DTE Energy Company, together with its subsidiaries, operates as an electric and natural gas utility company in Michigan. It also involves in non-utility operations. The company’s Energy Utility segment engages in the generation, purchase, distribution, and sale of electricity in southeastern Michigan. It generates electricity from various fuels, including coal, as well as from nuclear and hydro facilitates. As of December 31, 2009, this segment owned and operated approximately 677 distribution substations and approximately 423,600 line transformers; and supplied electricity to 2.1 million residential, commercial, and industrial customers in southeastern Michigan. The company’s Gas Utility segment engages in the purchase, storage, transmission, distribution, and sale of natural gas in Michigan. As of December 31, 2009, this segment’s distribution system included approximately 19,000 miles of distribution mains, 1,177,000 service lines, and 1,312,000 active meters. It also owned approximately 2,100 miles of transmission lines that deliver natural gas; and supplied natural gas to approximately 1.2 million residential, commercial, and industrial customers throughout Michigan, as well as to approximately 17,000 customers in Adrian, Michigan. The company’s non-utility operations include natural gas pipelines and storage; unconventional gas exploration, development, and production; power and industrial projects, and coal transportation and marketing; and energy marketing and trading operations. Its customers include electric utilities, merchant power producers, integrated steel mills, and industrial companies. DTE Energy Company was founded in 1995 and is based in Detroit, Michigan.

Piedmont Municipal Power Agency (Piedmont Power) generates, purchases, and transmits wholesale electricity on behalf of its 10 member municipal utilities, which distribute the power to nearly 95,000 retail customers in northwestern South Carolina. These ten utilities serve the cities of Abbeville, Clinton, Easley, Gaffney, Greer, Laurens, Newberry, Rock Hill, Union, and Westminster. Piedmont Power was created to buy an ownership interest in the Catawba Nuclear Station in York County, South Carolina, in order to secure a reliable source of electric generation for its member utilities.The agency currently owns a 25% stake in the Catawba plant.

Tokyo Electric Power Company (TEPCO), which supplies power to a population of 44 million customers in Tokyo, Yokohama, and the rest of the Kanto region. One of the world's largest electric utilities, TEPCO's 190 power plants have the generating capacity of approximately 64,000 MW, primarily produced by thermal, nuclear, and hydroelectric power sources. Through interests in telecom businesses, the company offers telephony and Internet services; it also has international consulting and power generation operations. Other businesses include construction, real estate, and transportation companies. It also invests in independent power producers in other countries.

Dominion Resources, Inc., together with its subsidiaries, engages in producing and transporting energy in the United States. It operates in three segments: DVP, Dominion Generation, and Dominion Energy. The DVP segment includes regulated electric transmission and distribution operations that serve residential, commercial, industrial, and governmental customers in Virginia and northeastern North Carolina. This segment also involves in non regulated retail energy marketing of electricity and natural gas. The Dominion Generation segment includes the electricity generation through coal, nuclear, gas, oil, and renewables; and related energy supply operations. It also comprises generation operations of the company’s merchant fleet and energy marketing, and price risk management activities for these assets. The Dominion Energy segment includes the company’s Ohio and West Virginia regulated natural gas distribution companies, regulated gas transmission pipeline and storage operations, natural gas gathering and by-products extraction activities, regulated LNG import and storage, and Appalachian exploration and production operations. It also provides producer services, which aggregates natural gas supply; engages in natural gas trading and marketing activities; and involves in natural gas supply management. The company’s portfolio of assets includes approximately 27,500 MW of generation; 6,000 miles of electric transmission lines; 56,000 miles of electric distribution lines; 12,000 miles of natural gas transmission, gathering, and storage pipeline; and 21,700 miles of gas distribution pipeline. Dominion Resources, Inc. also owns approximately 942 bcf of storage capacity of natural gas and serves retail energy customers in 12 states. In addition, it sells electricity at wholesale prices to rural electric cooperatives, municipalities, and into wholesale electricity markets. The company was founded in 1909 and is headquartered in Richmond, Virginia.

Renegy Holdings (formerly Catalytica Energy Systems) was formed in the 2007 merger of Catalytica with the renewable energy divisions of NZ Legacy, a land and energy development firm. Among other ventures, Renegy has built a biomass power generation plant near Snowflake, Arizona, that came online in 2008. The company has long-term power purchasing agreements in place with Arizona Public Service and Salt River Project to buy biomass electricity from the Snowflake White Mountain Power plant. To save costs, in 2009 Renegy delisted its stock from the NASDAQ exchange.

American Transmission Company is an entrepreneur in the US power grid business. Connecting electricity producers to distributors, American Transmission owns, operates, monitors, and maintains 9,400 miles of high-voltage electric transmission lines and 510 substations in portions of Illinois, Michigan, Minnesota, and Wisconsin. American Transmission is one of the first for-profit transmission companies, formed when the US market deregulated in the early 2000s. The company operates the former transmission assets of some of its shareholders. About 30 utilities, municipalities, municipal electric companies, and electric cooperatives in its service area have an ownership stake in American Transmission.

United Utilities Group PLC, through its subsidiaries, engages in the ownership, operation, and maintenance of water and wastewater networks in the United Kingdom and internationally. It supplies water covering a population of approximately 7 million people, and 2.9 million households and business premises; and involves in the collection and treatment of wastewater through a network of 43,419 kilometers of sewers. The company also operates electricity distribution network, and high voltage networks for businesses; and gas distribution network, as well as pipes and the equipment used to pump, condition, and store gas. In addition, United Utilities Group PLC provides consulting services and project management services; property management services; multi-utility metering operations and metering installation services; technical and management services; and asset management services. The company was formerly known as United Utilities Newco Limited and changed its name to United Utilities Group PLC in April 2008. United Utilities Group PLC was founded in 1989 and is headquartered in Warrington, the United Kingdom.

TransCanada Corporation operates as an energy infrastructure company in North America. The company operates in two segments, Pipelines and Energy. The Pipelines segment develops and operates energy infrastructure, including natural gas pipelines, regulated gas storage facilities, and projects related to oil pipelines. As of December 31, 2009, its pipelines network extended approximately 60,000 kilometers tapping into various gas supply basins in North America. The Energy segment engages in the acquisition, development, construction, ownership, and operation of electrical power generation plants; the purchase and marketing of electricity; the provision of electricity account services to energy and industrial customers; and the development, construction, ownership, and operation of non-regulated natural gas storage in Alberta. As of December 31, 2009, its power generation plants had 11,700 megawatts of power generation capacity. TransCanada Corporation was founded in 1951 and is headquartered in Calgary, Canada.

Pepco Holdings has more power than any politician in the populace of the US capital. The holding company distributes electricity and natural gas through its Potomac Electric Power (Pepco), Delmarva Power & Light, and Atlantic City Electric utilities to about 1.9 million customers in Delaware, Maryland, New Jersey, and Washington, DC. Nonregulated operations include independent power production, wholesale and retail energy marketing, and energy management services, through the company's Pepco Energy Services units.

North Carolina Electric Membership Corporation (NCEMC) generates and transmits electricity to the state's 26 electric cooperatives in 93 of North Carolina's 100 counties. The co-op owns more than 600 MW of generating capacity through four primarily natural gas peak load generators, plus a 62% stake in Catawba Nuclear Station Unit 1, and a 31% stake in the common facilities of the Catawba Nuclear Station in South Carolina. It also buys power from Progress Energy, American Electric Power, and other for-profit utilities. NCEMC's member cooperatives serve more than 950,000 businesses and homes in North Carolina. The wholesale co-op also operates an energy operations center.

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