Eden Energy is an exploration-stage oil and gas company with assets in Colorado, Nevada, and Alberta. Eden Energy Corp. primary focus is the Ant Hill Unit on the eastern flank of the White River Dome field in the Piceance Basin, Colorado. (Ant Hill is a 20,000-acre federal lease operated by EnCana Oil & Gas (USA) Inc.) Eden Energy drills wells outside EnCana's operating areas. In 2008 Eden Energy Corp. had four operating wells with proved reserves of 5.5 billion cu. ft. of natural gas equivalent. Eden Energy Corp. also has exploratory projects in the Noah and Cherry Creek projects in Nevada, and the Chinchaga project in Alberta.

EGPI Firecreek Inc., is focused on oil and gas production with an emphasis on acquiring existing oil fields with proven reserves and upside potential. EGPI Firecreek, Inc. specializes in the rehabilitation of potentially high throughput oilfields, resource properties and inventories. EGPI Firecreek has refocused on US oil and gas activities. EGPI Firecreek, Inc. produces and sells oil and natural gas from wells in Sweetwater County, Wyoming, and Knox County, Texas. EGPI Firecreek, Inc. had a strategic alliance with Sahara Group, an oil and gas concern with expertise in Eastern Europe, North Africa, Russia, Turkey, and Ukraine, but wound this down in 2008. In 2009 in a diversification move, EGPI Firecreek subsidiary Asian Ventures Corp. acquired M3 Lighting as EGPI Firecreek, Inc. expanded into light and traffic fixture manufacturing.

Ellora Energy was founded in 1995. Ellora Energy is an independent oil and gas company engaged in the acquisition, exploration, development and production of low risk onshore domestic oil and gas properties. The firm owns properties in the Haynesville Play and other assets in East Texas (including adjacent property in western Louisiana), and in Kansas (the Hugoton field). Ellora Energy Inc. has built up a land base of 910,000 gross acres with about 1,060 identified drilling locations. In 2008 Ellora Energy reported that Ellora Energy Inc. was operating 426 gross (319 net) producing wells and controlled proved reserves of approximately 194 billion cu. ft. of natural gas equivalent. Investment firm Yorktown Energy Partners owns about 64% of the company.

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.

Encore Energy Partners LP was founded in 2007 and is based in Fort Worth, Texas. Encore Energy Partners LP, together with its subsidiaries, engages in the acquisition, exploitation, and development of oil and natural gas properties. Encore Energy Partners LP has oil and natural gas properties in the Big Horn Basin in Wyoming and Montana, primarily in the Elk Basin field; the Permian Basin in West Texas; and the Williston Basin in North Dakota. As of December 31, 2008, its proved reserves included 16.6 millions stock tank barrel of oil and 56.5 billions cubic feet of natural gas. Encore Energy Partners LP also had 744 operated wells and 1,367 non-operated wells. Encore Energy Partners GP LLC serves as the general partner of Encore Energy Partners LP. Encore Energy Partners LP operates as a subsidiary of Encore Acquisition Company.

EnCore Oil plc (LSE:EO.) is a UK based oil and gas exploration and production (E&P) company quoted on AIM. EnCore Oil plc focuses on the UK Central North Sea and UK onshore regions. EnCore Oil plc also has offshore operations in Ireland, the Netherlands, and Western Sahara. The company used to explore for gold and silver but shifted its focus to acquiring interests in onshore exploration licenses. Oil Quest had started a drilling program with appraisal and exploration wells on the Isle of Wight, which EnCore Oil plc held as part of a consortium that included Northern Petroleum. In a reverse takeover in 2006, EnCore Oil plc acquired the EnCore group of companies.

Energy Corporation of America is an exploration and production independent focused on gas exploration in the Appalachian Basin, in Texas, and in New Zealand. One of the largest natural gas operators in the Appalachian Basin, ECA holds stakes in about 5,000 wells. Natural gas is the America-based energy that fuels the financial engine of Energy Corporation of America (ECA). Energy Corporation of America has proved natural gas reserves of nearly 400 billion cu. ft. equivalent. Energy Corporation of America pipeline system includes more than 50 compressor stations. Energy Corporation of America, which formed the Appalachian Gas Royalty Trust in 2005, is led by John Mork.

EnerJex was formed in 2006 by the merger of Millennium Plastics Corporation and Midwest Energy. EnerJex Resources, Inc. (EnerJex) oil and natural gas acquisition, exploration and development company. EnerJex’s principal strategy is to focus on the acquisition of oil and natural gas mineral leases that have existing production and cash flow. EnerJex Resources, Inc. works primarily in Eastern Kansas, buying producing properties that it feels are undervalued or that were abandoned by other oil companies when oil prices were below $10 a barrel. EnerJex Resources, Inc., which has proved reserves of 1.2 million barrels of oil equivalent, holds full or partial interest in half a dozen oil, gas, and oil and gas projects across Kansas. EnerJex Resources, Inc. uses enhanced drilling techniques to recover additional oil and gas from already explored fields.

Enerplus Resources Fund was founded in 1986 and is headquartered in Calgary, Canada. Enerplus Resources Fund, together with its subsidiaries, operates as an open-end investment trust. Enerplus Resources Fund owns a diversified portfolio of crude oil and natural gas producing properties in the provinces of Alberta, British Columbia, Saskatchewan, and Manitoba, western Canada; and in the states of Montana, North Dakota, Wyoming, and Utah, the United States. As of December 31, 2008, Enerplus Resources Fund had proved plus probable reserves of approximately 120,694 thousand barrels of light and medium crude oil; 45,929 thousand barrels of heavy crude oil; and 17,817 thousand barrels of natural gas liquids and 1,487,668 million cubic feet of natural gas.

Ensign Energy Services is an oil field service company in command of several service fleets. Formerly named Ensign Resource Service Group, Ensign Energy Services Inc. is one of Canada's top land-based drilling and well-service contractors and a leading drilling contractor in the US Rocky Mountain region. Ensign Energy Services Inc. operates in California and in several foreign oil patches. Ensign has a fleet of more than 300 drilling rigs, including 130 well-servicing rigs and coiled-tubing units. Ensign expanded into oil sands coring and coalbed methane markets by acquiring the drilling assets of Layne Christensen Canada in 2004 and Midnight Sun Drilling in 2005. In 2008 Ensign Energy Services Inc. had about 50 rigs in operation outside of North America.

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