Talisman Energy, Inc., an independent international upstream oil and gas company, engages in the exploration, development, production, transportation, and marketing of crude oil, natural gas, and natural gas liquids in North America and internationally. In North America, the company conducts exploration and development operations in Alberta, British Columbia, Ontario, and Saskatchewan areas comprising Edson area, such as Bigstone/Wild River, Edson, and West Whitecourt; Greater Arch; Alberta Foot ...

Petro-Canada operates as an integrated oil and gas company in Canada. It engages in the exploration, development, production, and marketing of crude oil, natural gas liquids, and natural gas in Canada and internationally. The company also refines crude oil and other feedstock; and markets and distributes petroleum products and related goods and services. In addition, Petro-Canada involves in the production and marketing of a range of petroleum products, including gasolines, diesel oils, heating ...

Canadian Natural Resources Limited, through its subsidiaries, engages in the acquisition, exploration, development, production, marketing, and sale of crude oil, natural gas, natural gas liquids, and bitumen production. Its principal regions of crude oil and natural gas operations are the Western Canadian Sedimentary Basin, the United Kingdom sector of the North Sea, and offshore west Africa. As of December 31, 2006, the company had proved and probable reserves of 2,119 of million barrels of cru ...

EnCana Corporation engages in the exploration, production, and marketing of natural gas, crude oil, and natural gas liquids. It holds interests in various projects located in Canada and the United States; and focuses on opportunities off the east coast of Canada, as well as in Brazil, the Middle East, Greenland, and France. As of December 31, 2006, the company had net proved reserves of approximately 12.4 trillion cubic feet of natural gas and 1.1 billion barrels of crude oil, bitumen, and natur ...

Questar Corporation is a natural gas-focused energy company with four major lines of business conducted through three principal subsidiaries — Questar Market Resources (gas and oil exploration, development and production; gas gathering and processing); Questar Pipeline (interstate gas transportation and storage); and Questar Gas (retail gas distribution).

Provides electricity, natural gas, and natural gas liquids to wholesale customers in the United States and to retail customers in the state of Illinois. Owns and operates power plants, gas processing plants and electric transmission and distribution lines.

Enterprise Products Partners L.P. has grown significantly since its IPO in July 1998, increasing its asset base from $715 million to $14.4 billion at March 31, 2007. This phenomenal growth is a result of both acquisitions, as well as expansions from organic growth opportunities.