Caithness region might well serve as an inspiration for 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.

"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.

Public Utility District No. 1 of Clark County (Clark Public Utilities) provides utility services to residents and businesses in Clark County, Washington. Clark Public Utilities transmits and distributes electricity to more than 182,000 customers; the company generates about half of its power supply at its 250-MW gas-fired power plant and purchases the rest from other generators, including the Bonneville Power Administration. Clark Public Utilities also distributes water to about 30,000 customers and collects and treats wastewater for the City of La Center, Washington.

Calvalley Petroleum searches below the plateau for fuel for its customers. The company focuses on exploring for and producing oil and natural gas at Block 9 in the Republic of Yemen. The company, which has about 16 working wells (more than 50 have been drilled), produces some 5,000 barrels of oil each day. Its subsidiary Calvalley Petroleum (Cyprus) Ltd. is the operator of the property, which includes about 552,000 acres of land in the Sayun-Masila basin. Calvalley Petroleum has a net proved plus probable reserves of 7.8 billion barrels of oil equivalent.

Staying true to its more-than-a-century-old watery origins, Turlock Irrigation District (TID) provides irrigation services to almost 6,000 farmers in its service area (150,000 acres of farmland). The company also provides electric generation, transmission, and distribution services to more than 98,000 retail customers in and around Turlock, California, and it sells power to wholesale customers. TID became a generator and distributor of electricity in 1923. The district provides electric service to its customer base in a 662-sq.-ml. service area encompassing portions of Merced, Stanislaus, and Tuolumne counties.

BKW FMB Energy has been lighting up the lives of the Swiss for more than a century. BKW produces, transmits, and distributes energy to more than 1 million residential and business end users in Switzerland and neighboring countries. The company also trades in energy. BKW operates about 13 hydroelectric plants and one nuclear power plant; it has stakes in another 15 hydroelectric plants, three nuclear power plants, and two plants that generate electricity from wind, solar and biomass sources. The total generating capacity of its plants is 640 MW. The government of the canton of Bern owns more than half of BKW.

GDF SUEZ Energy North America (GDF-SENA) manages GDF Suez Energy International's energy business in Canada, Mexico, and the US. The company develops and operates electricity and cogeneration facilities, markets and sells energy products and services, and imports and distributes natural gas and liquefied natural gas (LNG). It serves both commercial and industrial customers. (GDF-SENA)'s primary unit (GDF SUEZ Energy Generation NA) owns and operates 60 power, cogeneration, steam, and chilled-water facilities, including those in construction, representing a capacity of 7,500 MW of electricity generation, 6 million pounds per hour of steam, and 42,000 tons per hour of chilled water.

Sutton and East Surrey Water supplies water in southern England. The regulated utility distributes water to about 252,000 residential customers and some 18,000 businesses, (a population about 650,000 people), in the London boroughs of Croydon, Merton, and Sutton, as well as East Surrey and parts of Kent and Sussex. Formerly a subsidiary of East Surrey Holdings, the company was acquired by private equity firm Terra Firma Capital Partners in 2005 when Terra Firma was required to buy the parent company in order to obtain gas company Phoenix Natural Gas. Terra Firma quickly sold the water utility to a fund of Germany's Deutsche Bank.

ThermoEnergy Corporation, a clean technologies company, develops municipal and industrial wastewater treatment systems, and carbon reducing clean energy technologies worldwide. The company's technologies include Zero Emission Boiler system, which converts fossil fuels and biomass into electricity without producing air emissions, as well as removes and captures carbon dioxide in liquid form for sequestration or beneficial reuse; and Controlled Atmosphere Separation Technology (CAST), R-CAST, and proprietary water technologies. Its technologies also comprise Ammonia Recovery Process technology that captures ammonia from dilute waste streams and converts it into ammonium sulfate; ThermoFuel Process, a renewable energy process, which converts digested or waste activated sewage sludge into an energy fuel that could be converted into electricity for use on-site or sold as a feedstock to third party industrial clients; and Enhanced Biogas Production process, which retrofits existing wastewater treatment plants to recover excess ammonia from the digesters. The company's wastewater treatment systems are used in the aerospace, food and beverage processing, metal finishing, pulp and paper, petrochemical, refining, microchip and circuit board manufacturing, heavy manufacturing, and municipal wastewater applications. Thermoenergy Corporation has a strategic alliance with Contego Systems LLC to provide solutions for airplane deicing. The company was founded in 1988 and is headquartered in Little Rock, Arkansas.

The main tenet of TenneT's business is to keep the Dutch national power transmission grid running smoothly across the nation's high-voltage power lines, constantly balancing supply with demand. The state-owned company also provides inspection and maintenance services for the infrastructure. TenneT manages more than 2,040 miles of high-voltage transmission lines and more than 50 electrical substations. Subsidiary APX manages non-contracted wholesale energy transactions. In 2010 TenneT spent $1.1 billion to buy grid operator transpower from E.ON. In 2010 a TenneT and National Grid joint venture began laying the first section of a high-voltage cable to connect the power grids in the Netherlands and the UK.

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