Northeast Utilities (NU) uses a little Yankee ingenuity (and a number of power generation plants) to keep its customers powered up. The largest utility in New England, NU supplies power to more than 2 million customers in Connecticut, New Hampshire, and Massachusetts through subsidiaries Connecticut Light and Power, Public Service Company of New Hampshire, and Western Massachusetts Electric. The company's power grid encompasses more than 3,100 circuit miles of overhead transmission lines and more than 32,800 pole miles of distribution lines. NU's Yankee Gas utility provides natural gas to 205,000 customers in Connecticut. In 2010 the company offered to buy regional rival NSTAR in for $4.2 billion.

Denali Incorporated company specializes in fiberglass-reinforced composite products used to handle hazardous or valuable fluids. The company's Containment Solutions (CSI) unit makes underground fiberglass storage tanks for the petroleum and water and wastewater industries and above-ground steel storage tanks for the petroleum and automotive industries. Denali's Fabricated Plastics unit makes makes thermoplastic assemblies for corrosion applications, such as in tanks, piping, and ductwork.

Mesa Power Group, it takes an oil tycoon from Texas to raise the profile of wind energy in North America. Controlled by veteran oilman and renewable energy proponent T. Boone Pickens, who gained national attention with the Pickens Plan, a campaign aimed at reducing US dependence on foreign oil, the company is engaged in developing and investing in wind power projects. It acquires these projects and completes development on them through a joint venture with GE called the American Wind Alliance (AWA). It typically targets projects in Canada and the US that have secured land control, access to transmission lines, and minimum capacity of 100 megawatts.

United Water International, founded in 1995, is one of the largest water utility companies operating in towns and cities in both Australia and New Zealand (including major centers such as Adelaide, Ballarat, and Auckland). United Water International operates and maintains water and wastewater treatment plants as well as customer call centers. All told, the company serves somewhere in the neighborhood of 1.5 million customers. United Water International is owned by Halliburton unit KBR, and Veolia Environnement.

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.

Marietta Board of Lights and Water (doing business as Marietta Power and Water) to provide electricity and water to residents and businesses in the city of Marietta, and the counties of Marietta and Cobb. The municipal utility operates through two divisions: Marietta Power distributes electricity to more than 45,000 customers and purchases power from the Municipal Electric Authority of Georgia (MEAG Power), and Marietta Water provides water supply and wastewater collection services to more than 17,000 customers.

Xcel Energy has accelerated its energy engine into utility markets across the US. The utility holding company distributes electricity to 3.4 million customers and natural gas to 1.9 million in eight states; Colorado and Minnesota account for the majority of its customers. Its regulated utilities -- Northern States Power, Public Service Company of Colorado, and Southwestern Public Service -- have more than 20,500 MW of primarily fossil-fueled generating capacity. Xcel also has 35,200 miles of natural gas transmission and distribution pipelines. Pushing green energy sources, in 2008 Xcel announced that it would develop solar-generated power plants in Colorado as part of its green energy initiative.

The city-owned utility also produces and distributes steam to 250 customers along 14 miles of steam line. Lansing Board of Water and Light can chill out too. Its chilled water system delivers up to 10,000 tons of chilled water capacity to 14 customers to cool the interior of buildings in the downtown area. Lansing Board of Water and Light is the largest municipally owned utility in the state. It is also a major employer in the Lansing area.Letting off a little steam is a good thing for Lansing Board of Water and Light, which provides electricity to 96,000 residential, commercial, and industrial customers and water to about 55,000 customers in Lansing, Michigan

Macao Water Supply Co. Ltd,the utility supplies its customers with water from the West River's Modaomen Channel in Zhuhai City. Because of the high salinity content in the water (especially in the winter and spring months), Macao Water Supply uses a system of holding tanks and purification stations. Founded in 1932, the company is a subsidiary of Sino-French Holdings (Hong Kong) Limited (a joint venture of France-based water utility Ondeo Services and Hong Kong-based NWS Holdings Limited). As part of an ongoing maintenance strategy the company has replaced or repaired all of the distribution network that was in place in 1982.

Enel S.p.A. owns and operates more than 70 renewable energy plants in 20 states and two Canadian provinces. Enel North America's plants have a capacity to generate 748.5 MW of power (406 MW of wind power, 314 MW of hydropower, 21 MW of biomass power and 7.5 MW of geothermal power). Its wind farms use Vestas and GE Energy turbines; its largest project, the Smoky Hill Wind Farm in Kansas, has 155 wind turbines that alone generate 250 MW of power (enough to power 85,000 homes for a year). Enel North America's only biomass plant is located in Quebec, where it offsets 1 million tons of carbon dioxide by burning wood waste each year.

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