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.

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

Energy Future Holdings (formerly TXU) has seen the future and it works -- powered by electricity. The company is the largest nonregulated retail electric provider in Texas (TXU Energy), with 2.1 million customers, and through its Luminant unit it has a generating capacity of more than 15,510 MW from its interests in nuclear and fossil-fueled power plants in the state. Energy Future Holdings has regulated power transmission and distribution operations through 80%-owned Oncor Electric Delivery. Oncor operates the largest regulated distribution and transmission system in Texas, providing power to more than 3.1 million electric delivery points over more than 117,000 miles of transmission and distribution lines.

Clean Energy Fuels Corp., together with its subsidiaries, provides natural gas as an alternative fuel for vehicle fleets in the United States and Canada. It designs, builds, finances, and operates fueling stations; and supplies compressed and liquefied natural gas. Clean Energy Fuels Corp. also produces renewable biomethane, which could be used as vehicle fuel. In addition, it provides natural gas conversions, alternative fuel systems, application engineering, service and warranty support, and research and development for natural gas vehicles. As of December 31, 2009, the company served approximately 390 fleet customers operating 17,790 natural gas vehicles in public transit, refuse hauling, airports, taxis, seaports, and regional trucking markets. It owned and operated 196 natural gas fueling stations in Arizona, California, Colorado, the District of Columbia, Florida, Georgia, Idaho, Maryland, Massachusetts, Nevada, New Jersey, New Mexico, New York, Ohio, Oklahoma, Texas, Virginia, Washington, and Wyoming; and British Columbia and Ontario, Canada. Clean Energy Fuels Corp. was incorporated in 2001 and is headquartered in Seal Beach, California.

Deriving its name from an old Eskimo tribal word, Chugach Electric Association generates, transmits, distributes, and sells electricity in Alaska's railbelt region. This area extends from the coastal Chugach Mountains into central Alaska and includes the state's two largest cities (Anchorage and Fairbanks). The member-owned cooperative utility has 530 MW of generating capacity from its natural gas-fired and hydroelectric power plants. Serving 80,300 metered retail locations, Chugach Electric, the largest electric utility in Alaska, also sells wholesale power to other municipal and cooperative utilities in the region.

GeoSyntec Consultants provides services such as environmental management, geotechnical engineering, groundwater assessment and remediation, pollution prevention, and surface water management. The company operates from more than 30 offices, primarily in the US but also in Canada, Malaysia, and the UK. Its clients include Aerojet-General, AstraZeneca, Chevron, Delta Air Lines, FMC Corp., Georgia Power, Kimberly-Clark, Lockheed Martin, Pharmacia & Upjohn, and Shell Oil. Expanding its services in the water and natural resources segment, in 2010 Geosyntec acquired Rainwater Recovery, which focuses on rainwater harvesting technology.

Cambridge Water distributes water to about 125,000 residential customers and business customers in the greater Cambridge area. Overall, the company serves a population of about 300,000. Cambridge Water maintains some 2,140 km of water mains and 34 storage towers and reservoirs. All the water supplied to customers is pumped from 25 underground sources. About 55% of water billed is charged by meter. The company offers its clients the delivery of emergency bottled water; customers pre-order water that Cambridge Water will deliver in the event of a major incident. The company is controlled by Cheung Kong Infrastructure Holdings.

Veolia Water Central Limited provides water to more than 3.5 million customers. Veolia Water Central provides water services to a number of counties (including Bedfordshire, Berkshire, Buckinghamshire, Essex, Hertfordshire, and Surrey, as well as the London boroughs of Barnet, Brent, Ealing, Enfield, Harrow, and Hillingdon). The company is a subsidiary of Veolia Environnement, a France-based utility and environmental services giant. Veolia Water Central traces its origins back some 130 years.

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.

Associated Electric Cooperative makes the connection between power and cooperatives. The utility provides transmission and generation services to its six member/owner companies, which in turn provide power supply services to 51 distribution cooperatives in three Midwest states. (The distribution cooperatives have a combined customer count of more than 875,000.) Associated Electric operates 9,520 miles of power transmission lines and has about 5,240 MW of generating capacity from interests in primarily coal- and gas-fired power plants and from wholesale energy transactions with other regional utilities.

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