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.

Theolia's answer to renewable energy, my friend, is blowin' in the wind. The company develops wind farms in Europe (France, Italy, Germany, and Spain), and Latin America, as well as in emerging markets such as India and Morsocco, for generating electricity. Theolia has an installed capacity of 350 MW and operates a further 311 MW for third parties. The company has another 2,800 MW of wind power generation under construction or in development. In order to focus on wind power, Theolia transferred its non-wind generation assets, including biomass, biogas, and solar, to its Thenergo subsidiary, which it subsequently sold.

Water is delivered by Mediterranea delle Acque (formed by the early 2006 merger of Italian water utilities Ferrari -- Acquedotto De Ferrari Galliera, Acquedotto Nicolay, Acqua Italia, and Genova Acque. Prior to the merger Acquedotto De Ferrari Galliera delivered about 45 million cubic meters (1.5 billion cubic feet) of water annually to about 350,000 customers. The company is also is involved in firefighting services, electricity sales, and water well-drilling. Rome-based utility AMGA owns 68% of the company.

Making money by water, Biwater provides water and wastewater treatment services to a range of customers in more than 90 countries. The company also offers water infrastructure investment, consultancy and operation; water asset management; and project management for water leisure facilities. Its Biwater Leisure unit has installed several Olympic-sized pools for almost 40 years. Its international projects include the design and installation of a wastewater treatment plant in Dubai, and a water distribution system for 4.2 million customers in Malaysia. Biwater also designs and builds desalination plants. Focusing on international growth, in 2010 it sold its UK-based Biwater Services Limited unit to MWH Global.

Missouri Gas Energy delivers natural gas in the "Show-Me" state. The utility, an operating unit of national natural gas power player Southern Union, distributes natural gas to more than 500,000 customers in 155 cities and towns located in central and western Missouri. Its territory stretches from St. Joseph in the north to Joplin and neighboring areas in the south, and from the Kansas border east to Ozark (near Springfield). Missouri Gas Energy has facilities in St. Joseph, Lees Summit, Warrensburg, Joplin, Republic, Neosho, and Monett. The Missouri Public Service Commission oversees Missouri Gas Energy's operations.

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.

Exelon Corporation company distributes electricity to 5.4 million customers in northern Illinois (including Chicago) and southeastern Pennsylvania (including Philadelphia) through subsidiaries Commonwealth Edison (ComEd) and PECO Energy. PECO also distributes natural gas to 485,000 customers. Subsidiary Exelon Generation holds the company's power plants, whose production capacity is just about 25,000 MW. About two-thirds of Generation's power is nuclear. Exelon Power Team is a top wholesale energy marketer, and Exelon Energy markets retail power and offers other energy-related services.

Energy and Power Solutions (EPS) would like to help. The start up company, which promises up to a 25% energy savings using its methods, makes most of its money building on-site clean energy power plants. It also sells electrical and thermal power and operates power plants on behalf of its customers. But EPS touts its xChange Point energy monitoring software as the growth engine of the future. The software tracks energy use at the device, plant, and enterprise level in real time; EPS analysts use the data to recommend energy saving changes. The company, which filed to go public in 2010, has four customers using its products at more than 60 locations.

Dairyland Power Cooperative provides its customers with lots of juice in the land of lactose. The firm provides electricity generation (about 1,420 MW of generating capacity) and transmission services for 25 member distribution cooperatives and 16 municipal utilities in five states (including Wisconsin). The member cooperatives and municipal utilities in turn distribute electricity to almost 252,900 consumers. Dairyland Power generates more than 1,100 MW of capacity from its coal-fired power plants; it also operates 3,150 miles of transmission lines and 280 substations.

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.

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