Energen Corporation, an energy holding company, engages in the acquisition, exploration, development, and production of oil, natural gas, and natural gas liquids in the continental United States. It also involves in the purchase, distribution, and sale of natural gas to residential, commercial, and industrial customers, as well as other end-users of natural gas in central and north Alabama. In addition, the company provides gas transportation services for industrial and commercial customers located on its distribution system. As of December 31, 2009, Energen Corporation had proved oil and gas reserves of 1,547 billion cubic feet equivalent in the San Juan Basin in New Mexico and Colorado, the Permian Basin in west Texas, and the Black Warrior Basin in Alabama. Energen Corporation was founded in 1929 and is headquartered in Birmingham, Alabama.

ITC Holdings Corp. (NYSE: ITC) invests in the electricity transmission grid to improve electric reliability, expand access to markets, lower the overall cost of delivered energy and allow new generating resources to interconnect to its transmission systems. The largest independent electricity transmission company in the country, ITC operates high-voltage transmission systems in Michigan’s Lower Peninsula and portions of Iowa, Minnesota, Illinois, Missouri and Kansas, serving a combined peak load in excess of 25,000 megawatts through its regulated operating subsidiaries, ITCTransmission, Michigan Electric Transmission Company (METC), ITC Midwest and ITC Great Plains. ITC also focuses on new areas where significant transmission system improvements are needed through ITC Grid Development and its subsidiaries.

City of Tacoma Department of Public Utilities was fated to fulfill the electric and water desires of the City of Destiny's dwellers. The municipal utility's Tacoma Power unit generates, transmits, and distributes electricity to more than 166,000 homes and businesses in Tacoma, Washington. Tacoma Water serves about 96,000 customers; the division's water supply comes from wells and the Green River Watershed. Tacoma Public Utilities also oversees Tacoma Rail, a freight-switching railroad with some 200 miles of track, and the Click! Network, a high-speed data network that uses fiber-optic cable.

North Carolina Electric Membership Corporation (NCEMC) generates and transmits electricity to the state's 26 electric cooperatives in 93 of North Carolina's 100 counties. The co-op owns more than 600 MW of generating capacity through four primarily natural gas peak load generators, plus a 62% stake in Catawba Nuclear Station Unit 1, and a 31% stake in the common facilities of the Catawba Nuclear Station in South Carolina. It also buys power from Progress Energy, American Electric Power, and other for-profit utilities. NCEMC's member cooperatives serve more than 950,000 businesses and homes in North Carolina. The wholesale co-op also operates an energy operations center.

Not-for-profit holding company Glas Cymru owns Dwr Cymru Welsh Water, one of the largest regulated water and sewerage companies in the UK. Welsh Water distributes water and provides wastewater services to 1.3 million household customers and more than 100,00 business customers in Wales and England. It has a network of about 560 service reservoirs. The company supplies 850 million liters of drinking water daily through its 27,000-km network of water mains. Its sewer system includes 19,000-km of sewers and more than 800 wastewater-treatment works. Formed in 2000, Glas Cymru bought Welsh Water from Western Power Distribution in 2001. Western Power Distribution had acquired Hyder, Welsh Water's parent, in 2000.

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

AEA Technology has hitched its wagon to the climate change star, focusing on government and private sector efforts to combat global warming, develop low-carbon processes, and monitor carbon and emissions trading. AEA Technology offers consulting, program management, and emergency response services for commercial, government, and industrial customers. Other areas of expertise include agriculture, health, business innovation, and transport. It is a major provider of advisory services to the UK government on climate change issues and technologies.

Sembcorp Industries can help your ship keep its shape or sell you electricity, among other things. Its 62%-held Sembcorp Marine subsidiary, the #2 offshore oil rig maker in the world, specializes in marine and offshore engineering services such as ship building and conversion, repair, and rig building. Sembcorp Utilities (also known as SembUtilities) is a leading retailer of electricity in Singapore; it also provides utility services and water management services (wastewater, reclaimed water, desalination, water for industrial use). Singapore's government (through investment company Temasek Holdings) controls 49% of Sembcorp Industries, which serves clients primarily in the Asia/Pacific region and in Europe.

Catalytic Combustion Corporation clears the air -- literally and alliteratively. The company makes systems, processes, and products to help customers eliminate volatile organic compounds (VOCs) and other pollutants in order to meet air-quality standards. Catalytic Combustion's catalysts -- substances that accelerate the rate of chemical reactions -- are used in a host of industries and products, ranging from appliances to graphic arts to nuclear power plants. The company makes catalysts from materials such as ceramics, metal foil, and wire mesh. Catalytic Combustion was founded in 1950.

3E won't touch your hazardous materials, but the company will tell you what you need to know about them. 3E provides environmental, health, and safety (EH&S) information management services to help customers respond to emergencies and comply with federal regulations. The company maintains a database of 3.7 million material safety data sheets about materials used at the facilities of its more than 5,000 customers worldwide, and it provides around-the-clock telephone access to hazardous-materials experts. Customers include companies and governmental bodies such as Bostik, Southwest Airlines, Costco Wholesale, and the City of Amarillo. In 2010 the company agreed to be acquired by Verisk Analytics for $110 million.

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