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Quicksilver Resources Inc. was founded in 1997 and is headquartered in Fort Worth, Texas with additional offices in Cut Bank, Montana; Glen Rose, Texas; and Calgary, Canada. Quicksilver Resources Inc., an independent energy company, engages in the acquisition, exploitation, exploration, development, production, and sale of natural gas, natural gas liquids, and crude oil in North America. Quicksilver Resources Inc. also involves in marketing, processing, and transmission of natural gas. Quicksilver Resources Inc. has interests in the Barnett Shale play in the Fort Worth Basin in north Texas; and the Rocky Mountain properties located in Montana and Wyoming, as well as interests in 127,000 contiguous acres in the Horn River Basin in northeast British Columbia. Quicksilver Resources Inc. also holds interests in the Canadian CBM properties in Alberta, Canada, as well as exploring the Delaware Basin in West Texas. Quicksilver Resources Inc. sells natural gas and crude oil to various customers, including utilities, oil and natural gas companies or their affiliates, industrial companies, trading and energy marketing companies, and other users of petroleum products. As of December 31, 2008, Quicksilver Resources Inc. had total estimated total proved reserves of 2.2 trillion cubic feet equivalents of natural gas. Quicksilver Resources Inc. has a strategic alliance with Enia S.p.A. to explore properties in the Fort Worth Basin.

Range Resources Corporation was founded in 1975 and is headquartered in Fort Worth, Texas. Range Resources Corporation, an independent oil and gas company, engages in the exploration, development, and acquisition of oil and gas properties primarily in the southwestern, Appalachian, and Gulf Coast regions of the United States. Range Resources Corporation southwestern operations include the Barnett Shale of north central Texas, the Permian Basin of west Texas, and eastern New Mexico, as well as the East Texas Basin, the Texas Panhandle, and the Anadarko Basin of western Oklahoma. Its Appalachian operations include tight-gas, shale, coal bed methane, and conventional oil and gas production in Pennsylvania, Virginia, Ohio, New York, and West Virginia. Range Resources Corporation Gulf Coast operations include Texas, Louisiana, and Mississippi. Range Resources Corporation sells gas to utilities, marketing companies, and industrial users. As of December 31, 2008, Range Resources Corporation had 2.7 Tcfe of proved reserves. Range Resources Corporation also owns and operates 5,255 miles of gas gathering pipelines in Appalachia, which transport gas to transmission lines, and directly to end-users and interstate pipelines. Range Resources Corporation was formerly known as Lomak Petroleum, Inc. and changed its name to Range Resources Corporation in 1998.

Rosetta Resources Inc., an independent oil and gas company, engages in the acquisition, exploration, development, and production of oil and gas properties in North America. Rosetta Resources Inc. primarily operates in the Sacramento Basin of California; the Rockies; the Lobo and Perdido Trends in South Texas; the State Waters of Texas; and the Gulf of Mexico. As of December 31, 2008, Rosetta Resources Inc. had 398.2 billion cubic feet equivalent of proved oil and natural gas reserves, including 376.5 billion cubic feet of natural gas and 3,603 thousand barrels of oil and condensate; and drilled 184 gross wells. Rosetta Resources Inc. is headquartered in Houston, Texas.

Royale Energy, Inc. was founded in 1986 and is based in San Diego, California. Royale Energy, Inc. operates as an independent oil and natural gas producer in the United States. Royale Energy, Inc. engages in the production and sale of oil and natural gas; acquisition of oil and gas lease interests and proved reserves; drilling of exploratory and development wells; and sale of working interests in wells to be drilled. Royale Energy, Inc. also owns wells and leases located principally in the Sacramento Basin and San Joaquin Basin in California, as well as in Utah, Texas, and Louisiana. In addition, Royale Energy, Inc. holds proved developed producing reserves of oil and natural gas in Texas and Louisiana. As of December 31, 2008, Royale Energy operated 49 natural gas wells in California; owned an interest and operated 6 natural gas wells in Utah; and had non-operating interests in 17 oil and gas wells in Texas, 3 in Oklahoma, 1 in California, and 2 in Louisiana. Royale Energy, Inc. also had proved developed reserves of 3,185 MMcf and total proved reserves of 3,377 MMcf of natural gas; and proved developed oil reserves of 25 Mbbl and total proved oil reserves of 25 Mbbl.

Sempra Generation (formerly Sempra Energy Resources) pools its parent's resources into generating electricity for the competitive market. The unit, which is part of Sempra Energy 's Sempra Global division, has more than 2,600 MW of generating capacity from interests in fossil-fueled power plants. Sempra Generation operates gas-fired power plants in Arizona, California and Nevada, and in Mexicali, Mexico. In order to reduce carbon emission output to meet state and federal regulations the company is developing its first wind power and solar energy projects.

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