Questar Gas provides retail natural gas-distribution service to almost 900,000 customers in Utah, southwestern Wyoming and a small portion of southeastern Idaho. Questar Gas is regulated by the Public Service Commission of Utah and the Wyoming Public Service Commission. Historically, about half of the natural gas sold to Questar Gas retail customers comes from Questar-owned supplies that are typically more-stably priced than gas purchased from other suppliers. Questar Gas is also one of the most efficient natural gas utilities in the nation. As a result, rates paid by Questar Gas customers are traditionally among the lowest in the country. A Questar Gas predecessor began serving customers in 1929. In the decades since, there has never been a major natural gas service interruption.

Enerchina Holdings focuses on offering a variety of energy and public utility services in about 40 cities in China. The company generates electrical power, as well as provides more than 400,000 tons of natural gas every year through Panva Gas Holdings. Panva also offers pipeline network construction, transportation, storage, and wholesale of natural gas. Enerchina Holdings serves more than 3 million customers. The company is researching and developing other clean energy sources, including different uses of coal. Chairman Ou Yaping owns about 52% of Enerchina Holdings.

Infiltrator Systems is not connected to The Spy Who Came In From The Cold, spy satellites, or any other relic of Cold War espionage. The company is the world's leading maker of plastic leachfield products used to handle commercial and residential wastewater. Infiltrator Systems' leachfield drainage chambers are a direct and cost-effective replacement for stone and pipe leachfields, and create a footprint only half the size of traditional leachfields. The products, which are made at facilities in Kentucky and Utah, are sold throughout the US. The company estimates that one in four septic systems in the US uses Infiltrator Systems' products.

National Thermal Power Corporation (NTPC), thankfully generates enough electricity to run a lot of air conditioners. State-run NTPC, which generates almost 29% of India's power supply, has 22 coal and gas-fired power plants and interests in four more through its SAIL Power Supply joint venture. The company's plants (including joint ventures) have a combined capacity of more than 30,240 MW and feed distribution grids throughout India; prices are determined by India's Electricity Act. NTPC also offers global power consulting and engineering and construction services. India's government owns nearly 90% of NTPC.

Union Gas has a habit of bringing natural gas and energy consumers together. The utility, a subsidiary of midstream maven Spectra Energy transmits and distributes natural gas to more than 1.3 million residential and business customers in more than 400 communities throughout most of the Canadian province of Ontario. It also provides gas transportation and storage services for other utilities and businesses in Canada and the US. Union Gas operates 3,000 miles of transmission pipeline, 37,000 miles of distribution main and service pipeline, and 22 underground storage facilities.

China Three Gorges Project Corporation (CTGPC) is building the world's largest hydropower project -- the Three Gorges on the Yangtze River. Located near the Xilingxia gorge, a 185-meter-high project dam controls a drainage area of 1 million square km and an average annual runoff of 451 billion cubic meters. Construction on the massive project broke ground in 1994 and is expected to formally wrap up in late 2008. Subsidiary China Yangtze Power was set up in 2002 to manage two power plants, Gezhouba and Three Gorges. In 2009, in a major cash infusion, this unit paid its parent for the remaining 18 generators at the Three Gorges project.

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.

Sea Breeze Power, is clean energy. Formerly International Powerhouse Energy, the company is developing large-scale wind farms on the coast of British Columbia in northern Vancouver Island for power generation. It has a number of projects in various stages of development. The company is also developing underwater electricity transmission lines, as well as pursuing other renewable energy opportunities, such as hydro, energy storage, and direct current transmission projects. Key to the company's strategic planning is making the Pacific Northwest's abundant renewable energy sources available to urban areas.

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.

ThermoEnergy Corporation, a clean technologies company, develops municipal and industrial wastewater treatment systems, and carbon reducing clean energy technologies worldwide. The company's technologies include Zero Emission Boiler system, which converts fossil fuels and biomass into electricity without producing air emissions, as well as removes and captures carbon dioxide in liquid form for sequestration or beneficial reuse; and Controlled Atmosphere Separation Technology (CAST), R-CAST, and proprietary water technologies. Its technologies also comprise Ammonia Recovery Process technology that captures ammonia from dilute waste streams and converts it into ammonium sulfate; ThermoFuel Process, a renewable energy process, which converts digested or waste activated sewage sludge into an energy fuel that could be converted into electricity for use on-site or sold as a feedstock to third party industrial clients; and Enhanced Biogas Production process, which retrofits existing wastewater treatment plants to recover excess ammonia from the digesters. The company's wastewater treatment systems are used in the aerospace, food and beverage processing, metal finishing, pulp and paper, petrochemical, refining, microchip and circuit board manufacturing, heavy manufacturing, and municipal wastewater applications. Thermoenergy Corporation has a strategic alliance with Contego Systems LLC to provide solutions for airplane deicing. The company was founded in 1988 and is headquartered in Little Rock, Arkansas.

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