% interest. In 2009 Chinese giant Sinochem, trying to gain further access to the South American and Middle Eastern markets, moved to buy Emerald Energy for about $875 million.

The company was founded in 1920 and is based in Tulsa, Oklahoma. Helmerich & Payne, Inc. engages in the contract drilling of oil and gas wells in the United States and internationally. Helmerich & Payne, Inc. provides drilling rigs, equipment, personnel, and camps on a contract basis to explore for and develop oil and gas from onshore areas and from fixed platforms, tension-leg platforms, and spars in offshore areas. Helmerich & Payne, Inc. conducts domestic land drilling primarily in Oklahoma, California, Texas, Wyoming, Colorado, Louisiana, Mississippi, Pennsylvania, Utah, Arkansas, New Mexico, and North Dakota; and offshore drilling in the Gulf of Mexico, offshore of California, Trinidad, and Equatorial Guinea. As of September 30, 2009, the company had 201 land drilling rigs in the United States; 9 offshore platform rigs; and international land rigs, including 1 in Venezuela, 6 in Colombia, 4 in Ecuador, 9 in Argentina, 1 in Tunisia, and 6 rigs in Mexico. In addition, Helmerich & Payne engages in the ownership, development, and operation of commercial real estate properties, as well as the research and development of rotary steerable technology.

SmartestEnergy is licensed as an electricity supplier, a natural gas supplier and a natural gas shipper. The company began trading in October 2001, primarily to enable smaller embedded generators of primarily renewable energy to gain access to the deregulated energy market in the UK. SmartestEnergy relies on its quick-wittedness to survive in the highly competitive UK energy trading sector. The company, a subsidiary of leading Japanese trading company Marubeni, primarily markets electricity in the deregulated UK market through partnerships with independent power producers, including its sister company Marubeni Europower. SmartestEnergy also trades natural gas and other energy commodities, provides market analysis and risk management services, and provides retail energy supply services to commercial and industrial customers.

Approach Resources takes a different approach to natural gas and oil exploration, development, and production. Specializing in finding and exploiting unconventional reservoirs, Approach Resources Inc. operates primarily in West Texas' Ozona Northeast field. Approach Resources Inc. also has operations in western Kentucky, and northern New Mexico. The company's unconventional designation results from a focus on developing natural gas reserves in tight gas sands and shale areas, necessitating a reliance on advanced completion, fracturing and drilling techniques. In 2008 Approach Resources reported proved reserves of 193.7 billion cu. ft. of oil equivalent, with a reserve life index of about 19 years. Yorktown Energy Partners controls the company.

The company was founded in 1997 and is based in Fort Worth, Texas.Cano Petroleum, Inc., together with its subsidiaries, operates as an independent oil and natural gas company in the United States. Cano Petroleum, Inc. properties are located onshore U.S. in Texas, New Mexico, and Oklahoma. As of June 30, 2009, it had 49.1 million barrels of oil equivalent (MMBOE) of proved reserves comprising 7.7 MMBOE of proved developed producing reserves, 2.4 MMBOE of proved developed non-producing reserves, and 39.0 MMBOE of proved undeveloped reserves. Cano secured its first round of institutional funding with a $5.1 financing from Wellington Management. In May, 2005, Cano was accepted for listing on the American Stock Exchange and in July a number of the company’s officers, directors, management and others were on hand for the ceremonial bell–ringing.

The oil refinery at Bangchak was completed in 1964. In that same year, the Thai government announced a tax on oil production within the country, so there was only one way to maintain profitability: Expand refining capacity to 20,000 barrels per day. Because the company did not attract enough investment for such expansion, the government offered a 15-year lease on the oil refinery, with the proviso that production capacity must be expanded. Finally, Summit Industrial Corporation (Panama) bid for this lease and successfully expanded production capacity over the next 4 years. A rise in worldwide crude oil prices then led to a global economic crisis. When the Thai government considered adjusting retail oil prices, there were persistent objections from labor unions and student unions, including a demand for the government to nationalize the oil refinery. When the government did so, the oil refinery was found to have deteriorated substantially, requiring large amounts of fuel and accumulating losses of about 4 billion baht.

Southwestern Energy Company was founded in 1929 and is based in Houston, Texas. Southwestern Energy Company engages in the exploration, development, and production of natural gas and crude oil in the United States. Southwestern Energy Company operates in two segments, Exploration and Production, and Midstream Services. The Exploration and Production segment involves in the development of the unconventional gas reservoir located on the Arkansas side of the Arkoma Basin, as well as exploration and production activities in Oklahoma, Texas, and Pennsylvania. This segment also engages in conventional drilling programs in the Arkansas part of the Arkoma Basin; and conducts development drilling and exploration programs in the Oklahoma portion of the Arkoma Basin, Texas and Pennsylvania, as well as operates drilling rigs in the Fayetteville Shale play and in East Texas. The Midstream Services segment engages in the marketing of its own gas production, as well as third party natural gas; and transportation of natural gas. As of December 31, 2008,Southwestern Energy Company estimated proved natural gas and oil reserves were approximately 2,185 billion cubic feet of gas equivalent.

EPCOR Utilities Inc. builds, owns and operates electrical transmission and distribution networks, water and wastewater treatment facilities and infrastructure in Canada. EPCOR is one of only 10 companies to be selected as Canada's Most Earth-Friendly Employers. EPCOR is headquartered in Edmonton, Alberta. At its core, EPCOR Utilities is an integrated energy provider. Its Energy Services division, which accounts for most of the company's sales, procures and markets electricity and natural gas for retail and wholesale customers and related products and servicess. EPCOR Utilities operates the regulated electricity and water distribution utilities in the Edmonton, Alberta, region, and it has interests in regulated and nonregulated power generation facilities in Canada and the US. The company also has energy infrastructure construction operations. The City of Edmonton owns EPCOR Utilities.

Petrofac Facilities Management Ltd., a unit of Petrofac, provides operations, maintenance, and project management services to oil and gas companies operating in the UK North Sea and in other oil patches around the world. Petrofac Facilities Management Ltd. services include oil field production enhancement, reengineering, turnkey management, and new field development. Petrofac Facilities Management also provides monitoring, operation training, and recruiting services as well as specialist maintenance diagnostic and consulting services.

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