Ocean Power Technologies (OPT) is all about is the company, with offices in the US and UK, uses a proprietary system called PowerBouy to generate electricity using the mechanical energy produced when offshore waves move the anchored buoys up and down. OPT offers a buoy system that connects to power grids as well as an autonomous one that can be used in remote locations and for tsunami monitoring, oceanographic data collection, and offshore aquaculture. Customers include the US Navy, Spanish power producer Iberdrola, and Spanish energy firm TOTAL. It has a contract with Lockheed Martin to build a large power generation system off the west coast of the US.

MidAmerican Energy Holdings reaches farther than its name implies. The company generates, transmits, and distributes electricity and natural gas to 6.9 million customers across the US and the UK, primarily through subsidiaries MidAmerican Energy Company, PacifiCorp, and CE Electric UK. UK regional distribution subsidiaries Northern Electric and Yorkshire Electricity serve about 3.8 million electricity customers. MidAmerican Energy Holdings also has independent power production; real estate (HomeServices of America); and gas exploration, production, and pipeline operations (Kern River Gas Transmission and Northern Natural Gas). Warren Buffett's Berkshire Hathaway controls the company.

IDACORP, Inc., through its subsidiary, Idaho Power Company, engages in the generation, transmission, distribution, sale, and purchase of electric energy in the United States. It owns and operates 17 hydroelectric generating plants located in southern Idaho and eastern Oregon, as well as 2 natural gas-fired plants situated in southern Idaho; and owns interests in 3 coal-fired steam electric generating plants located in Wyoming, Nevada, and Oregon. As of December 31, 2009, the company supplied electric energy to approximately 490,000 general business customers involved in food processing, electronics and general manufacturing, forest products, beet sugar refining, and winter recreation industries. It had a network of approximately 4,796 pole miles of high-voltage transmission lines, 23 step-up transmission substations located at power plants, 22 transmission substations, 8 switching stations, 223 energized distribution substations, and approximately 26,675 pole miles of distribution lines. IDACORP, Inc., through its other subsidiaries, invests in housing and other real estate properties in the United States, Puerto Rico, and the U.S. Virgin Islands; and has a 50% interest in 9 hydroelectric plants with a total generation capacity of 45 MW in Idaho and northern California. The company was founded in 1915 and is based in Boise, Idaho.

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.

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.

EQT Corporation, together with its subsidiaries, operates as an integrated energy company in the United States. The company operates in three segments: EQT Production, EQT Midstream, and Distribution. The EQT Production segment engages in the exploration, development, and production of natural gas and crude oil in the Appalachian Basin. This segment’s properties are located primarily in Kentucky, West Virginia, Virginia, and Pennsylvania. As of December 31, 2009, it had 4.1 trillion cubic feet of proved reserves across 3.4 million acres. The EQT Midstream segment provides gathering, processing, transmission, and storage services to third parties in the Appalachian Basin. It has approximately 10,650 miles of gathering lines and 970 miles of transmission lines. The Distribution segment engages in the distribution and sale of natural gas to residential, commercial, and industrial customers in southwestern Pennsylvania, West Virginia, and eastern Kentucky. This segment served natural gas to approximately 275,900 customers comprising of 257,300 residential, and 18,600 commercial and industrial customers. The company was formerly known as Equitable Resources, Inc. and changed its name to EQT Corporation in February 2009. EQT Corporation was founded in 1925 and is headquartered in Pittsburgh, Pennsylvania.

Tractebel Engineering (formerly SUEZ-TRACTEBEL) is Belgium's top utility holding company and one of the world's top independent power producers, with operations in more than 100 countries on five continents (through Suez Energy International). As part of the family of companies that make up French energy conglomerate GDF SUEZ, Tractebel Engineering distributes electricity and natural gas; transports and stores gas; is involved in energy trading and marketing; and offers energy and industrial management, infrastructure, and engineering services. GDF SUEZ subsidiary and #1 power producer in Belgium, Electrabel, took ownership of the company in 2007.

Summit Energy Services is a major provider of energy management and procurement services for industrial and commercial companies, and operates in 56 countries. A consolidator in a fragmented industry, the company's offerings include market intelligence reporting, need and competitive supply analysis, contract negotiation, utility bill auditing, risk advisory planning, and energy efficiency projects. It serves the automotive, healthcare, transportation, and food industries, as well as chemical, metal, paper, and plastic manufacturing companies, and municipal and state governments and hospitality and real estate management enterprises. Summit Energy Services has more than 650 clients.

Enel S.p.A. owns and operates more than 70 renewable energy plants in 20 states and two Canadian provinces. Enel North America's plants have a capacity to generate 748.5 MW of power (406 MW of wind power, 314 MW of hydropower, 21 MW of biomass power and 7.5 MW of geothermal power). Its wind farms use Vestas and GE Energy turbines; its largest project, the Smoky Hill Wind Farm in Kansas, has 155 wind turbines that alone generate 250 MW of power (enough to power 85,000 homes for a year). Enel North America's only biomass plant is located in Quebec, where it offsets 1 million tons of carbon dioxide by burning wood waste each year.

Southern Pine Electric Power Association (Southern Pine EPA) delivers the consumer-owned utility cooperative that serves about 65,000 members in south central Mississippi. The cooperative provides power over more than 10,000 miles of line to some 60,400 residential meters and 4,600 commercial meters. A board of directors, elected by Southern Pine EPA membership, sets the policies and establishes the business structure of the organization, which is led on a day-to-day operational basis by a general manager. Southern Pine EPA established four district offices in 1994 to enable the cooperative to better serve its large service area.

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