EcoWater Systems is in a pristine spot. The company manufactures commercial and residential water treatment systems. It sells its products through a network of more than 1,400 dealers, wholesalers, and private-label retailers. Products include water refiners, conditioners, and purifiers, and innovations such as reverse osmosis drinking water systems. Founded in 1925, EcoWater Systems is a member of Berkshire Hathaway's Marmon Group and maintains its autonomous management. In addition to the US, the company operates in Canada, the UK, Europe, and China.

Northeast Utilities (NU) uses a little Yankee ingenuity (and a number of power generation plants) to keep its customers powered up. The largest utility in New England, NU supplies power to more than 2 million customers in Connecticut, New Hampshire, and Massachusetts through subsidiaries Connecticut Light and Power, Public Service Company of New Hampshire, and Western Massachusetts Electric. The company's power grid encompasses more than 3,100 circuit miles of overhead transmission lines and more than 32,800 pole miles of distribution lines. NU's Yankee Gas utility provides natural gas to 205,000 customers in Connecticut. In 2010 the company offered to buy regional rival NSTAR in for $4.2 billion.

UIL Holdings, parent of electric utility The United Illuminating Company (UI), hopes its well regulated business will result in regular revenue growth. The public utility distributes electricity to 325,000 customers in southwestern Connecticut. Its service area, largely urban and suburban, includes the principal cities of Bridgeport (population 137,000) and New Haven (population 124,000) and their surrounding areas. UIL Holdings has teamed up with NRG Energy to form GenConn Energy LLC, a joint venture that focuses on developing new power generation facilities in Connecticut. In 2010 the company acquired three gas utilies in New England from IBERDROLA USA for $1.3 billion.

EVN spreads energy evenly across its territory in Lower Austria and beyond. The utility -- one of Austria's largest -- provides electricity, natural gas, heat, and related services. Outside its home borders, the company has gained control of electricity suppliers in Bulgaria and Macedonia, as these countries privatized their electricity industry. It is also marketing its environmental services (water, wastewater treatment, and waste incineration activities) around Europe. The company has built drinking water and wastewater treatment plants in Croatia, Poland, and Russia EVN has also put its waste-incineration know-how to good use and has a waste-to-energy plant in Moscow.

Rayburn Country Electric Cooperative (Rayburn Electric) operates in the old stomping grounds of the legendary Texas politician and former speaker of the US House of Representatives. Rayburn Electric is a power generation and transmission organization that supplies wholesale power to five rural distribution cooperatives operating in 16 counties in north central and northeastern Texas. The five distribution cooperatives (Fannin County Electric Coop, FEC Electric Coop, Grayson-Collin Electric Coop, Lamar County Electric Coop, and Trinity Valley Electric Coop) collectively own the company. In 2010 it acquired a 25% stake in a Texas power plant from Calpine for $215 million.

Trojan Technologies wants to zap you. The company manufactures ultraviolet (UV) lighting systems for disinfecting wastewater and treating contaminated soil and groundwater. Trojan's wastewater treatment systems are used in about 4,000 municipalities in 50-plus countries. The company's UV light systems work by altering the DNA in microorganisms and are an alternative to traditional chlorine-based disinfection systems. Trojan also makes UV products that cleanse water used in industrial processes such as food production and electronics manufacturing. Other products include residential UV systems for drinking water. Danaher controls Trojan.

Alkane Energy pursues the arcane task of extracting methane gas from abandoned coal mines in the UK and Germany for the dual purposes of direct supply to industrial clients and for on-site power generation. A renewable energy company, Alkane aims to reduce greenhouse gas emissions, through the capturing of coalbed methane and its conversion to energy. The company designs, builds, and services containerized methane treatment plants and electricity generation facilities that use biogas, landfill gas, sewage gas, and coal mine methane. Alskane operates seven biogas-to-electricity sites in the UK and one in Germany.

Privatization is the light at the end of the tunnel for Companhia Energetica de Sao Paulo, one of Brazil's largest power generators. Known as CESP, the company is the largest generator of electricity used in the Brazilian state of Sao Paulo. CESP's six hydroelectric facilities (57 generation units) have a capacity of more than 7,456 MW. It gets most of its revenues from distribution utilities. Sao Paulo state government-controlled CESP previously had 22 power plants, but it spun off two generating companies and a transmission company in 1999. The slimmer CESP was targeted for auction, but the state government postponed the sale. CESP is restructuring its debt and is focusing on operational efficiency.

Founded in 2001 by partners David Hernandez, Eliezer Hernandez and Alberto Daire, Liberty Power has grown to serve tens of thousands of customers including small and mid–sized businesses, large Fortune 500 accounts, and government entities on a national level.

Centrais Eletricas Brasileiras S.A. – Eletrobras primarily engages in the generation, distribution, transmission, and commercialization of electric power; and construction and operation of nuclear power plants in Brazil. The company also assists Brazil's Ministry of Mining and Energy in designing the country's policy for the energy sector; provides guarantees and acquires debentures of companies and holders of public electric power services; grants loans and guarantees for technical and scientific research institutions; promotes and supports research in the power sector in connection with the generation, transmission, and distribution of electric power, as well as studies involving the exploitation of watershed for various purposes; contributes to the education of technical staff and qualified workers required by the Brazilian electric power sector through specialized training programs or assists national educational institutions or provides scholarships or signs agreements with foreign institutions that promote the development of specialized technical personnel; and co- operates technically and administratively with companies in which it holds interests, and with the agency of the Ministry of Mining and Energy. In addition, it manages incentive program for alternative sources of electric power, a program of the federal government that aims to enhance the diversification of the Brazilian energy model and search for regional solutions based on renewable electric power sources produced by independent agents. The company is headquartered in Rio de Janeiro, Brazil.

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