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.

Clean Energy Fuels Corp., together with its subsidiaries, provides natural gas as an alternative fuel for vehicle fleets in the United States and Canada. It designs, builds, finances, and operates fueling stations; and supplies compressed and liquefied natural gas. Clean Energy Fuels Corp. also produces renewable biomethane, which could be used as vehicle fuel. In addition, it provides natural gas conversions, alternative fuel systems, application engineering, service and warranty support, and research and development for natural gas vehicles. As of December 31, 2009, the company served approximately 390 fleet customers operating 17,790 natural gas vehicles in public transit, refuse hauling, airports, taxis, seaports, and regional trucking markets. It owned and operated 196 natural gas fueling stations in Arizona, California, Colorado, the District of Columbia, Florida, Georgia, Idaho, Maryland, Massachusetts, Nevada, New Jersey, New Mexico, New York, Ohio, Oklahoma, Texas, Virginia, Washington, and Wyoming; and British Columbia and Ontario, Canada. Clean Energy Fuels Corp. was incorporated in 2001 and is headquartered in Seal Beach, California.

Lyntegar Electric Cooperative is based in the agricultural heart of the Texas Panhandle, where the summer heat sizzles and the winter ice storms freeze. The rural power cooperative provides electric utility services to customers in Borden, Dawson, Gaines, Garza, Hockley, Lynn, Martin, Terry, and Yoakum counties. The cooperative also sells electric grills and provides internet and television services. In addition, Lyntegar Electric Cooperative produces Typically Texas Cookbooks, which share collections of recipes used by cooperative member-consumers.

Southern Water Services provides water to about 1 million households in South East England. In addition, Southern Water provides wastewater services to about 2 million households. The company has 90 water treatment works, 150 water supply booster stations, and another 370 wastewater treatment works. It maintains a network of some 13,600 km of water mains. The utility also recycles sewerage sludge for use in agriculture. Its area of operation includes Kent, Sussex, Hampshire, and the Isle of Wight. Southern Water is owned by Greensands Investments Limited, which is owned by infrastructure investors and pension funds.

Let's cut right to the point: construction materials and mining used to be the lifeblood of Knife River Corporation, but in recent years, its energy and utility operations have grown to be the largest portion of its business. Oil and natural gas production, power transmission, pipelines and power utilities now dominate Knife River's balance sheet. But don't count out its construction services division, which continues to produce record earnings. Knife River has operations in Alaska, Hawaii, Oregon, California, Idaho, Minnesota, Montana, North Dakota, Oregon, Texas, and Wyoming. The company is a subsidiary of MDU Resources Group, Inc.

Companhia de Saneamento de Minas Gerais provides water supply (for about 12 million people) and sewage treatment services in more than 600 municipalities in the country's state of Minas Gerais. Founded in 1963, COPASA serves customers such as private companies, government agencies, and individuals. The government of Minas Gerais established the company under the name Companhia Mineira de Água e Esgotos in order to enforce the sanitation policy for the state. COPASA receives payment for its services in the form a tariff, which takes into account customers' consumption ranges, as well as inflation.

AES is one of the world's leading independent power producers. The company has interests in more than 120 generation facilities in about 30 countries throughout the Americas, Asia, Africa, Europe, and the Middle East that give it a combined net generating capacity of 40,300 MW. AES sells electricity to utilities and other energy marketers through wholesale contracts or on the spot market. AES also sells power directly to customers worldwide through its interests in distribution utilities, mainly in Latin America. In 2009 the company had 1,900 MW of power plants under development in four countries.

Dairyland Power Cooperative provides its customers with lots of juice in the land of lactose. The firm provides electricity generation (about 1,420 MW of generating capacity) and transmission services for 25 member distribution cooperatives and 16 municipal utilities in five states (including Wisconsin). The member cooperatives and municipal utilities in turn distribute electricity to almost 252,900 consumers. Dairyland Power generates more than 1,100 MW of capacity from its coal-fired power plants; it also operates 3,150 miles of transmission lines and 280 substations.

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.

Thames Water Holdings plc provides regulated water to 8.5 million customers and wastewater services to about 13.6 million people in London and the Thames Valley. It operates 100 water treatment plants, about 290 pumping stations, and 235 reservoirs. On the wastewater side of the business the company operates 43,500 miles of sewer lines and 350 wastewater treatment plants. In addition to its water and wastewater operations, Thames Water offers consulting, infrastructure, project management, engineering, and maintenance services. The company is controlled by Kemble Water Limited.

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