FERSA Energias Renovables has found being green isn't too difficult. The Spanish holding company invests in and operates companies that produce electricity utilizing such renewable energy resources as wind power, solar energy, and biomass. The company's holdings span the European continent with investments in wind farms in Spain, Estonia, and Italy as well as holdings in Panama, India, and China. Holdings include Eolica el Pedregoso, Elolica de Pino, Parque Eolico Hinojal, Enrilews, and OU Est Wind Power. The company also has holdings in solar power and biomass operations in Spain through Invetem Mediterranea and Gestora Fotovoltaica de Castellon.

A company so nice they named it twice is doubling its efforts to deliver power. NRG Energy, a leading power producer with a generating capacity of about 24,500 MW (including 345 MW from renewable energy), is moving onward and upward. The vast majority of NRG's power plants are in North America, but it also has one in Australia and one in Germany. The company's global portfolio includes about 190 generation units at 47 power plants. It also markets natural gas, oil, and other commodities, and invests in district heating and cooling and alternative energy projects. Its retail unit, Reliant Energy, distributes power to more than 1.6 million residential, business, commercial, and industrial customers in Texas.

Pampa Energ�a is one of Argentina's largest fully integrated electricity companies. Through subsidiaries or co-controlled companies, it generates more than 7% of the total electricity in Argentina, transmits some 95% of the country's electricity through transmission lines owned and operated by subsidiary Transener, and distributes electricity to more than 2.6 million residential and commercial customers through subsidiary Empresa Distribuidora y Comercializadora Norte (Edenor), the largest electricity distributor in Argentina. Pampa Energ�a maintains fossil fuel, thermal, and hydroelectric generation operations. Its distribution, transmission, and hydroelectric activities are regulated by Argentina's government.

Pinnacle West Capital is at the peak of the energy pyramid in Arizona. It is the holding company for the state's largest electric utility, Arizona Public Service (APS), which transmits and distributes electricity to 1.1 million residential, commercial, and industrial customers throughout most of the state. The utility also has more than 6,280 MW of generating capacity. Through APS and other subsidiaries, Pinnacle West markets wholesale and retail power in Arizona and the western US. The company also develops and manages real estate and invests in energy ventures.

Marsulex is scrubbing up smokestacks in North America. The company provides outsourced air-quality regulation compliance services to the oil refinery and power generation industries. Among Marsulex's emission-control products are spent acid regeneration and sulphate scrubbing systems; the firm also processes and sells sulphur by-products. Customers in Marsulex's oil-refinery segment include Shell, Petro-Canada, BP, and Sunoco. The company provides services to power-generation customers worldwide. Marsulex operates seven plants in Canada and ten in the US, including one in Southern California. In 2009 investment firm Harrowston Holding acquired control of Marsulex.

Degremont designs, builds, and operates water treatment plants worldwide to purify water and treat wastewater. The company has operations in more than 70 countries, and its plants provide more than 1 billion people with potable water. It is a specialist in designing and constructing facilities for seawater desalination by the means of reverse osmosis. It also designs and builds sludge treatment facilities. In the US the group operates through subsidiary Infilco Degremont. United Water formed a joint venture with Infilco Degrement in 2009 to operate a Water Environmental Research Center in Richmond,Virginia.

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.

China Three Gorges Project Corporation (CTGPC) is building the world's largest hydropower project -- the Three Gorges on the Yangtze River. Located near the Xilingxia gorge, a 185-meter-high project dam controls a drainage area of 1 million square km and an average annual runoff of 451 billion cubic meters. Construction on the massive project broke ground in 1994 and is expected to formally wrap up in late 2008. Subsidiary China Yangtze Power was set up in 2002 to manage two power plants, Gezhouba and Three Gorges. In 2009, in a major cash infusion, this unit paid its parent for the remaining 18 generators at the Three Gorges project.

RMT furnishes environmental engineering and consulting services to businesses that want to keep it clean. The company's services include solid waste management, liability reduction and remediation, air quality management, employee health and safety management, construction contracting, energy and alternative energy management, wastewater treatment, and data management services. RMT serves customers in the cement, chemicals, solid waste, electricity, forest products, metals, oil and gas, and textiles industries. Part of Alliant Energy's Integrated Services division, RMT operates 12 US offices with single locations in France and the UK.

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.

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