Integrys Energy Group, Inc., through its subsidiaries, operates as a regulated electric and natural gas utility company in the United States and Canada. It provides natural gas utility services in Chicago, Wisconsin, Michigan, and Minnesota. As of December 31, 2009, Integrys Energy Group, Inc. served approximately 1,669,000 residential, commercial and industrial, transportation, and other customers. It had approximately 22,000 miles of natural gas distribution mains; and approximately 1,010 miles of natural gas transmission mains. The company also generates and distributes electric energy form coal, natural gas, fuel oil, hydroelectric, and wind resources in Wisconsin and Michigan. It served approximately 489,000 residential, commercial and industrial, wholesale, and other customers. In addition, Integrys Energy offers nonregulated energy supply and services; and electric transmission services. Integrys Energy Group, Inc. was formerly known as WPS Resources Corporation and changed its name to Integrys Energy Group, Inc. in February 2007. Integrys Energy Group, Inc. was founded in 1883 and is based in Chicago, Illinois.

This Springfield is not Homer Simpson's hometown, or Abe Lincoln's. City Utilities of Springfield, Missouri supplies electricity, natural gas, and water for residents and businesses in the southwestern Missouri town. The utility, which has about 1,970 miles of power lines and 1,300 miles of natural gas mains, serves about 106,560 electric customers, more than 82,220 natural gas customers, and more than 76,600 water customers. It also operates the municipal bus system, which has 25 regular street buses and five demand/response buses. City Utilities of Springfield has a service region of 320 sq. ml. and serves a base population of 229,000.

Southern Water Services provides water to about 1 million households in South East England. In addition, Southern Water provides wastewater services to about 2 million households. The company has 90 water treatment works, 150 water supply booster stations, and another 370 wastewater treatment works. It maintains a network of some 13,600 km of water mains. The utility also recycles sewerage sludge for use in agriculture. Its area of operation includes Kent, Sussex, Hampshire, and the Isle of Wight. Southern Water is owned by Greensands Investments Limited, which is owned by infrastructure investors and pension funds.

SEMCO ENERGY is owned by energy investment firm Continental Energy Systems through its Cap Rock Holding unit. Alaska and Michigan have more in common than a cold climate. SEMCO ENERGY serves approximately 410,000 natural gas consumers in both states. The company's main subsidiary is utility SEMCO ENERGY Gas, which distributes gas to about 280,000 customers in 24 Michigan counties. SEMCO's ENSTAR Natural Gas unit distributes gas to about 130,000 customers in and around Anchorage, Alaska. The company's unregulated operations include propane distribution in Michigan and Wisconsin; pipeline and storage facility operation; and information technology outsourcing.

Founded in 2001 by partners David Hernandez, Eliezer Hernandez and Alberto Daire, Liberty Power has grown to serve tens of thousands of customers including small and mid–sized businesses, large Fortune 500 accounts, and government entities on a national level.

AES is one of the world's leading independent power producers. The company has interests in more than 120 generation facilities in about 30 countries throughout the Americas, Asia, Africa, Europe, and the Middle East that give it a combined net generating capacity of 40,300 MW. AES sells electricity to utilities and other energy marketers through wholesale contracts or on the spot market. AES also sells power directly to customers worldwide through its interests in distribution utilities, mainly in Latin America. In 2009 the company had 1,900 MW of power plants under development in four countries.

American Electric Power Company, Inc. engages in the generation, transmission, and distribution of electric power. It generates electricity using coal and lignite, natural gas, nuclear, and hydroelectric energy. The company distributes electric power at wholesale to other electric utility companies, rural electric co-operatives, municipalities, and other market participants, as well as to retail customers in its service areas. It also operates nonregulated wind farms and barging operations, as well as provides various energy-related services. The company operates in the states of Arkansas, Indiana, Kentucky, Louisiana, Michigan, Ohio, Oklahoma, Tennessee, Texas, Virginia, and West Virginia. As of December 31, 2008, it owned or leased approximately 37,000 megawatts of power generation capacity. The company was founded in 1906 and is based in Columbus, Ohio.

Trans-Elect has elected itself as a cross-border power company. The independent transmission company owns and operates about 12,600 miles of high-voltage power lines in portions of Canada and the US. The company acts as a wholesale provider of electricity to distribution companies. It operates the former transmission assets of of US utility Consumers Energy; it is also part of an international consortium that operates the former transmission assets of Canadian power distributor TransAlta. The acquisitions were the first of their kind in the deregulating North American electricity market. Trans-Elect is also involved in several expansion projects in congested areas of the US grid.

Platte River Power Authority supplies wholesale electricity to four municipalities (Estes Park, Fort Collins, Longmont, and Loveland) in northern Colorado, which in turn serve more than 140,500 residences and businesses. The utility, which is a political subdivision of the state of Colorado, has interests in fossil-fueled and wind-powered generation facilities; it also operates transmission assets and acts as a wholesale electric utility, acquiring, constructing and operating generation capacity and supplying electric energy on an as needed basis. Platte River Power Authority evolved from the Platte River Municipal Power Association, a consortium of 31 municipalities.

Bluebonnet Electric Cooperative's mission is similar to the late Lady Bird Johnson's quest to spread wildflower seeds along Texas' highways -- the cooperative spreads currents of electricity among rural central Texas dwellers. One of the largest power distribution cooperatives in the state, Bluebonnet Electric serves almost 80,000 customers in 14 counties. The member-owned company, which was formed in 1939, operates approximately 11,000 miles of transmission and distribution lines, and 19 substations. It purchases its wholesale power supply at 21 Lower Colorado River Authority-owned substations.

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