Constellation Energy Group, Inc., through its subsidiaries, supplies energy products and services in North America. The company operates in three segments: Merchant Energy, Regulated Electric, and Regulated Gas. The Merchant Energy segment owns, operates, and maintains fossil, nuclear, and renewable generating facilities, and holds interests in nuclear generating facilities, qualifying facilities, and power projects. It also provides operation and maintenance services, including testing and start-up, to owners of electric generating facilities. In addition, this segment offers products and services to meet the energy requirements of wholesale and retail customers, including distribution utilities, cooperatives, aggregators, and commercial, industrial, and governmental customers. As of December 31, 2009, it had a total generation capacity of 7,118 megawatts. The Regulated Electric segment purchases, transmits, distributes, and sells electricity in central Maryland. It maintained approximately 240 substations, 1,300 circuit miles of transmission lines, and 24,500 circuit miles of distribution lines. The Regulated Gas segment purchases, transports, and sells natural gas in central Maryland. Constellation Energy Group also designs, constructs, and operates renewable energy, heating, cooling, and cogeneration facilities; offers energy performance contracting and energy efficiency engineering services; provides home improvements, service electric and gas appliances, service heating, air conditioning, plumbing, electrical, and indoor air quality systems, as well as offers natural gas marketing to residential customers in central Maryland; and develops and deploys new nuclear plants in North America through its joint venture. The company was founded in 1906 and is based in Baltimore, Maryland.

Kelda is a Norse word meaning source of water, and Yorkshire consumers count on the UK's Kelda Group as the source for water and wastewater services. The group's primary subsidiary, Yorkshire Water Services, serves some 1.7 million residential customers, representing more than 4.8 million people, and approximately 130,000 business customers. Its Loop subsidiary provides customer relationship management services for Yorkshire Water and other utilities. In addition, Kelda is engaged in real estate development through its KeyLand unit which develops or disposies of brownfield sites. In 2008 Kelda was acquired by a consortium of investment companies made up of Citigroup, GIC, Infracapital and HSBC.

Unitil Corporation company serves about 100,500 electric customers and 70,000 natural gas customers. Unitil Energy Systems provides regulated electric utility services to 72,600 customers in New Hampshire, and subsidiary Fitchburg Gas and Electric has some 27,900 power and 15,120 natural gas customers in Massachusetts. Unitil's utility units provide retail supply services to customers who don't choose to purchase energy from a third-party marketer. Indirect subsidiary, Usource LLC, provides energy brokerage service to large energy users throughout the Northeast seeking competitive power or natural gas supplies.

Companhia de Transmissao de Energia Eletrica Paulista is a true power broker. The company, known as both CTEEP and Transmissao Paulista, delivers power to the state of Sao Paulo. Its 12,140 kilometers of power lines and 100 substations transmit 30% of the electricity consumed in Brazil. Transmissao Paulista also participates in research and development projects with other utilities as well as universities and research centers. The company, which is part of Latin American power player Grupo Empresarial ISA, was formed in 1999 after the restructuring of Brazilian electric utilities that split power generation, transmission, and distribution into separate companies.

New Universe International Group supplies injection molds and plastic products primarily to global manufacturers of automotive parts and medical equipment, while its environmental businesses, owned by subsidiary New Universe Environmental Technologies, provide removal and treatment of industrial and medical waste in China. The company's plastics products are exported to customers in Europe, the Far East, and the US including Canon, Ford, Volvo, and Whirlpool. The company is controlled by CEO Xi Yu who owns parent company New Universe Enterprises.

WGL Holdings, Inc. engages in the delivery and sale of natural gas, and provides energy-related products and services in the District of Columbia, Maryland, Virginia, and Delaware. WGL Holdings, Inc. operates through three segments: Regulated Utility, Retail Energy-Marketing, and Design-Build Energy Systems. The Regulated Utility segment delivers natural gas to retail customers, as well as sells natural gas to customers who have not elected to purchase natural gas from unregulated third-party marketers. The Retail Energy-Marketing segment sells natural gas and electricity directly to residential, commercial, and industrial customers. As of September 30, 2009, it served approximately 151,000 residential, commercial, and industrial natural gas customers, and 113,000 electricity customers. The Design-Build Energy Systems segment focuses on upgrading the mechanical, electrical, water, and energy-related systems of government and commercial facilities by implementing traditional, as well as alternative energy technologies. WGL Holdings, Inc. was founded in 1848 and is headquartered in Washington, District of Columbia.

RainSoft (a division of Aquion Water Treatment Products) wants to clear up the water in your home or office. Through its division, the company makes residential and commercial water treatment equipment. Products include whole-house water conditioning systems, drinking water systems, and filters designed to remove particular contaminants that detract from water's taste and odor. RainSoft's products are distributed through a network of about 300 independent dealers in the US and in 24 countries in Asia, Europe, and the Middle East. Clients have included Allstate , Dow Chemical, Ford Motor, Holiday Inn, and Underwriters Laboratories.

domnick hunter (which does business as Parker domnick hunter) is on the chase, pursuing the ultimate path to purify, filter, and separate air, gases, and liquids. With operations in some 25 countries, the company designs and manufactures compressed air treatment products for industrial (manufacturing, transportation, and military) applications and liquid and gas filters for process (beverage, chemical, food, microelectronics, and pharmaceutical) applications.

Pennsylvania-American Water Company distributes water and provides wastewater services to a population of more than 2 million people in more than 370 communities across Pennsylvania. Pennsylvania-American Water also operates some 35 water treatment plants, seven wastewater facilities, and 9,900 miles of pipeline. The company's service territory covers some 35 Pennsylvania counties. Pennsylvania-American Water, the largest regulated water and wastewater service provider in Pennsylvania, is a subsidiary of the New Jersey-based American Water.

Dee Valley Group, operating through its Dee Valley Water unit, supplies water to more than 106,000 households and 8,250 commercial, industrial, and business customers in North East Wales and Cheshire. Dee Valley Water, formed from the combination of Wrexham Water and Chester Waterworks, supplies water to an 831-sq.-km. area. Dee Valley Water exited its nonwater operations in 2002. The company has been investing in its mains and distribution system to preventage leakage, and in 2005 it completed a 15-year water main rehabilitation program. It also commissioned a water treatment works at Pendinas. Dee Valley Group was created in 1994 as the holding company for Wrexham Water. Axa Sun Life owns 35% of the company.

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