Constellation Energy Group, Inc., through its subsidiaries, supplies energy products and services in North America. The company operates in three segments: Merchant Energy, Regulated Electric, and Regulated Gas. The Merchant Energy segment owns, operates, and maintains fossil, nuclear, and renewable generating facilities, and holds interests in nuclear generating facilities, qualifying facilities, and power projects. It also provides operation and maintenance services, including testing and start-up, to owners of electric generating facilities. In addition, this segment offers products and services to meet the energy requirements of wholesale and retail customers, including distribution utilities, cooperatives, aggregators, and commercial, industrial, and governmental customers. As of December 31, 2009, it had a total generation capacity of 7,118 megawatts. The Regulated Electric segment purchases, transmits, distributes, and sells electricity in central Maryland. It maintained approximately 240 substations, 1,300 circuit miles of transmission lines, and 24,500 circuit miles of distribution lines. The Regulated Gas segment purchases, transports, and sells natural gas in central Maryland. Constellation Energy Group also designs, constructs, and operates renewable energy, heating, cooling, and cogeneration facilities; offers energy performance contracting and energy efficiency engineering services; provides home improvements, service electric and gas appliances, service heating, air conditioning, plumbing, electrical, and indoor air quality systems, as well as offers natural gas marketing to residential customers in central Maryland; and develops and deploys new nuclear plants in North America through its joint venture. The company was founded in 1906 and is based in Baltimore, Maryland.

Tokyo Gas Co. is Japan's #1 gas co. Tokyo Gas Co., Ltd. produces and distributes natural gas to nearly 10 million households in Japan's Kanto region, which encompasses Tokyo and the surrounding area. Its gas pipeline network exceeds 50,000 kms. The company also provides district heating and cooling, operates LNG (liquefied natural gas) tankers and terminals, manages real estate properties, provides utility construction services, develops and sells gas appliances, and distributes gas in Malaysia. Tokyo Gas imports LNG and is participating in upstream development projects. To help pay down debt related its purchase of Union Fenosa in 2009 Gas Natural sold power assets in Mexico to Tokyo Gas and Mitsui for $1.2 billion.

Southern Maryland gets it power via the South Maryland Electric Cooperative (SMECO), which distributes electricity to more than 147,000 residential, commercial, and industrial customers in four counties. One of the ten largest electric cooperatives in the US, the member-owned enterprise gets its wholesale power supply through its membership in ACES Power Marketing. SMECO's service area includes all of Calvert and St. Mary's counties, and parts of of Calvert and Prince George's counties. Cities covered include Hughesville, Leonardtown, Prince Frederick, and White Plains.

The state-owned utility has 1,480 MW of generating capacity from hydroelectric and fossil-fueled power plants and operates a 2,000-mile transmission system. Grand River Dam Authority also manages two lakes.It took the dam authority of the State of Oklahoma to create the body that would dam the Grand River. The resulting power provider, the Grand River Dam Authority, is responsible for supplying wholesale electricity to municipal and cooperative utilities and industrial customers in its service territory, which encompasses 24 counties in northeastern Oklahoma.

Utilities' formula for success is H-2-O. As one of the largest privately owned water and wastewater companies in the US, Utilities owns about 90 subsidiaries that operate more than 500 systems in 15 states, mainly east of the Mississippi. The company serves more than 300,000 customers. About half of the company's revenues come from water services and the other half from wastewater services; residential customers account for approximately 90% of sales. Utilities also provides reuse water for irrigation purposes and for golf courses and car washes. Expanding its coverage, in 2009 the company acquired the sewer collection system assets of Sewerage District No. 6 in Louisiana.

RMT furnishes environmental engineering and consulting services to businesses that want to keep it clean. The company's services include solid waste management, liability reduction and remediation, air quality management, employee health and safety management, construction contracting, energy and alternative energy management, wastewater treatment, and data management services. RMT serves customers in the cement, chemicals, solid waste, electricity, forest products, metals, oil and gas, and textiles industries. Part of Alliant Energy's Integrated Services division, RMT operates 12 US offices with single locations in France and the UK.

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.

Infiltrator Systems is not connected to The Spy Who Came In From The Cold, spy satellites, or any other relic of Cold War espionage. The company is the world's leading maker of plastic leachfield products used to handle commercial and residential wastewater. Infiltrator Systems' leachfield drainage chambers are a direct and cost-effective replacement for stone and pipe leachfields, and create a footprint only half the size of traditional leachfields. The products, which are made at facilities in Kentucky and Utah, are sold throughout the US. The company estimates that one in four septic systems in the US uses Infiltrator Systems' products.

GenOn Energy, Inc. operates as a generator of wholesale electricity in the United States. Its portfolio of power generation facilities include baseload, intermediate, and peaking units using coal, natural gas, and oil to generate electricity. The company owns, contracts, or operates approximately 49 power generation stations with generation capacity of 24,599 megawatts. The company was formerly known as Mirant Corporation and changed its name to GenOn Energy, Inc. on December 4, 2010. The company is based in Houston, Texas.

Bournemouth and West Hampshire Water supplies water distribution and treatment services to commercial and residential customers. It serves a population of 436,300 in an area encompassing some 1,040 square kilometers. It operates 50 sites and has a 2,755-km network of water mains. The company also has nonregulated operations, including Aqua Care, which provides plumbing services and home emergency insurance. The utility is owned by Cascal BV, which itself is owned by UK water and wastewater treatment provider Biwater. The company was formed by the 1994 amalgamation of Bournemouth & District Water Co. and West Hampshire Water Co.

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