ThermoEnergy Corporation, a clean technologies company, develops municipal and industrial wastewater treatment systems, and carbon reducing clean energy technologies worldwide. The company's technologies include Zero Emission Boiler system, which converts fossil fuels and biomass into electricity without producing air emissions, as well as removes and captures carbon dioxide in liquid form for sequestration or beneficial reuse; and Controlled Atmosphere Separation Technology (CAST), R-CAST, and proprietary water technologies. Its technologies also comprise Ammonia Recovery Process technology that captures ammonia from dilute waste streams and converts it into ammonium sulfate; ThermoFuel Process, a renewable energy process, which converts digested or waste activated sewage sludge into an energy fuel that could be converted into electricity for use on-site or sold as a feedstock to third party industrial clients; and Enhanced Biogas Production process, which retrofits existing wastewater treatment plants to recover excess ammonia from the digesters. The company's wastewater treatment systems are used in the aerospace, food and beverage processing, metal finishing, pulp and paper, petrochemical, refining, microchip and circuit board manufacturing, heavy manufacturing, and municipal wastewater applications. Thermoenergy Corporation has a strategic alliance with Contego Systems LLC to provide solutions for airplane deicing. The company was founded in 1988 and is headquartered in Little Rock, Arkansas.

Although The Peoples Natural Gas Company brings the power of natural gas to the people of the Keystone state. The company, which operates as Dominion Peoples, serves about 359,000 commercial, industrial, residential, and transportation natural gas customers in 16 counties in southwestern Pennsylvania. By purchasing methane gas in Pennsylvania, the company keeps costs down by eliminating out-of-state transportation expenses. The gas utility was a division of Dominion Delivery, the gas and electric distribution and retail energy marketing unit of Dominion Resources. In 2010 Dominion Resources sold Peoples Natural Gas to a unit of investment firm SteelRiver Infrastructure.

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.

Trans-Elect has elected itself as a cross-border power company. The independent transmission company owns and operates about 12,600 miles of high-voltage power lines in portions of Canada and the US. The company acts as a wholesale provider of electricity to distribution companies. It operates the former transmission assets of of US utility Consumers Energy; it is also part of an international consortium that operates the former transmission assets of Canadian power distributor TransAlta. The acquisitions were the first of their kind in the deregulating North American electricity market. Trans-Elect is also involved in several expansion projects in congested areas of the US grid.

Severn Trent Services is intent on providing cleaner water for consumers around the globe. The company, a subsidiary of UK-based Severn Trent, provides water and wastewater purification services and products to utilities, bottling companies, and other clients, primarily in the US and the UK. Operations include water filtration and disinfection technologies, contract operations and maintenance, pipeline rehabilitation, and state-of-the-art residential metering products and services. Severn Trent Services' international management services unit supports all aspects of water and wastewater utility management.

Caithness region might well serve as an inspiration for Caithness Corp., which develops wind and other renewable power plants in the US under the Caithness Energy brand. Although the firm has focused on the development, acquisition, operation, and management of geothermal, hydroelectric, wind, and solar energy power projects, it also develops environmentally friendly fossil-fueled plants. Caithness is one of the largest producers of renewable energy in the US, and has developed more than 350 MW of geothermal projects, 160 MW of solar plants, and 440 MW produced by wind turbines. On the cleaner fossil fuel plant side it has also developed more than 2,000 MW of gas-turbine powered capacity.

Southern California Edison (SCE) distributes electricity to a population of more than 13 million people in central, coastal, and Southern California (excluding Los Angeles and some other cities in the regions). The utility's system consists of about 12,000 circuit miles of transmission lines and more than 113,500 circuit miles of distribution lines. SCE also has 5,500 MW of net generating capacity from interests in nuclear, hydroelectric, and fossil-fueled power plants; it sold most of its fossil-fueled facilities in response to the state's deregulation legislation. The utility sells excess power to wholesale customers. SCE is a subsidiary of Edison International.

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.

Empire District Electric (EDE) has the sovereign authority to light up its territory. The utility transmits and distributes electricity to a population base of more than 450,000 (or about 215,000 direct customers) in southwestern Missouri and adjacent areas of Arkansas, Kansas, and Oklahoma. It also supplies water to three Missouri towns and natural gas throughout most of the state. EDE's interests in fossil-fueled and hydroelectric power plants give it a generating capacity of 1,257 MW; it also buys and sells power on the wholesale market. In addition, the company is pursuing nonregulated opportunities such as leasing capacity on its fiber-optic network.

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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