Integrys Energy Group, Inc., through its subsidiaries, operates as a regulated electric and natural gas utility company in the United States and Canada. It provides natural gas utility services in Chicago, Wisconsin, Michigan, and Minnesota. As of December 31, 2009, Integrys Energy Group, Inc. served approximately 1,669,000 residential, commercial and industrial, transportation, and other customers. It had approximately 22,000 miles of natural gas distribution mains; and approximately 1,010 miles of natural gas transmission mains. The company also generates and distributes electric energy form coal, natural gas, fuel oil, hydroelectric, and wind resources in Wisconsin and Michigan. It served approximately 489,000 residential, commercial and industrial, wholesale, and other customers. In addition, Integrys Energy offers nonregulated energy supply and services; and electric transmission services. Integrys Energy Group, Inc. was formerly known as WPS Resources Corporation and changed its name to Integrys Energy Group, Inc. in February 2007. Integrys Energy Group, Inc. was founded in 1883 and is based in Chicago, Illinois.

El Paso Electric Company, a public utility company, engages in the generation, transmission, and distribution of electricity primarily in west Texas and southern New Mexico. It principally operates nuclear, natural gas, and coal power plants, as well as purchases power. The company also operates wind turbines. As of December 31, 2009, it owned 6 electrical generating facilities with a net generating capacity of approximately 1,643 megawatts. The company served approximately 370,000 residential, commercial, industrial, public authority, and wholesale customers. It sells its products to electric utilities and power marketers, as well as to oil, copper refining, and steel production facilities, and the United States military installations. The company was founded in 1901 and is based in El Paso, Texas.

Niska Gas Storage Partners LLC owns and operates natural gas storage assets in North America. It owns or contracts for approximately 185.5 billion cubic feet of total gas storage capacity. Niska Gas Storage Partners LLC owns and operates gas storage facilities in Alberta, Canada, as well as in northern California and Oklahoma, the United States. Its gas storage customers include financial institutions, producers, marketers, power generators, pipelines, and municipalities. The company was founded in 2006 and is headquartered in Houston, Texas.

Manitoba Hydro-Electric (commonly called Manitoba Hydro) provides electricity to 532,000 customers in the province of Manitoba. Its power is generated from hydroelectric facilities capable of producing about 32 billion kilowatt-hours of electricity per year. Manitoba Hydro, which is owned by the government of Manitoba, also exports power to utilities and energy marketers in the US and other Canadian provinces. Through its Centra Gas subsidiary, the company distributes natural gas to 264,000 residential, commercial, and industrial customers in 100 communities in Manitoba.

One of the country's largest water utilities, AWG provides regulated water, wastewater, and environmental services to some 6 million residential, commercial, and industrial customers through its Anglian Water unit. Anglian Water operates primarily in the east of England. The AWG Property unit is engaged in commercial and residential property development AWG's Morrison Facilities Services unit provides a repair and maintenance service to homes and businesses in the UK. AWG was acquired in 2006 by Osprey Acquisitions Limited.

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.

American Transmission Company is an entrepreneur in the US power grid business. Connecting electricity producers to distributors, American Transmission owns, operates, monitors, and maintains 9,400 miles of high-voltage electric transmission lines and 510 substations in portions of Illinois, Michigan, Minnesota, and Wisconsin. American Transmission is one of the first for-profit transmission companies, formed when the US market deregulated in the early 2000s. The company operates the former transmission assets of some of its shareholders. About 30 utilities, municipalities, municipal electric companies, and electric cooperatives in its service area have an ownership stake in American Transmission.

ENVIRON is looking to clean up financially while helping to clean up the environment. An international environmental consulting firm, ENVIRON specializes in assessing risk factors related to the presence of chemicals in the environment and in products such as food, drugs, medical devices, and consumer goods. The consulting firm also helps clients comply with various environmental regulations. The company operates through two practices: environmental sciences and energy services; and health sciences. ENVIRON maintains offices in 18 countries the US, Europe, and the Asia/Pacific region, and has completed projects in more than 70 countries.

Active Power, Inc., together with its subsidiaries, designs, manufactures, and markets critical power quality solutions. It provides various products that deliver continuous clean power, and protects customers from voltage fluctuations, such as surges and sags, and frequency fluctuations, as well as offer temporary power to bridge the gap between a power outage and the restoration of utility power. The company offers CleanSource UPS, a battery free uninterruptible power supply system (UPS) that integrates UPS electronics and flywheel energy storage system into one compact cabinet. Active Power, Inc. also provides CleanSource DC, which is a battery-free replacement option for lead-acid batteries for use in bridging power; CoolAir DC; CoolAir UPS; and GenSTART, which is a battery-free, starting modular system. It offers continuous power systems that comprise UPS system, switchgear, and a generator under the PowerHouse brand name. Active Power, Inc. also provides services, including engineering, installation, start-up, monitoring, and repair for its products. The company serves data centers, manufacturing, technology, broadcast and communications, financial, utilities, healthcare, government, and airport industries. It sells its products through direct sales employees, value added resellers, manufacturers representatives, distributors, strategic IT partners, and original equipment manufacturer partners in the United States, Europe, the Middle East, Africa, the Asia Pacific, and Latin America. The company was founded in 1992 and is headquartered in Austin, Texas.

NORESCO provides utility customers in the US with infrastructure development, design/build services, commissioning strategies, financing, and client-centered asset management services. The company develops and implements build/own/operate distributed generation, cogeneration, or combined heat and power projects; arranges, on a consulting basis, commodity electricity or gas supply; and provides firm contracting of energy supply. It also holds interests in independent power plants. Global leader in HVAC products and systems Carrier, a unit of UTC, owns NORESCO.

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