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.

Clean water is the goal of H2O Innovation. For amusement parks, campgrounds, cities, schools, zoos, and other enterprises, H2O Innovation uses micro filtration, ultra filtration, nanofiltration, and reverse osmosis to create drinking water, as well as clean water for manufacturing and other purposes. H2O Innovations also treats wastewater, offers equipment for the maple syrup industry, and desalinates seawater and brackish water. In 2007 it became the first North American company to be listed on the Alternext (Euronext) Exchange in Paris. By 2008 the company had installed more than 400 systems in Canada, the US, and elsewhere.

Viridian Group, through its main subsidiary, regulated regional electric company Northern Ireland Electricity (NIE), transmits and distributes power to about 793,000 homes and businesses in Northern Ireland. Its NIE Energy Supply unit is the regulated electricity supplier in Northern Ireland. Viridian is also involved in unregulated businesses, including retail power and natural gas marketing (Energia) and high-voltage electrical infrastructure contracting (Powerteam). It also participates in Ireland's electricity market through its Energia subsidiary, which deals in both retail and wholesale energy. In 2010 Irish power utility ESB Group acquired NIE from Viridian for $1 billion.

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.

BlueStar Energy intends to burn bright in the firmament of independent electricity providers. Serving customers in the deregulated markets of Maryland, Illinois, Pennsylvania, and Washington, DC, the company offers variable- and fixed-rate and custom plans along with green energy to industrial, commercial, and residential customers. Its energy efficiency program examines customers' energy usage and offers services to decrease costs including reworking interior and exterior lighting, monitoring power use, rewiring fixtures, and performing exterior maintenance. BlueStar Energy spreads it power from offices in Chicago and Peoria, Illinois.

Toronto Hydro provides electric and related services for the metropolitan area and other parts of Ontario. The company's primary subsidiary, Toronto Hydro-Electric System Limited (LDC), provides regulated power transmission and distribution services to 688,000 residential, commercial, and industrial customers. Subsidiary Toronto Hydro Energy Services markets power and provides energy efficiency products and services throughout Ontario. It also provides street lighting services (160,000 street lights) in the City of Toronto.

Severn Trent Services is intent on providing cleaner water for consumers around the globe. The company, a subsidiary of UK-based Severn Trent, provides water and wastewater purification services and products to utilities, bottling companies, and other clients, primarily in the US and the UK. Operations include water filtration and disinfection technologies, contract operations and maintenance, pipeline rehabilitation, and state-of-the-art residential metering products and services. Severn Trent Services' international management services unit supports all aspects of water and wastewater utility management.

Deriving its name from an old Eskimo tribal word, Chugach Electric Association generates, transmits, distributes, and sells electricity in Alaska's railbelt region. This area extends from the coastal Chugach Mountains into central Alaska and includes the state's two largest cities (Anchorage and Fairbanks). The member-owned cooperative utility has 530 MW of generating capacity from its natural gas-fired and hydroelectric power plants. Serving 80,300 metered retail locations, Chugach Electric, the largest electric utility in Alaska, also sells wholesale power to other municipal and cooperative utilities in the region.

Vermont Gas Systems was established in 1965 to supply natural gas to 6,400 customers in Chittenden and Franklin Counties. Over the years, residents and businesses in these communities have recognized natural gas to be a clean, efficient and abundant form of energy. Over 40,000 customers now recognize Vermont Gas’ commitment to providing safe, economical service. The Vermont Gas story begins in the abundant natural gas fields of Alberta, Canada. Our natural gas is transported across Canada via the TransCanada PipeLine and enters Vermont Gas Systems’ main pipeline at Highgate, on the Vermont/Canada border. Our customers are served through a network of more than 650 miles of underground transmission and distribution lines.

Sutton and East Surrey Water supplies water in southern England. The regulated utility distributes water to about 252,000 residential customers and some 18,000 businesses, (a population about 650,000 people), in the London boroughs of Croydon, Merton, and Sutton, as well as East Surrey and parts of Kent and Sussex. Formerly a subsidiary of East Surrey Holdings, the company was acquired by private equity firm Terra Firma Capital Partners in 2005 when Terra Firma was required to buy the parent company in order to obtain gas company Phoenix Natural Gas. Terra Firma quickly sold the water utility to a fund of Germany's Deutsche Bank.

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