Connecticut Water Service, Inc., through its subsidiaries, operates as a regulated water company in Connecticut. It operates in three segments: Water Activities, Real Estate Transactions, and Services and Rentals. The Water Activities segment supplies drinking water. The Real Estate Transactions segment involves in the sale or donation of its real estate holdings. The Services and Rentals segment provides contracted services to water and wastewater utilities and other clients, which include contract operations of water and wastewater facilities; Linebacker, an optional service line protection program that comprises repairing or replacing leaking or broken water service line, curb box, curb box cover, meter pit, meter pit cover, meter pit valve, and in-home water main shut off valve before the meter; and providing bulk deliveries of emergency drinking water to businesses and residences through tanker trucks. This segment also engages in leasing and renting residential and commercial properties. As of December 31, 2009, Connecticut Water Service, Inc. served 88,534 customers in 54 towns in Connecticut. The company was founded in 1956 and is headquartered in Clinton, Connecticut.

Puerto Rico Electric Power Authority (PREPA) is prepared to serve an entire island nation. Founded in 1941, the government-owned utility is the sole electricity distributor for Puerto Rico, where it serves approximately 1.4 million residential and business customers. PREPA owns five primarily fossil-fueled power plants that give it nearly 5,800 MW of generating capacity, and it has more than 30,000 miles of transmission and distribution lines. In order to keep up with increasing demand, the Puerto Rican government has allowed independent power producers to build cogeneration plants on the island to sell power to PREPA.

Piedmont Natural Gas Company, Inc., an energy services company, distributes natural gas to residential, commercial, industrial, and power generation customers in portions of North Carolina, South Carolina, and Tennessee. It also operates various energy-related businesses, including unregulated retail natural gas marketing, interstate natural gas storage, and intrastate natural gas transportation. As of October 31, 2009, the company served 952,469 retail customers and 61,000 customers served by municipalities. Piedmont Natural Gas Company, Inc. was founded in 1949 and is headquartered in Charlotte, North Carolina.

Public Utility District No. 1 of Cowlitz County, Washington (or Cowlitz County Public Utility District), a Depression era institution that provides electric utility services to 47,400 customers (including 42,400 residential customers and 5,200 commercial clients) in its service territory. The municipal utility also serves more than 3,800 Longview-Kelso area water utility customers. Like 27 other PUDs in Washington state, Cowlitz County Public Utility District has the authority to offer electric, water, wastewater, and wholesale telecommunication service.

Avista Corporation, an energy company, engages in the generation, transmission, and distribution of energy and energy-related businesses in the United States and Canada. The company operates through two segments, Avista Utilities and Advantage IQ. The Avista Utilities segment engages in the generation, transmission, and distribution of electric energy primarily from hydroelectric and thermal sources. This segment also distributes natural gas to retail customers in parts of eastern Washington, northern Idaho, and parts of northeast and southwest Oregon, as well as engages in wholesale purchase and sale of electricity and natural gas. As of December 31, 2009, it provided retail electric service to approximately 356,000 customers; and retail natural gas service to approximately 316,000 customers. This segment offers electricity and natural gas to residential, commercial, and industrial customers. The Advantage IQ segment provides utility expense management solutions to assess and manage utility costs and usage to multi-site companies in North America. It offers invoice processing, auditing and payment services, energy procurement, reporting, and advanced analysis, as well as provides analytical support, reporting, and consulting services. In addition, Avista’s other investments and operations include sheet metal fabrication of electronic enclosures, parts, and systems for the computer, telecom, renewable energy, and medical industries; real estate investments, primarily commercial office buildings; and investments in venture capital funds and low income housing. The company was founded in 1889 and is headquartered in Spokane, Washington.

Cobb Electric Membership Corporation (Cobb EMC) makes sure that Cobb County, Georgia residents can cook corn on the cob (and anything else) using electric power and natural gas. The utility distributes electricity to about 196,000 residential, commercial, and industrial customers in Cobb County and four other north metro Atlanta counties. Cobb EMC operates about 10,400 miles of power lines. Its Cobb Energy Management unit is a for-profit affiliate that provides administrative and labor services to Cobb EMC and offers phone, Internet, and natural gas options for Cobb EMC's customers primarily through subsidiaries.

Middlesex Water Company, together with its subsidiaries, owns and operates regulated water utility and wastewater systems in New Jersey, Delaware, and Pennsylvania. It engages in collecting, treating, distributing, and selling water for domestic, commercial, municipal, industrial, and fire protection purposes. The company also operates water and wastewater systems under contract on behalf of municipal and private clients, as well as provides water, water treatment, pumping services, and wastewater services. In addition, it offers a water service line, as well as various maintenance programs that cover parts, materials, and labor required to repair or replace specific elements of the customer’s water service lines, and customer shut-off valve and/or sewer lateral in the event of a failure. As of December 31, 2009, the company served approximately 59,800 retail customers primarily in eastern Middlesex County; 300 customers in Cumberland County; 10,500 customers in Perth Amboy; and 2,500 residential customers in Burlington County, New Jersey. It also served approximately 33,200 retail customers in New Castle, Kent, and Sussex Counties in Delaware, as well as offered wastewater services to approximately 1,900 residential retail customers in Delaware. The company was founded in 1897 and is headquartered in Iselin, New Jersey.

CHOICE! Energy Services and Texas Energy Services divisions the company provides consulting and price comparison services to retail customers. CHOICE! Energy Services also provides commodity brokerage and consulting services to energy producers and marketers, utilities, banks, and other corporations. Customers include BP and Morgan Stanley. President and CEO Javier Loya formed CHOICE! Energy in 1994.

New York Independent System Operator (New York ISO). The company, which replaced the New York Power Pool, manages and monitors wholesale activities on the state's transmission grid, which consists of some 11,000 miles of high-voltage lines. The New York ISO is charged with providing fair access to the state's competitive wholesale power market (37,400 MW of generating capacity), while ensuring the reliable, efficient, and safe delivery of power to New York's more than 19 million residents. The not-for-profit company is governed by a 10-person board of directors.

ReliOn relies on its ability to produce hydrogen fuel cells in order to make money. The company claims to be the world's leading developer and marketer of modular, cartridge-based, proton exchange membrane fuel cell technology. ReliOn markets a range of stationary fuel cells for emergency and back up power systems, uninterruptible power supplies, digital power needs and a range of off grid power requirements. The company has sold and installed more than 2 MW of products with private and public entities in the energy, telecommunications, and transportation segments. Investors include Avista, Enterprise Partners Venture Capital, and Wall Street Technology Partners.

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