Making money by water, Biwater provides water and wastewater treatment services to a range of customers in more than 90 countries. The company also offers water infrastructure investment, consultancy and operation; water asset management; and project management for water leisure facilities. Its Biwater Leisure unit has installed several Olympic-sized pools for almost 40 years. Its international projects include the design and installation of a wastewater treatment plant in Dubai, and a water distribution system for 4.2 million customers in Malaysia. Biwater also designs and builds desalination plants. Focusing on international growth, in 2010 it sold its UK-based Biwater Services Limited unit to MWH Global.

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.

Huntsville, Alabama residents don't have to hunt far to find gas, power, and water. Government's utility City of Huntsville Electric, Natural Gas and Water Systems provides all of these resources. Known as Huntsville Utilities, the company distributes electricity to more than 156.000 residential, commercial, and industrial customers in the city and surrounding areas; it also provides natural gas to 46,200 customers and water services to more than 82,000 customers. Huntsville Utilities buys electricity from the Tennessee Valley Authority. The utility's gas comes from Gulf of Mexico suppliers, and its water is pumped from underground aquifers and the Tennessee River.

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.

TestAmerica Laboratories (formerly Severn Trent Laboratories) can tell you. It operates about 40 environmental testing laboratories and more than 30 service centers in the US. TestAmerica provides chemical, physical, and biological testing of air, drinking water, tissue, and solid waste. The company has developed technologies to test air for fire retardants, explosives, radiation, and source emissions. Its affiliates include environmental and geotechnical drilling firm TestAmerica Drilling, water sampling equipment and remediation pumping system provider QED Environmental Systems, and air quality analyst EMLab P&K).

Otter Tail covers a swath of businesses, from electric services and food-ingredient processing to manufacturing equipment, plastics, and health services. Its electric utility and energy activities are subsidiaries of Otter Tail, and its subsidiary Varistar holds Otter Tail's other interests. The electric utility has been the company's core effort since Otter Tail's start in 1907; it keeps the lights on for 129,000-plus residential, commercial, and industrial customers in Minnesota and the Dakotas. Otter Tail also makes PVC pipes, wind towers, metal parts, and processes potato flakes, as well as offers diagnostic medical equipment, and construction and trucking services.

Associated Electric Cooperative makes the connection between power and cooperatives. The utility provides transmission and generation services to its six member/owner companies, which in turn provide power supply services to 51 distribution cooperatives in three Midwest states. (The distribution cooperatives have a combined customer count of more than 875,000.) Associated Electric operates 9,520 miles of power transmission lines and has about 5,240 MW of generating capacity from interests in primarily coal- and gas-fired power plants and from wholesale energy transactions with other regional utilities.

PNM Resources, Inc. company's primary utility unit, Public Service Company of New Mexico, distributes electricity to nearly 500,000 residential, commercial, and industrial customers in the state. PNM Resources operates power plants with more than 2,700 MW of generating capacity and markets energy to wholesale customers in the western US. Its Texas-New Mexico Power Company (TNMP) unit provides transmission and distribution services at regulated rates to about retail electricity providers that, in turn, provide retail electric service to 230,000 end users. Subsidiary First Choice Power is a retail electric provider operating in Texas and serving 234,000 customers.

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.

Terasen Gas is the largest natural gas distribution company in British Columbia. A Fortis subsidiary, it is the third-largest gas utility in Canada and the largest natural gas distributor in the Pacific Northwest. The utility serves 940,000 residential, commercial, and industrial customers in 125 communities in BC. Terasen Gas also provides gas transportation services to wholesale customers, operates a liquefied natural gas (LNG) plant, and pipes propane products to select areas of the province. Terasen Gas serves mainland British Columbia;Terasen Gas (Vancouver Island) serves Vancouver Island, the Powell River and the Sunshine Coast; and Terasen Gas (Whistler) provides natural gas to the town of Whistler.

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