China Yangtze Power co. (CYPC) generates hydropower on the Yangtze River from its two hydropower plants -- The Three Gorges Power Plant and Gezhouba Power Plant. CYPC oversees China's Three Gorges Dam project (the world's largest hydroelectric dam) on behalf of China Yangtze Three Gorges Development, which holds more than 60% of CYPC. In addition the company also provides production technology consultancy, water electric construction support, and repair and maintenance services. It also manages and invests in other power projects. CYPC manages a generating capacity of about 12,600 MW. The company was founded in 2002.

NORESCO provides utility customers in the US with infrastructure development, design/build services, commissioning strategies, financing, and client-centered asset management services. The company develops and implements build/own/operate distributed generation, cogeneration, or combined heat and power projects; arranges, on a consulting basis, commodity electricity or gas supply; and provides firm contracting of energy supply. It also holds interests in independent power plants. Global leader in HVAC products and systems Carrier, a unit of UTC, owns NORESCO.

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.

Empire District Electric (EDE) has the sovereign authority to light up its territory. The utility transmits and distributes electricity to a population base of more than 450,000 (or about 215,000 direct customers) in southwestern Missouri and adjacent areas of Arkansas, Kansas, and Oklahoma. It also supplies water to three Missouri towns and natural gas throughout most of the state. EDE's interests in fossil-fueled and hydroelectric power plants give it a generating capacity of 1,257 MW; it also buys and sells power on the wholesale market. In addition, the company is pursuing nonregulated opportunities such as leasing capacity on its fiber-optic network.

Alabama Power powers up Southern Rockers and others in the heart of Dixie. The Southern Company subsidiary provides electricity to nearly 1.4 million residential and business customers in Alabama. The utility operates more than 91,000 miles of transmission and distribution lines, and it has nuclear, hydroelectric, and fossil-fueled power plant interests that give it a generating capacity of more than 12,200 MW. Alabama Power sells wholesale power to more than 15 municipal and rural distribution utilities; it also provides steam transmission (used for heating and cooling buildings) in downtown Birmingham, Alabama, and sells electric appliances (such as thermostats, ovens, and washing machines)

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.

EcoWater Systems is in a pristine spot. The company manufactures commercial and residential water treatment systems. It sells its products through a network of more than 1,400 dealers, wholesalers, and private-label retailers. Products include water refiners, conditioners, and purifiers, and innovations such as reverse osmosis drinking water systems. Founded in 1925, EcoWater Systems is a member of Berkshire Hathaway's Marmon Group and maintains its autonomous management. In addition to the US, the company operates in Canada, the UK, Europe, and China.

Shell International Renewables (doing business as Shell Renewables) may be able to turn them into fuel to power homes and vehicles. The company oversees many of the parent Royal Dutch Shell's operations in alternative fuels, was formed in 1997 to commercially explore the global possibilities of new low-carbon power systems. Shell Renewables markets and distributes alternative energies from the sun, the wind, hydrogen (technically an energy carrier rather than energy source), and bio-fuels worldwide. It is researching hydrogen created from natural gas and bio-fuels, made of everything from corn to algae, to replace gasoline in cars.

Alpheus Environmental finds answers in a range of environmental-related services: water and wastewater treatment, operations and maintenance, infrastructure management and contracting, waste management and recycling, and technical support. A unit of water utility group AWG (formerly Anglian Water), it offers design, build, and project management services for blue-chip companies in the process industry. Services include installing water, gas, electricity, roads, and sewers on development sites. Customers include TOTAL, Whitbread, and the Derby City Council. Alpheus Environmental manages water management, waste minimization, and recycling sites across the UK.

Pacific Northern Gas (PNG) provides natural gas in west-central and northeastern British Columbia. The utility serves more than 39,100 residential, commercial, and industrial customers over its transmission and distribution system. Its large industrial customers include timber company West Fraser and metals maven Rio Tinto Alcan. In 2008 these customers accounted for about 26% of PNG's annual total gas deliveries and more than 5% of its revenues. British Columbia Hydro and Power Authority (BC Hydro) is also a major customer. Most of PNG's customers buy gas directly from producers or suppliers but contract with PNG to have it pipelined to them. Pacific Northern Gas Ltd. entered the renewable power business in 2010.

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