Hilcorp Energy, an oil and natural gas producer founded in 1989 by Jeffrey Hildebrand, is one of the nation's largest privately held energy companies. Hilcorp Energy Company employs the latest technology to extract oil and gas from mature fields that have been abandoned by other operators. Hilcorp Energy Company pumps about 25 million barrels of oil and natural gas equivalent annually and has proved reserves of 120 million barrels. A former Exxon Mobil geologist, Hildebrand started the company with former partner Thomas Hook.

Invenergy LLC operates about a dozen wind energy generating facilities in the US, Europe, and Canada. Invenergy LLC builds, develops, and buys energy producing properties and has about 2,000 megawatts of wind energy capacity online. While wind is the focus, Invenergy also uses natural gas to produce 2,200 megawatts of energy from facilities in the US and Canada and has plans to enter the solar energy market as well. Invenergy LLC has offices in the US, Poland, and the UK. CEO and president Michael Polsky founded Invenergy in 2001.

Oil refiner and marketer Shell Oil Products US and its sister company Motiva have the US covered. It operates refineries in the western US and markets petroleum products via Shell-branded outlets in the West and Midwest. Motiva does the same in the eastern US. Together Motiva (7,700 gas stations) and Shell Oil Products US (6,000 gas stations) form the #1 US gasoline retailing business. Motiva is a 50-50 joint venture with Saudi Aramco. Though the company has sold two of its refineries in this decade, Shell still operates four refineries throughout the country; Motiva has three of its own.

Dakota Gasification Company (Dakota Gas), owns and operates the Great Plains Synfuels Plant (Synfuels Plant). The Synfuels Plant is the only commercial-scale coal gasification plant in the United States that manufactures natural gas. Dakota Gasification Company is also the cleanest energy plant operating in the state of North Dakota, according to a comparison of emissions data available from the North Dakota Department of Health. The Great Plains Synfuels Plant harnesses the abundant coal resources underlying the North Dakota prairie. The gasification process transforms more than 6 million tons of coal into more than 54 billion cu. ft. of natural gas annually, which is then used to supply the Eastern US. In addition to natural gas, the company's Synfuels plant produces carbon dioxide, fertilizers, solvents, phenol, and other chemicals.

National Oilwell Varco, Inc. designs, constructs, manufactures, and sells systems, components, and products used in oil and gas drilling and production; provides oilfield services and supplies; and distributes products, and provides supply chain integration services to the upstream oil and gas industry worldwide. National Oilwell Varco, Inc. operates through three business segments: Rig Technology, Petroleum Services & Supplies, and Distribution Services. The Rig Technology segment offers offshore and onshore drilling rigs; derricks; pipe lifting, racking, rotating, and assembly systems; rig instrumentation systems; coiled tubing equipment and pressure pumping units; well workover rigs; wireline winches; and cranes. The Petroleum Services & Supplies segment manufactures, rents, and sells consumable goods for use in drilling operations, including drill pipe, wired drill pipe, transfer pumps, solids control systems, drilling motors, drill bits, reamers and other down hole tools, and mud pump consumables. National Oilwell Varco, Inc. primarily serves drilling contractors, shipyards and other rig fabricators, well servicing companies, pressure pumping companies, national oil companies, independent oil and gas companies, supply stores, and pipe-running service providers. National Oilwell Varco, Inc. has joint venture agreements with Schlumberger, Ltd. and Austrian based Voestalpine Group. National Oilwell Varco, Inc. was founded in 1862 and is based in Houston, Texas.

Secunda Marine Services (Secunda) owns and operates a technologically advanced fleet of offshore support vessels servicing oil and gas companies nationally and internationally. Secunda, founded in Nova Scotia, has grown its fleet to 14 vessels and one training vessel on a solid foundation of highly experienced sailors, maritime work ethic, and philosophy of providing a superior service to our customers. Secunda Marine Services Provides supplies and services for oil and gas facilities off the east coast of Canada, the North Sea, and Gulf of Mexico, Secunda International boasts such long-term customers as Exxon Mobil, Petro-Canada, Apache, and Technip. From 1998 to 2006, Secunda Marine spent about $160 million to build two vessels and convert seven. J. Ray McDermott, a unit of McDermott International acquired the company in 2007 for about $260 million.

Gastar Exploration Ltd. was founded in 1987 and is based in Houston, Texas. Gastar Exploration Ltd., an independent energy company, engages in the exploration, development, and production of natural gas and oil in the United States and Australia. Gastar Exploration Ltd. also involves in the development of coal bed methane (CBM). Gastar Exploration Ltd. owns and operates exploration and development acreage in the deep Bossier gas play of East Texas; and has exploration operations in the Marcellus Shale in West Virginia and southwestern Pennsylvania. Gastar Exploration Ltd. primary CBM properties are in the Powder River Basin in Wyoming, the United States; and in the Gunnedah Basin of New South Wales, Australia.

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.

Bonavista Energy Trust is a Calgary-based oil and gas royalty trust created through the reorganization of Bonavista Petroleum Ltd. in July 2003. The exploration and production company focuses on four core areas in Alberta, British Columbia, and Saskatchewan. In 2008 Bonavista Energy Trust reported it had about 1.2 million net acres of undeveloped land, the bulk of which is in Alberta. Bonavista also has proved reserves of 142.2 million barrels of oil equivalent and has identified some 700 quality drilling prospects. Bonavista Energy Trust has a balanced production of 52,500 barrels of oil equivalent per day -- 55% natural gas, 34% light oil, and 11% heavy oil. In 2009 Bonavista Energy Trust built up its asset base, acquiring properties in central Alberta area for about $698 million.

Iteration Energy reiterates its desire to be a top oil and gas exploration and production company. Originally a biotech company -- SYNSORB Biotech, then an oil and gas company -- Hawker Resources, the group subsequently acquired other companies exploring in the Western Canada Sedimentary Basin for natural gas and oil. As Hawker Resources it acquired fellow explorers Southward Energy and ZORIN Exploration in 2003 and 2004, respectively. In 2005 Iteration Energy Ltd. acquired Iteration Energy and took on that company's name. Following Iteration Energy's acquisition of fellow explorer Cyries Energy in 2008 the company reported proved reserves of 34.7 million barrels of oil equivalent.

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