Nature Group (formerly Nature Technology Solutions) provides wastewater treatment services to the oil, shipping, and offshore industries. Its technologies treat various types of industrial, marine, and oil industry waste streams, including using an environmental-friendly additive that helps remove hydrocarbons in oily wastewater. It helps operate port treatment plants in Gibraltar and Tananger, Norway, and a sewage treatment plant in Gibraltar; it is also involved in decommissioning refineries, installing treatment plants, and treating wastewater on offshore rigs.

OGE Energy is the holding company for the largest electric utility in Oklahoma, but its largest revenue producer is its energy marketing and natural gas transmission unit, OGE Energy Resources. OGE owns Oklahoma Gas and Electric (OG&E), a public utility with almost 777,000 retail and wholesale customers in Oklahoma (including Oklahoma City) and a bit of western Arkansas. OG&E owns coal- and gas-fired power plants that generate 6,420 MW of capacity. Subsidiary Enogex operates 7,900 miles of natural gas gathering and transportation pipeline. The company also provides physical, asset, financial management services through marketing unit OGE Eenergy Resources.

Exelon Corporation company distributes electricity to 5.4 million customers in northern Illinois (including Chicago) and southeastern Pennsylvania (including Philadelphia) through subsidiaries Commonwealth Edison (ComEd) and PECO Energy. PECO also distributes natural gas to 485,000 customers. Subsidiary Exelon Generation holds the company's power plants, whose production capacity is just about 25,000 MW. About two-thirds of Generation's power is nuclear. Exelon Power Team is a top wholesale energy marketer, and Exelon Energy markets retail power and offers other energy-related services.

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.

Warren Rural Electric Cooperative Corporation (Warren RECC) provides its member customers with electricity, security systems, and surge suppression equipment, as well as with floodlighting and street lighting. It offers propane through non-affiliated Propane Energy Partners. The co-op serves more than 55,300 customers in an eight-county service area (Barren, Butler, Edmonson, Grayson, Logan, Ohio, Simpson, and Warren counties) in rural south-central Kentucky. Warren RECC is affiliated with the Tennessee Valley Authority and a member of Touchstone Energy, a 600-member alliance of electricity co-ops.

HELIX Environmental Planning provides services such as biological resources management, construction monitoring, environmental program management, GIS Services, habitat restoration, landscape architecture, natural resource interpretation and public education services, and regulatory compliance reporting. The company operates mainly in California and the southwestern US, but it undertakes projects worldwide and has offices in Australia, Hong Kong, Mexico, the Northern Marianas Islands, Thailand, the US, Venezuela, and Zimbabwe. HELIX Environmental Planning was founded in 1991.

Water is delivered by Mediterranea delle Acque (formed by the early 2006 merger of Italian water utilities Ferrari -- Acquedotto De Ferrari Galliera, Acquedotto Nicolay, Acqua Italia, and Genova Acque. Prior to the merger Acquedotto De Ferrari Galliera delivered about 45 million cubic meters (1.5 billion cubic feet) of water annually to about 350,000 customers. The company is also is involved in firefighting services, electricity sales, and water well-drilling. Rome-based utility AMGA owns 68% of the company.

Artesian Resources Corporation, through its subsidiaries, provides water, wastewater, and engineering services on the Delmarva Peninsula. It distributes and sells water to residential, commercial, industrial, governmental, municipal, and utility customers in the states of Delaware, Maryland, and Pennsylvania. The company also provides water for public and private fire protection to customers in its service territories. In addition, it designs and builds water and wastewater infrastructure; and provides contract water, wastewater, and engineering services. As of December 31, 2009, the company had approximately 76,900 metered customers and 730 wastewater customers, and served a population of approximately 276,000. It served customers through approximately 1,124 miles of transmission and distribution mains. The company was founded in 1905 and is headquartered in Newark, Delaware.

"Hey Culligan Man!" To be sure, the phrase made famous by an ad campaign still rings in the ears of Culligan International workers. Formerly a subsidiary of Veolia Environnement, Culligan produces filters for tap water, household water softeners, microfiltration products, desalination systems, and portable deionization services for commercial and industrial users. The franchised "Culligan Man" noted in the advertising phrase delivers bottled water and water systems to consumers and businesses through more than 800 Culligan company-owned and franchised dealers in more than 90 countries. Buyout firm Clayton, Dubilier & Rice owns the company.

Los Angeles Department of Water and Power (LADWP) keeps the movie cameras running and the swimming pools full. The largest municipally owned utility in the US, LADWP provides electricity to more than 1.4 million residential and business customers and water to 640,000 customers. The company has power plant interests that give it more than 7,220 MW of generating capacity; it also buys and sells wholesale power. Most of the city's water supply is transported through two aqueduct systems from the Sierra Nevada Mountains; other water sources include wells and local groundwater basins. Because LADWP is city-owned, its retail monopoly status was unaffected by utility deregulation in California.

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