Through its regulated utility subsidiaries, Aquarion distributes water to more than 180,000 homes and businesses (or about 580,000 people) in some 39 communities in Connecticut, Massachusetts, and New Hampshire. It is one of the 10 largest investor-owned utilities in the US. The company's Aquarion Services unit provides contract management of municipal water and wastewater systems, along with engineering and management consulting services and consumer water line protection plans. In 2007 UK-based Kelda Group sold control of Aquarion to Australia's Macquarie Bank for $860 million.

Emera is an emerging force in a new energy era. Subsidiary Nova Scotia Power Inc. (NSPI) generates, transmits, and distributes more than 97% of the electricity in Nova Scotia, where it serves 486,000 residential, commercial, and industrial customers. Most of NSPI's more than 2,290 MW generating capacity is from fossil fuel plants. Emera has electric utility operations into the US through its Maine-based Bangor Hydro-Electric, which serves about 117,000 customers. It markets wholesale energy and provides asset management services. Emera owns Brunswick Pipeline (which ships LNGs), and has a minority stake in Maritimes & Northeast Pipeline (natural gas). It also has minority stakes in utilities in the Caribbean.

Energy and Power Solutions (EPS) would like to help. The start up company, which promises up to a 25% energy savings using its methods, makes most of its money building on-site clean energy power plants. It also sells electrical and thermal power and operates power plants on behalf of its customers. But EPS touts its xChange Point energy monitoring software as the growth engine of the future. The software tracks energy use at the device, plant, and enterprise level in real time; EPS analysts use the data to recommend energy saving changes. The company, which filed to go public in 2010, has four customers using its products at more than 60 locations.

Buckeye Power was established by Ohio's rural electric co-ops to produce and transmit electric power for member systems throughout the state. Buckeye Power, which owns two of the three generating units in the at Cardinal Generating Station, contracts with other Ohio electric companies to use their transmission systems to transmit power to its member electric distribution cooperatives.It has cost a few bucks to generate power, but the effort has been well worth it for Buckeye Power, an electricity generation and transmission cooperative that provides electricity to 24 distribution companies in Ohio and one in Michigan. Together they serve more than 390,000 homes and businesses in 77 of Ohio's 88 counties

Thermal Energy International ledgers are in the black. The company focuses on providing air pollution control, renewable energy, and waste heat recovery and other energy conservation products, primarily under the Flu-Ace and Dry-Rex names. It also offers complementary engineering services. Thermal Energy International is also developing a product that targets ozone generation, THERMALOZOMAX. Customers include auto manufacturers; coal-fired utilities; food makers; hospitals; primary metal, pulp and paper processors; and sewage-treatment facilities.

Southern Nuclear Operating company, a subsidiary of Southern Company since 1990, operates six nuclear power units at three plant locations, which combined, provide about 20% of the electricity used in Alabama and Georgia. Southern Nuclear's Joseph M. Farley Nuclear Plant began commercial operation in 1977. The Edwin I. Hatch Nuclear Plant and the Alvin W. Vogtle Electric Generating Plant are jointly owned by Southern Company's Georgia Power (50%), Oglethorpe Power (30%), the Municipal Electrical Authority of Georgia (18%), and the city of Dalton.

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.

PPL packs a powerful punch in Pennsylvania, Kentucky and the UK, where it distributes electricity to 5.2 million customers through regulated subsidiaries PPL Electric Utilities (1.4 million customers), two utilities in Kentucky (1.2 million), and Western Power Distribution Holdings (2.6 million electricity customers). The company has 19,000 MW of generating capacity and also sells energy wholesale in key US markets. Once a global power player with interests in distribution companies worldwide, the company has opted for the UK as its non-US focus. Western Power Distribution operates two of the 15 distribution networks providing electricity service in the UK -- WPD (South West) and WPD (South Wales).

CLP Holdings Limited, through its subsidiaries, engages in the generation, supply, transmission, and distribution of electricity in Hong Kong, Australia, and India. The company also invests in various power projects located in the Chinese mainland, southeast Asia, and Taiwan. It invests in various power generating assets, including nuclear, pumped storage, coal-red, hydro, wind, and biomass. In addition, the company engages in the provision of engineering services; retail of electricity and gas; and storage of gas. As of December 31, 2009, it generated 6,908 megawatts of electricity; had interests in approximately 13,000 kilometers of transmission and high voltage distribution lines; and served 2.3 million customers. The company was founded in 1901 and is based in Kowloon, Hong Kong.

ITC Holdings Corp. (NYSE: ITC) invests in the electricity transmission grid to improve electric reliability, expand access to markets, lower the overall cost of delivered energy and allow new generating resources to interconnect to its transmission systems. The largest independent electricity transmission company in the country, ITC operates high-voltage transmission systems in Michigan’s Lower Peninsula and portions of Iowa, Minnesota, Illinois, Missouri and Kansas, serving a combined peak load in excess of 25,000 megawatts through its regulated operating subsidiaries, ITCTransmission, Michigan Electric Transmission Company (METC), ITC Midwest and ITC Great Plains. ITC also focuses on new areas where significant transmission system improvements are needed through ITC Grid Development and its subsidiaries.

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