Wahlco likes to keep it clean. It designs and manufactures air pollution control equipment, specializing in ammonia handling, flue gas conditioning, nitrogen oxide control equipment which it installs at power plants and other industrial facilities, including cement plants, oil and gas refineries, pulp and paper mills, and steel mills. Wahlco also makes products such as low-watt density heaters and specialty thermocouples for industrial applications. The company's systems and equipment can be found in more than 500 locations in more than 17 countries. Wahlco was founded by a small group of experts in 1972.

Niska Gas Storage Partners LLC owns and operates natural gas storage assets in North America. It owns or contracts for approximately 185.5 billion cubic feet of total gas storage capacity. Niska Gas Storage Partners LLC owns and operates gas storage facilities in Alberta, Canada, as well as in northern California and Oklahoma, the United States. Its gas storage customers include financial institutions, producers, marketers, power generators, pipelines, and municipalities. The company was founded in 2006 and is headquartered in Houston, Texas.

MidAmerican Energy Holdings reaches farther than its name implies. The company generates, transmits, and distributes electricity and natural gas to 6.9 million customers across the US and the UK, primarily through subsidiaries MidAmerican Energy Company, PacifiCorp, and CE Electric UK. UK regional distribution subsidiaries Northern Electric and Yorkshire Electricity serve about 3.8 million electricity customers. MidAmerican Energy Holdings also has independent power production; real estate (HomeServices of America); and gas exploration, production, and pipeline operations (Kern River Gas Transmission and Northern Natural Gas). Warren Buffett's Berkshire Hathaway controls the company.

The rural distribution cooperative operates nearly 5,300 miles of transmission and distribution lines. Adams-Columbia Electric was formed through the merger of Adams-Marquette Electric Cooperative and Columbus Rural Electric Cooperative in 1987. The utility expanded further through its 1992 acquisition of Waushara Electric Cooperative. The cooperative covers a 2,500 sq. ml. geographic service area.With a name that harkens back to Christopher Columbus and the Founding Fathers, Adams-Columbia Electric Cooperative provides power to more than 36,000 member-owners in 12 counties in central Wisconsin.

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.

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.

SCS Tracer Environmental traces its financial success to its large portfolio of environmental engineering, consulting, and monitoring services. Among the firm's specialties are ambient air monitoring, counter-terrorism support, environmental advisory services and environmental construction, permitting and compliance, and risk management and safety, and research and development. In addition to private sector clients, the company also works on contracts for the federal government. SCS Tracer's staff includes atmospheric scientists, engineers, and meteorologists. The firm was named Tracer Environmental Sciences & Technologies until being acquired by SCS Engineers in late 2009.

Light and Power Company (CL&P) keeps the folks in the Constitution State connected. CL&P provides electric utility services to more than 1.2 million customers (more than 90% residential) in nearly 150 Connecticut communities. The electric utility, a subsidiary of Northeast Utilities (NU), has more than 235 substations, almost 280,800 transformers and owns and operates regulated transmission and distribution assets in its 4,400-sq.-mile service territory. It has more than 22,800 miles of distribution lines and almost 1,700 miles of transmission lines. CL&P's transmission assets are monitored by ISO New England.

Portsmouth Water Limited serves an area of the UK extending from South East Hampshire to West Sussex, and from the River Meon to the River Arun. Portsmouth Water supplies about 160 million liters of water per day. Its 301,200 customers include industries, government establishments, and commercial businesses, as well as a residential population of 657,000. The company operates a 3,270-km network of water mains and about 20 treatment works. About 85% of the company's supply comes from groundwater sources.

NSTAR is looking to outshine its rivals through the efficiency of its regulated electric and natural gas sales, distribution, and transmission operations. The utility holding company transmits and distributes electricity to almost 1.2 million homes and businesses through NSTAR Electric and serves some 300,000 natural gas customers in Massachusetts through NSTAR Gas. The company also markets wholesale electricity, and operates liquefied natural gas (LNG) processing and storage facilities. Its NSTAR Communications unit owns about 240 miles of fiber optic network. In 2010 the company agreed to be acquired by Northeast Utilities for about $4.2 billion.

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