Pepco Holdings has more power than any politician in the populace of the US capital. The holding company distributes electricity and natural gas through its Potomac Electric Power (Pepco), Delmarva Power & Light, and Atlantic City Electric utilities to about 1.9 million customers in Delaware, Maryland, New Jersey, and Washington, DC. Nonregulated operations include independent power production, wholesale and retail energy marketing, and energy management services, through the company's Pepco Energy Services units.

OGE Energy is the holding company for the largest electric utility in Oklahoma, but its largest revenue producer is its energy marketing and natural gas transmission unit, OGE Energy Resources. OGE owns Oklahoma Gas and Electric (OG&E), a public utility with almost 777,000 retail and wholesale customers in Oklahoma (including Oklahoma City) and a bit of western Arkansas. OG&E owns coal- and gas-fired power plants that generate 6,420 MW of capacity. Subsidiary Enogex operates 7,900 miles of natural gas gathering and transportation pipeline. The company also provides physical, asset, financial management services through marketing unit OGE Eenergy Resources.

Environmental Waste Controls (EWC) slows down the fill-up of UK landfills. The company leases and sells waste-compactor equipment and provides maintenance services for the compactors. It also collects, transports, and recycles or disposes of waste for its 400-plus public- and private-sector customers, which include manufacturing and retail companies, food processors, hotels (such as Hilton and Radisson Hotels), railway stations, National Health Service Trusts, and local governments. The company was the subject of a management buyout in 2004. EWC was founded in 1993.

Tenaga Nasional Berhad (TNB) keeps away malaise as it electrifies Malaysia. The largest power company in Southeast Asia, TNB generates two-thirds of the electricity on the Malaysian Peninsula. The company has a generating capacity of more than 11,940 MW; it also operates the national power transmission and distribution grid, which serves more than 7 million residential, industrial, and commercial customers. A host of subsidiaries support TNB's business; they include power equipment manufacturing, engineering, and real estate companies. Although Malaysia's power industry is undergoing deregulation, TNB has successfully resisted efforts to split up the company, which is 38%-owned by Khazanah Nasional Berhad.

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.

Detroit Edison generates and distributes electricity to 2.1 million customers in Michigan. The utility, a unit of regional power player DTE Energy, has more than 11,080 MW of generating capacity from its interests in nfossil-fueled, nuclear, and hydroelectric power plants. It operates more than 44,000 circuit miles of distribution lines and owns and operates about 680 distribution substations. Detroit Edison also sells excess power to wholesale customers and provides coal transportation services.

Central Vermont Public Service Corporation, together with its subsidiaries, operates as an electric utility company. The company engages in the purchase, production, transmission, distribution, and sale of electricity. It sells electricity to residential, commercial, and industrial customers. As of December 31, 2009, the company served approximately 159,000 retail customers in Vermont. Its wholly owned plants included 20 hydroelectric generating facilities with an aggregate nameplate capacity of 45.3 megawatts; and 2 oil-fired gas turbines with a combined nameplate capacity of 26.5 megawatts. The company also owns, buys, sells, and leases real and personal property and interests therein related to the utility business; and sells and rents electric water heaters in Vermont and New Hampshire. In addition, it has joint ownership interests in electric generating and transmission facilities. The company was founded in 1929 and is based in Rutland, Vermont.

Ozocan can meet the ozone generator and purifier needs of its water and waste water clients. Ozocan (formerly Hankin Water Technologies) provides water-purification equipment for aquaculture, commercial aquariums, drinking-water treatment, industrial-waste treatment, and other uses. The company has also supplied ozone to laminating plants to speed up the application of polyethylene to paper. Ozone systems have been used to treat drinking water for decades, in both municipal and commercial bottling plants, and have been widely used in swimming pools since the 1950s. The company was established in 1954.

Renegy Holdings (formerly Catalytica Energy Systems) was formed in the 2007 merger of Catalytica with the renewable energy divisions of NZ Legacy, a land and energy development firm. Among other ventures, Renegy has built a biomass power generation plant near Snowflake, Arizona, that came online in 2008. The company has long-term power purchasing agreements in place with Arizona Public Service and Salt River Project to buy biomass electricity from the Snowflake White Mountain Power plant. To save costs, in 2009 Renegy delisted its stock from the NASDAQ exchange.

Egad, EGAT, that's a lot of juice. The state-owned Electricity Generating Authority of Thailand (EGAT) produces more than 15,000 MW of electricity and buys another 10,600 MW from independent power producers. EGAT not only generates or buys most of the nation's power, it holds a monopoly on transmission to the distributors (Metropolitan Electricity Authority and Provincial Electricity Authority). The utility operates hydroelectric, thermal, and alternative power plants, and provides engineering, maintenance, and other energy-related services. EGAT has also announced plans to expand into telecommunications and natural gas, and to acquire coal mining assets in Indonesia.

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