Abraxas Petroleum Corporation company was founded in 1977 and is based in San Antonio, Texas. Abraxas Petroleum Corporation (Abraxas) is an independent energy company primarily engaged in the development and production of natural gas and crude oil. At December 31, 2008, the Company’s properties are located in the Rocky Mountain, Mid-Continent, Permian Basin and Gulf Coast regions of the United States. On January 31, 2008, Abraxas Operating , LLC, a wholly owned subsidiary of the Partnership, consummated the acquisition of certain oil and gas properties located in various states from St. Mary Land & Exploration Company (St. Mary) and certain other sellers. In October 2009, Abraxas Petroleum Corporation closed the merger with Abraxas Energy Partners, L.P.

Allegheny Energy is a utility holding company that has both regulated and unregulated operations.Allegheny Energy Supply Company own approximately 9,730 megawatts (MW) of generating capacity. Approximately 95% of their power output comes from coal. Allegheny Energy Supply Company burn nearly 19 million tons of coal annually.Allegheny Energy Supply Company regulated utilities, doing business as Allegheny Power, are West Penn Power Company (Pennsylvania); Monongahela Power Company (West Virginia); and The Potomac Edison Company (Maryland, Virginia, and West Virginia).Allegheny Energy stock (symbol: AYE) is listed on the New York Stock Exchange.

Altek Power hopes it has all the technology it needs to become a top player in the global electricity market. The independent power producer is a manufacturer of distributed generation plants. Altek Power Corporation operates a generation facility in Alberta that is fueled with solution gas (a waste product of the petroleum industry). Altek Power also sells distributed generation equipment, including waste gas-fired turbine generators and biomass (organic waste) energy systems. Altek Power Corporation provides engineering and construction services for power plants and other heavy industrial facilities.

American Oil & Gas, Inc. was founded in 2000 and is based in Denver, Colorado.American Oil & Gas, Inc., an independent energy company, engages in the acquisition, exploration, and development of crude oil and natural gas in the western United States.American Oil & Gas Inc. controls approximately 53,000 gross acres in the Fetter Project area, located in the southern Powder River Basin, Wyoming; approximately 128,000 gross acres in the Krejci Project, located in Niobrara County, Wyoming; approximately 87,000 gross acres in the Goliath Project, located in the Williston Basin, North Dakota; and approximately 175,000 gross acres in the Bigfoot Project, located in the U.S. Rocky Mountain area. American Oil & Gas Inc., through its subsidiary, Tower American Corporation, also involves in oil and gas exploration and production operations in Colorado.

Americas Power Partners focuses on cogeneration technologies as it develops small-scale independent power plants (generating less than 100 MW of power) in the US and sells electricity to utilities, marketers, and industrial and commercial users. Americas Power Partners company also provides on-site distributed generation and optimization services (whereby it improves plant operations but leaves ownership in the hands of the client). In addition, Americas Power Partners improves some plant's utility and distribution systems while taking ownership and operation of the plant. Armstrong Service is the company's major strategic partner.

Anadarko Petroleum has ventured beyond its original area of operation -- the Anadarko Basin -- to explore for, develop, produce, and market oil, natural gas, natural gas liquids, and related products worldwide. The large independent company has proved reserves of 1 billion barrels of crude oil and 8 trillion cu. ft. of natural gas, more than 70% of which are located in the Continental US. Other activities include coal, trona, and mineral mining. Anadarko operates seven gas-gathering systems in the mid-continent. Internationally, Anadarko Petroleum Corporation has substantial oil and gas interests in Algeria's Sahara Desert, Venezuela, and western Canada.

Apache Corporation was founded in 1954 and is based in Houston, Texas.Apache Corporation, together with its subsidiaries, engages in the exploration, development, and production of natural gas, crude oil, and natural gas liquids. Apache Corporation has exploration and production interests in the Gulf of Mexico, the Gulf Coast, east Texas, the Permian basin, the Anadarko basin, and the Western Sedimentary basin of Canada; and onshore Egypt, offshore Western Australia, offshore the United Kingdom in the North Sea, and onshore Argentina, as well as on the Chilean side of the island of Tierra del Fuego. Apache Corporation sells its natural gas to local distribution companies, utilities, end-users, integrated oil and gas companies, and marketers; and crude oil to integrated oil companies, purchasers, transporters, and refiners. As of December 31, 2008, it had total estimated proved reserves of 1,081 million barrels of crude oil, condensate, and natural gas liquids, as well as 7.9 trillion cubic feet of natural gas.

Apco Oil & Gas International Inc.was founded in 1970 and is headquartered in Tulsa, Oklahoma.Apco Oil & Gas International Inc. engages in the exploration and production of oil and gas properties. Apco Oil & Gas International Inc. owns interests in seven oil and gas concessions and one exploration permit in Argentina. The company primarily holds a 52.79% interest in the exploration, production, and development of oil and gas in the Entre Lomas concession located in the provinces of Rio Negro and Neuquen in southwest Argentina. Apco Oil & Gas International Inc. was formerly known as Apco Argentina Inc. and changed its name to Apco Oil & Gas International Inc. on July 16, 2009. Apco Oil & Gas International Inc. is a subsidiary of Williams Companies, Inc.

Aspen Exploration Corporation was founded in 1979 and is based in Denver, Colorado.Aspen Exploration Corporation does not have significant operations. Aspen Exploration Corporation intends to seek possible business combinations with third parties. Prior to June 30, 2009, Aspen Exploration Corporation engaged in the acquisition, exploration, and development of oil and gas properties in California and Montana, the United States.

ATP Oil & Gas Corporation was founded in 1991 and is based in Houston, Texas.ATP Oil & Gas Corporation engages in the acquisition, development, and production of oil and natural gas properties in the Gulf of Mexico, the United Kingdom, and Dutch Sectors of the North Sea. As of December 31, 2008, ATP Oil & Gas Corporation had leasehold and other interests in 77 offshore blocks, 41 platforms, and 129 wells, including 22 subsea wells in the Gulf of Mexico; and interests in 10 blocks and 3 company-operated subsea wells in the North Sea. ATP Oil & Gas Corporation had estimated net proved reserves of 713.6 billion cubic feet equivalent, of which approximately 449.6 billion cubic feet equivalent were in the Gulf of Mexico and 264.0 billion cubic feet equivalent were in the North Sea. These reserves were comprised 321.7 billion cubic feet of natural gas and 65.3 million barrels of crude oil.

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