New York Independent System Operator (New York ISO). The company, which replaced the New York Power Pool, manages and monitors wholesale activities on the state's transmission grid, which consists of some 11,000 miles of high-voltage lines. The New York ISO is charged with providing fair access to the state's competitive wholesale power market (37,400 MW of generating capacity), while ensuring the reliable, efficient, and safe delivery of power to New York's more than 19 million residents. The not-for-profit company is governed by a 10-person board of directors.

Volunteer Energy Cooperative is voluntarily cooperating with its members to serve their energy needs. The distribution utility serves more than 108,000 customers (who also own the cooperative) in 17 central and eastern Tennessee counties. It operates more than 8,400 miles of power lines. Volunteer Energy purchases its power supply from the Tennessee Valley Authority. The company also sells propane and provides telecommunications (Internet access and long-distance phone) services. In addition, Volunteer Energy offers its customer surge protection and security equipment.

Northwest Natural Gas Company stores and distributes natural gas in Oregon, Washington, and California. The company operates in two segments, Local Gas Distribution and Gas Storage. The Local Gas Distribution segment distributes natural gas in Oregon and southwest Washington. This segment engages in building and maintaining pipeline distribution system, purchasing gas from producers and marketers, contracting for the transportation of gas over pipelines from the supply basins to service territory, and reselling the gas to customers. It also transports gas owned by customers from the interstate pipeline connection, or city gate, to the customers’ facilities. This segment serves various industries, including pulp, paper, and other forest products; companies manufacturing electronic, electrochemical, and electrometallurgical products; companies engaged in processing of farm and food products; metal fabrication and casting companies; organizations that produce various mineral products, machine tools, machinery, and textiles; companies that manufacture asphalt, concrete, and rubber; printing and publishing companies; nurseries; government and educational institutions; and electric generation companies. As of December 31, 2009, it served approximately 668,000 total utility customers comprising approximately 605,000 residential, 62,000 commercial, and 1,000 industrial sales and transportation customers. The Gas Storage segment offers underground natural gas storage services to interstate and intrastate customers in the Pacific Northwest. It holds interests in approximately 8,500 net acres of underground natural gas storage in Oregon and approximately 1,900 net acres of underground natural gas storage in California; and interests in approximately 1,600 net acres of oil and gas leases in Oregon. This segment serves primarily natural gas distribution, electric generation, and energy marketing companies. Northwest Natural Gas Company was founded in 1910 and is headquartered in Portland, Oregon.

Marsulex is scrubbing up smokestacks in North America. The company provides outsourced air-quality regulation compliance services to the oil refinery and power generation industries. Among Marsulex's emission-control products are spent acid regeneration and sulphate scrubbing systems; the firm also processes and sells sulphur by-products. Customers in Marsulex's oil-refinery segment include Shell, Petro-Canada, BP, and Sunoco. The company provides services to power-generation customers worldwide. Marsulex operates seven plants in Canada and ten in the US, including one in Southern California. In 2009 investment firm Harrowston Holding acquired control of Marsulex.

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.

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.

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.

Aquilex speaks softly and carries a big wrench. Through its operating subsidiaries, Aquilex Corporation provides maintenance, repair services and technical support to heavy industry worldwide. Customers include power generation facilities and other industrial plants, including cement, chemical, petrochemical, oil and natural gas processing, pulp and paper, metal refining, and steel manufacturing operations. The company was controlled by private equity firm Harvest Partners (which bought the company from First Reserve in 2007). In 2008 Harvest Partners sold the company to Teachers' Private Capital, the private investment arm of the Ontario Teachers' Pension Plan.

Energieversorgung Weser-Ems (EWE) is a German powerhouse. Operating through some 30 subsidiaries and associated companies, EWE is a multi-service energy company primarily involved in distributing natural gas and electricity. In the past few years, however, EWE has expanded its activities to include telecommunications and information technology. EWE is Germany's fifth-largest energy company, serving more than one million electricity customers and providing about 770,000 customers with natural gas. Subsidiary EWE NaturWatt sells electricity exclusively from renewable sources. In 2008, German electricity distributor EnBW agreed to buy 26% of EWE for just more than $3 billion.

ATCO operates worldwide in utilities, power generation, and related services. Majority-owned Canadian Utilities oversees most of the group's energy businesses, including ATCO Electric and ATCO Gas (transmission and distribution) and ATCO Power (generation). Other holdings include gas gatherer and processor ATCO Midstream, and gas transporter ATCO Pipelines. ATCO I-Tek provides IT, billing, and customer care services. ATCO Structures & Logistics manufactures modular buildings and provides logistical and noise abatement services. Utilities ATCO Electric (with nearly 207,000 customers) and ATCO Gas (with more than 1 million customers) account for the largest slice of ATCO's revenues.

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