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.

Centrais Eletricas Brasileiras S.A. – Eletrobras primarily engages in the generation, distribution, transmission, and commercialization of electric power; and construction and operation of nuclear power plants in Brazil. The company also assists Brazil's Ministry of Mining and Energy in designing the country's policy for the energy sector; provides guarantees and acquires debentures of companies and holders of public electric power services; grants loans and guarantees for technical and scientific research institutions; promotes and supports research in the power sector in connection with the generation, transmission, and distribution of electric power, as well as studies involving the exploitation of watershed for various purposes; contributes to the education of technical staff and qualified workers required by the Brazilian electric power sector through specialized training programs or assists national educational institutions or provides scholarships or signs agreements with foreign institutions that promote the development of specialized technical personnel; and co- operates technically and administratively with companies in which it holds interests, and with the agency of the Ministry of Mining and Energy. In addition, it manages incentive program for alternative sources of electric power, a program of the federal government that aims to enhance the diversification of the Brazilian energy model and search for regional solutions based on renewable electric power sources produced by independent agents. The company is headquartered in Rio de Janeiro, Brazil.

The main tenet of TenneT's business is to keep the Dutch national power transmission grid running smoothly across the nation's high-voltage power lines, constantly balancing supply with demand. The state-owned company also provides inspection and maintenance services for the infrastructure. TenneT manages more than 2,040 miles of high-voltage transmission lines and more than 50 electrical substations. Subsidiary APX manages non-contracted wholesale energy transactions. In 2010 TenneT spent $1.1 billion to buy grid operator transpower from E.ON. In 2010 a TenneT and National Grid joint venture began laying the first section of a high-voltage cable to connect the power grids in the Netherlands and the UK.

Energen Corporation, an energy holding company, engages in the acquisition, exploration, development, and production of oil, natural gas, and natural gas liquids in the continental United States. It also involves in the purchase, distribution, and sale of natural gas to residential, commercial, and industrial customers, as well as other end-users of natural gas in central and north Alabama. In addition, the company provides gas transportation services for industrial and commercial customers located on its distribution system. As of December 31, 2009, Energen Corporation had proved oil and gas reserves of 1,547 billion cubic feet equivalent in the San Juan Basin in New Mexico and Colorado, the Permian Basin in west Texas, and the Black Warrior Basin in Alabama. Energen Corporation was founded in 1929 and is headquartered in Birmingham, Alabama.

Wheelabrator Technologies is on a roll. A subsidiary of solid-waste processing giant Waste Management, the company operates municipal-waste incinerators and trash-to-steam plants that convert 7 million tons of municipal solid waste annually into energy. Wheelabrator operates 16 waste-to-energy plants that burn solid waste to produce high-pressure steam; that steam turns turbines, generating more than 800 MW of electricity -- enough to power more than 900,000 homes. It also has five independent power producers (IPPs) that combust a combination of trash, waste wood, tires, coal, and gas to generate another 200 MW of electricity. Wheelabrator operates in the northeastern US, California, Florida, and Washington.

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.

These electric cooperatives serve more than 750,000 residents, businesses, industries and farms in a 15,000 sq. ml. service area. It operates four electric power plants and a 1,450-mile trasmission system, and maintains the Tuttle Creek Reservoir in Southwest Indiana. Hoosier Energy is part of the Touchstone Energy network of electric cooperatives.Who's yer daddy? In terms of providing electricity, for many Indianans (and some residents of Illinois) that would be Hoosier Energy Rural Electric Cooperative, which provides wholesale electric power to 18 member distribution cooperatives in 48 central and southern Indiana counties, and 11 counties in southeastern Illinois.

Shikoku Electric Power, like the island it serves, is making bridges to new areas. One of 10 regional electric utilities licensed by the Japanese government to generate, transmit, and distribute power, Shikoku (known as Yonden in Japan) provides electricity to more than 4 million people in the four prefectures of Shikoku. The company has a generating capacity of more than 6,660 MW, primarily from nuclear and fossil-fueled plants; however, Shikoku is converting some of its oil-fueled plants to liquefied natural gas. Shikoku has expanded beyond its power utility business into activities such as Internet access, cable TV, remote monitoring and control systems, and rest homes for the elderly.

Atmos Energy Corporation, together with its subsidiaries, engages primarily in the distribution, transmission, and storage of natural gas in the United States. The company operates in four segments: Natural Gas Distribution; Regulated Transmission and Storage; Natural Gas Marketing; and Pipeline, Storage, and Other. The Natural Gas Distribution segment involves in regulated natural gas distribution business and related sales operations. It distributes natural gas through regulated sales and transportation arrangements to approximately 3 million residential, commercial, public authority, and industrial customers in 12 states located primarily in the southern United States. As of September 30, 2009, this segment owned approximately 70,879 miles of underground distribution and transmission mains. The Regulated Transmission and Storage segment transports natural gas for third parties and manages five underground storage reservoirs in Texas. It owned 5,950 miles of gas transmission and gathering lines. The Natural Gas Marketing segment provides various natural gas management and marketing services to municipalities, other local gas distribution companies, and industrial customers. The Pipeline, Storage, and Other segment offers natural gas gathering, transmission, and storage services. It owned 113 miles of gas transmission and gathering lines. Atmos Energy Corporation was founded in 1906 and is headquartered in Dallas, Texas.

Catalytic Combustion Corporation clears the air -- literally and alliteratively. The company makes systems, processes, and products to help customers eliminate volatile organic compounds (VOCs) and other pollutants in order to meet air-quality standards. Catalytic Combustion's catalysts -- substances that accelerate the rate of chemical reactions -- are used in a host of industries and products, ranging from appliances to graphic arts to nuclear power plants. The company makes catalysts from materials such as ceramics, metal foil, and wire mesh. Catalytic Combustion was founded in 1950.

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