The Crusader Energy Group was, formerly known as Westside Energy, specializes in horizontal drilling techniques and explores and develops oil and gas properties in the US. Crusader Energy Group LLC concentrates its efforts on the prolific Barnett Shale, the Anadarko Basin, and the Bakken Shale formation in the Williston Basin. Long a dormant company, Crusader Energy Group LLC was reactivated in 2004 as Westside Energy with the intention of developing oil and gas properties as well as looking for acquisitions. In 2008, that company combined with Crusader Energy Group and took on that name. In early 2010 Anadarko Basin explorer Jones Energy acquired Crusader Energy.

Heritage Oil Limited explores for, develops, and/or produces natural gas and oil from properties in the Oman, Tanzania, and Uganda. Heritage Oil Limited also has assets in Iraq, Malta, Pakistan, and Russia. Heritage Oil Limited has acquired a 95% stake in a development project in Russia. Through subsidiaries it is exploring opportunities in oil fields in Kurdistan and other areas of Iraq. In 2007 Heritage Oil reported proved plus probable reserves of 65.8 million barrels of oil equivalent. In 2007 Heritage Oil Limited announced a Production Sharing Contract with the Kurdistan Regional Government for the Miran Block in the south-west of the Kurdistan Region of Iraq.

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.

Colonial Group presides over an empire of oil and gas and shipping-related companies in the southeastern US. The group provides storage and distribution services (at more than 40 terminals) for liquid and dry bulk products including bulk chemicals, motor fuels, industrial fuel oil, and retail gas. It also provides ship bunkering, commercial shipping, and tug and barge services. Colonial Group also operates more than 70 gas stations and convenience stores in Georgia, North Carolina, and South Carolina through its Enmark Stations unit. In addition, subsidiary Georgia Kaolin Terminals provides storage facilities for customers in the US kaolin industry.

J. Ray McDermott is a leading worldwide marine solutions company with fabrication facilities in the Americas, Middle East, Caspian and Asia Pacific. J. Ray McDermott (JRM) is ocean-deep in projects to design, fabricate, and install platforms, vessels and pipelines for offshore oil and gas production. A subsidiary of engineering group McDermott International, the marine construction company offers project management, engineering, and subsea trenching services. JRM operates a diversified fleet of vessels used for derrick work, pipelaying, and pipe burying. J. Ray McDermott, S.A. primary areas of operation include the Gulf of Mexico, the Asia/Pacific region, the Middle East, and the Caspian Sea.

Penn West Energy Trust was founded in 1979 and is headquartered in Calgary, Canada. Penn West Energy Trust (formerly Penn West Petroleum) has been pumping gas and oil from Western Canada in hopes of keeping black ink flowing from its auditor's pen. The independent exploration and production company has holdings of 3.2 million net acres of undeveloped land in Alberta, Saskatchewan, and British Columbia. In 2007 Penn West Energy Trust reported net proved and probable reserves of 644.2 million barrels of oil equivalent. Shareholders converted Penn West Energy Trust into a trust in 2005, making it one of Canada's largest oil and gas income trusts. It combined general partners Penn West, Northern Reef, Trocana, and Penn West Exploration.

Sonatrach seeks to stay on track as one of the world's top energy players. State-owned Sonatrach oversees Algeria's oil and gas exploration, production, and marketing activities. In addition to its exploration, refining, and pipeline operations, the company also invests in electrical power and in desalination projects. The company also has exploration and production activities in other countries, including Libya, Mali, Niger, and Peru. Sonatrach has proved reserves globally of 225 million tons of oil equivalent, and operates a gas station network of more than 1,950 outlets.

Oil & Gas Development Company Limited (or OGDCL) is Pakistan's largest oil and gas exploration and production company. OGDCL's products include gas, crude oil, and LPG. Oil and Gas Development Company exploration activities are performed both on its own and through joint ventures, some of which the company operates; OGDCL explores both within and outside of Pakistan, as well as offshore. Oil and Gas Development Company accounts for 45% of Pakistan's oil reserves and 35% of the country's natural gas reserves. Total proved reserves in 2009 stood at 625 million barrels of oil equivalent. OGDCL was founded by Pakistan's government in 1961. In 2009 the government owned 85% of the company.

Fred. Olsen Energy has its hold on drilling in the North Sea and in several other oil plays. Through its subsidiaries, Fred. Olsen Energy ASA provides offshore oil and gas drilling services. Through its Dolphin subsidiary, Fred. Olsen operates a fleet of nine semi-submersible rigs and one deepwater drillship used to support offshore drilling activities. Fred. Olsen also provides shipbuilding services through its Harland and Wolff subsidiary. Customers of the group have included Exxon Mobil, Kerr-McGee, Statoil, and Vaalco. Both Bonheur and Ganger Rolf hold about 27% of the company. Fred. Olsen Energy ASA focuses on rewarding long term customer relationships where innovative and integrated solutions are presented to the benefit of customers, shareholders and employees.

E.ON UK (formerly Powergen) hasn't been a UK energy provider for eons, but long enough to become one of the top power suppliers and producers in the nation. A subsidiary of German utility E.ON, the company is vertically integrated with operations in electricity generation, trading, supply, and distribution. E.ON UK supplies electricity and natural gas to 8 million nonregulated retail customers. Its Central Networks unit operates a distribution network serving 4.9 million power customers. E.ON UK has regulated power utility assets, operates conventional and renewable energy-based power plants, and trades wholesale electricity, gas, and other commodities.

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