Wahlco likes to keep it clean. It designs and manufactures air pollution control equipment, specializing in ammonia handling, flue gas conditioning, nitrogen oxide control equipment which it installs at power plants and other industrial facilities, including cement plants, oil and gas refineries, pulp and paper mills, and steel mills. Wahlco also makes products such as low-watt density heaters and specialty thermocouples for industrial applications. The company's systems and equipment can be found in more than 500 locations in more than 17 countries. Wahlco was founded by a small group of experts in 1972.

Snam Rete Gas (formerly Snam S.p.A.) transmits natural gas across Italy, managing a network of about 19,300 miles of transmission pipeline. The network includes eight regional centers, 55 local management centers, and 11 compressor stations, and transports more than 83 billion cubic meters of natural gas a year. The company is also the only liquefied natural gas (LNG) regasification and storage services provider in Italy (operating through subsidiary GNL Italia). Energy behemoth Eni controls Snam Rete Gas, which was formed in 2001. In 2009 Eni consolidated its gas units, and sold its Italgas gas distributor and its Stogit gas storage unit to Snam Rete.

Public Utility District No. 1 of Chelan County, Washington (or Chelan County PUD) provides power and water to residents of the county located in the middle of the Evergreen State. The utility operates three hydroelectric-generation facilities on or near the Columbia River that have a combined capacity of about 2,000 MW. About 30% of the district's electricity goes to its more than 47,000 residential, commercial, and industrial customers; the rest is sold wholesale to other utilities operating in the northwestern US. Chelan County PUD also provides water and wastewater services to about 5,700 customers.

Modesty notwithstanding, Modesto Irrigation District (MID) does much more than irrigate 59,000 acres of land in the Modesto, California area. The state-owned utility also generates, transmits, and distributes electricity to more than 91,270 residential and about 12,700 commercial and industrial customers; markets wholesale power; and treats and provides drinking water to the city of Modesto for distribution purposes. The company is a not-for-profit organization formed by the government of Stanislaus County in 1887 to provide irrigation services in the Modesto region.

United Water International, founded in 1995, is one of the largest water utility companies operating in towns and cities in both Australia and New Zealand (including major centers such as Adelaide, Ballarat, and Auckland). United Water International operates and maintains water and wastewater treatment plants as well as customer call centers. All told, the company serves somewhere in the neighborhood of 1.5 million customers. United Water International is owned by Halliburton unit KBR, and Veolia Environnement.

Sociedad General de Aguas de Barcelona, S.A. (Agbar) distributes water to more than 12 million people (almost 19 million during tourist season) and provides wastewater services for more than 6.2 million people. The company also has stakes in water businesses in Chile and the UK. Agbar has sold its solid-waste collection and treatment operations in order to focus on its core water business. Activities in Spain account for about 83% of the company's sales. Agbar is 66%-owned by Holding de Infraestructuras y Servicios Urbanos S.A.

Veolia Environnement holds water -- as well as waste management, energy, and transportation -- operations. The company's Veolia Eau unit, which provides water and wastewater services to more than 80 million people in more than 60 countries, is the world's largest water company, ahead of SUEZ Environnement. Veolia Environmental Services, one of the world's leading waste management companies, serves more than 70 million people a year. Majority-owned energy unit Dalkia (Veolia Energy Services) operates global cogeneration facilities and heating and cooling systems, and Veolia Transport (formerly Connex) is a top European provider of bus, light-rail, and rail transport and operates in about 30 countries.

Down by the riverside there's power, and City of Riverside, California, Electric Utility (which does business as Riverside Public Utilities) distributes it to more than 105,000 residential, commercial, and industrial customers and water to more than 63,000 customers in Riverside, California. The municipal electric utility has interests in power plants (partly through its membership in the Southern California Public Power Authority), and it buys and sells wholesale power. City of Riverside, California, Electric Utility also owns water wells and treatment facilities.

Southern Californians soak up the sun, and the energy. The latter is where Southern California Public Power Authority comes in. The power authority generates and transmits electricity for 10 municipal distribution utilities and one irrigation district in southwestern California. Members include the municipal utilities of the cities Anaheim, Burbank, Colton, Glendale, Los Angeles, Pasadena, and Riverside. The authority has interests in three power plants and three transmission projects in the western US. It is constructing a fourth generation project. Southern California Public Power Authority also provides legislative representation and cost efficiency services to its members.

Global Water Resources (GWRI) took the phrase "Think globally, act locally" to heart. The company provides water, wastewater, and recycled water utility services to 14 utilities and more than 60,000 people in its service area around Phoenix. Its recycled water is treated and purified wastewater used for non-potable and outdoor purposes, sent through a separate system of pipes than drinking water. GWRI says its reclaimed water project saves up to 40% of drought-prone Arizona's scarce groundwater. The utility also extends water and wastewater infrastructure financing to regional developers and builders. The company was formed in 2003. Once privately held, GWRI went public in an IPO in late 2010.

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