United Air Specialists has ESP, and the company knows just when to cause static. The company's industrial air pollution control unit makes electrostatic precipitators (ESP) that electrify airborne particles and remove them from the air. United Air Specialists also makes commercial air-cleaning systems, including kitchen emissions systems. In addition, the company makes electrostatic fluid control and high-precision spraying equipment. The company's products are used in offices, hospitals, bars, schools, and industrial settings. United Air Specialists, founded in 1966, is part of the industrial and environmental filtration business unit of manufacturing group CLARCOR.

China Power International Development Limited (China Power) is one of five national power generating groups that construct and operate large power plants in China. The company is a subsidiary of CPI Holding, and is ultimately controlled by China Power Investment Group (CPI Group). China Power owns five high-capacity coal-fired power plants, including the Pingwei Power Plant and the Yaomeng Power Plant. It also has stakes in power plants in Changshu and Shanghai. The company has an installed capacity of more than 9,000 MW. China Power also manages three other power plants, which have a total installed capacity of about 1,300 MW.

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.

PG&E Corporation is well on the way to fully recharging its batteries after losing power and declaring bankruptcy following California's energy crisis and the ensuing collapse of the wholesale energy trading industry. Its venerable Pacific Gas and Electric utility serves approximately 5.1 million electric customers and 4.3 million natural gas customers in California. The utility (founded in 1905) is also engaged in electricity generation; procurement and transmission; and natural gas procurement, transportation, and storage. In September 2010 a PG&E utility gas transmission line ruptured in San Bruno, causing a major fire, loss of life, and destruction of, or damage to, about 170 homes.

Otter Tail covers a swath of businesses, from electric services and food-ingredient processing to manufacturing equipment, plastics, and health services. Its electric utility and energy activities are subsidiaries of Otter Tail, and its subsidiary Varistar holds Otter Tail's other interests. The electric utility has been the company's core effort since Otter Tail's start in 1907; it keeps the lights on for 129,000-plus residential, commercial, and industrial customers in Minnesota and the Dakotas. Otter Tail also makes PVC pipes, wind towers, metal parts, and processes potato flakes, as well as offers diagnostic medical equipment, and construction and trucking services.

Snam Rete Gas (formerly Snam S.p.A.) transmits natural gas across Italy, managing a network of about 19,300 miles of transmission pipeline. The network includes eight regional centers, 55 local management centers, and 11 compressor stations, and transports more than 83 billion cubic meters of natural gas a year. The company is also the only liquefied natural gas (LNG) regasification and storage services provider in Italy (operating through subsidiary GNL Italia). Energy behemoth Eni controls Snam Rete Gas, which was formed in 2001. In 2009 Eni consolidated its gas units, and sold its Italgas gas distributor and its Stogit gas storage unit to Snam Rete.

Pampa Energ�a is one of Argentina's largest fully integrated electricity companies. Through subsidiaries or co-controlled companies, it generates more than 7% of the total electricity in Argentina, transmits some 95% of the country's electricity through transmission lines owned and operated by subsidiary Transener, and distributes electricity to more than 2.6 million residential and commercial customers through subsidiary Empresa Distribuidora y Comercializadora Norte (Edenor), the largest electricity distributor in Argentina. Pampa Energ�a maintains fossil fuel, thermal, and hydroelectric generation operations. Its distribution, transmission, and hydroelectric activities are regulated by Argentina's government.

Rappahannock Electric Cooperative (REC) keeps the power running smoothly. The consumer-owned cooperative provides electricity to homes, businesses, and industries in parts of 16 counties from the Blue Ridge Mountains to the mouth of the Rappahannock River in eastern Virginia. REC supplies power to 102,000 members over more than 12,000 miles of power line. Once rural in nature, the cooperative's territory has seen large pockets of suburban growth. REC offers surge protection, internet services, and home security plans to entice customers as competition from other suppliers arrives.

Manitoba Hydro-Electric (commonly called Manitoba Hydro) provides electricity to 532,000 customers in the province of Manitoba. Its power is generated from hydroelectric facilities capable of producing about 32 billion kilowatt-hours of electricity per year. Manitoba Hydro, which is owned by the government of Manitoba, also exports power to utilities and energy marketers in the US and other Canadian provinces. Through its Centra Gas subsidiary, the company distributes natural gas to 264,000 residential, commercial, and industrial customers in 100 communities in Manitoba.

EDP-Energias de Portugal, S.A. engages in the generation, supply, and distribution of electricity. It operates hydroelectric and thermal power stations, as well as wind, coal, and natural gas combined cycle power plants. EDP-Energia also involves in the supply and distribution of natural gas. It primarily operates in Portugal, Spain, France, Brazil, and the United States. EDP-Energia was incorporated in 1976 and is based in Lisbon, Portugal

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