Memphis Light, Gas and Water Division (MLGW) helps lighten up the Memphis blues. The municipally owned utility provides electricity, water, and natural gas services for all of Shelby County, Tennessee, including the city of Memphis. It serves primarily residential and commercial customers. MLGW buys electricity from the Tennessee Valley Authority (TVA) and distributes it to more than 420,000 customers. The company purchases natural gas on the spot market, transmits it through open access pipelines, and delivers it to about 320,000 customers. Through its artesian water system, MLGW supplies water to more than 257,000 customers.

New Hampshire warm in winter, but New Hampshire Electric Cooperative will. The utility provides electricity to about 80,000 residential and business customers (who are also member-owners of the cooperative) in 115 New Hampshire towns and cities. The enterprise operates 5,400 miles of distribution lines, and is seeking to become a complete energy solutions organization, offering energy saving options such as equipment retrofits at local schools and selling energy-efficient compact fluorescent light bulbs. Most of New Hampshire Electric Cooperative's revenues comes from residential customers, and the balance form small businesses.

This Springfield is not Homer Simpson's hometown, or Abe Lincoln's. City Utilities of Springfield, Missouri supplies electricity, natural gas, and water for residents and businesses in the southwestern Missouri town. The utility, which has about 1,970 miles of power lines and 1,300 miles of natural gas mains, serves about 106,560 electric customers, more than 82,220 natural gas customers, and more than 76,600 water customers. It also operates the municipal bus system, which has 25 regular street buses and five demand/response buses. City Utilities of Springfield has a service region of 320 sq. ml. and serves a base population of 229,000.

Trojan Technologies wants to zap you. The company manufactures ultraviolet (UV) lighting systems for disinfecting wastewater and treating contaminated soil and groundwater. Trojan's wastewater treatment systems are used in about 4,000 municipalities in 50-plus countries. The company's UV light systems work by altering the DNA in microorganisms and are an alternative to traditional chlorine-based disinfection systems. Trojan also makes UV products that cleanse water used in industrial processes such as food production and electronics manufacturing. Other products include residential UV systems for drinking water. Danaher controls Trojan.

Black Hills Power has been delivering energy for over 125 years. It was formed through the consolidation of several smaller electric suppliers in the Black Hills of South Dakota, Montana and Wyoming. Black Hills Power is an investor-owned utility and is part of the Black Hills Corporation family. The utility serves 63,500 customers in 20 communities located in Western South Dakota, Northern Wyoming, and Southeastern Montana.Our customers use 1,501,805,000 kilowatt hours (kWh) of electricity at an average price of $0.0714 per kWh. Cost containment efforts and customer load growth have provided our customers with stable residential electricity costs and our commercial electricity costs that are declining in real terms, and have remained stable for the last 11 years.

San Antonio Water System provides water and wastewater services to 344,200 customers, or about 1 million people, in the San Antonio metropolitan area (including most of the city of San Antonio, several suburban municipalities, and adjacent parts of Bexar County). The utility is owned by the City of San Antonio. SAWS was formed in 1992 through a merger of three entities: the City Water Board, the City Wastewater Department, and the Alamo Water Conservation and Reuse District.

Ozocan can meet the ozone generator and purifier needs of its water and waste water clients. Ozocan (formerly Hankin Water Technologies) provides water-purification equipment for aquaculture, commercial aquariums, drinking-water treatment, industrial-waste treatment, and other uses. The company has also supplied ozone to laminating plants to speed up the application of polyethylene to paper. Ozone systems have been used to treat drinking water for decades, in both municipal and commercial bottling plants, and have been widely used in swimming pools since the 1950s. The company was established in 1954.

North Wind works to keep the air clean, the ground fresh, and the water clear in North America. The environmental consulting firm's services include site assessment, soil and groundwater remediation, geographic information system (GIS) data, hazardous and nonhazardous waste management, and project engineering and construction. North Wind has expanded by buying South Carolina-based Pinnacle Consulting Group, which offers engineering, environmental, and information technology consulting services.

Through its regulated utility subsidiaries, Aquarion distributes water to more than 180,000 homes and businesses (or about 580,000 people) in some 39 communities in Connecticut, Massachusetts, and New Hampshire. It is one of the 10 largest investor-owned utilities in the US. The company's Aquarion Services unit provides contract management of municipal water and wastewater systems, along with engineering and management consulting services and consumer water line protection plans. In 2007 UK-based Kelda Group sold control of Aquarion to Australia's Macquarie Bank for $860 million.

Tenaga Nasional Berhad (TNB) keeps away malaise as it electrifies Malaysia. The largest power company in Southeast Asia, TNB generates two-thirds of the electricity on the Malaysian Peninsula. The company has a generating capacity of more than 11,940 MW; it also operates the national power transmission and distribution grid, which serves more than 7 million residential, industrial, and commercial customers. A host of subsidiaries support TNB's business; they include power equipment manufacturing, engineering, and real estate companies. Although Malaysia's power industry is undergoing deregulation, TNB has successfully resisted efforts to split up the company, which is 38%-owned by Khazanah Nasional Berhad.

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