Enel S.p.A. owns and operates more than 70 renewable energy plants in 20 states and two Canadian provinces. Enel North America's plants have a capacity to generate 748.5 MW of power (406 MW of wind power, 314 MW of hydropower, 21 MW of biomass power and 7.5 MW of geothermal power). Its wind farms use Vestas and GE Energy turbines; its largest project, the Smoky Hill Wind Farm in Kansas, has 155 wind turbines that alone generate 250 MW of power (enough to power 85,000 homes for a year). Enel North America's only biomass plant is located in Quebec, where it offsets 1 million tons of carbon dioxide by burning wood waste each year.

Let's cut right to the point: construction materials and mining used to be the lifeblood of Knife River Corporation, but in recent years, its energy and utility operations have grown to be the largest portion of its business. Oil and natural gas production, power transmission, pipelines and power utilities now dominate Knife River's balance sheet. But don't count out its construction services division, which continues to produce record earnings. Knife River has operations in Alaska, Hawaii, Oregon, California, Idaho, Minnesota, Montana, North Dakota, Oregon, Texas, and Wyoming. The company is a subsidiary of MDU Resources Group, Inc.

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.

Clean Energy Fuels Corp., together with its subsidiaries, provides natural gas as an alternative fuel for vehicle fleets in the United States and Canada. It designs, builds, finances, and operates fueling stations; and supplies compressed and liquefied natural gas. Clean Energy Fuels Corp. also produces renewable biomethane, which could be used as vehicle fuel. In addition, it provides natural gas conversions, alternative fuel systems, application engineering, service and warranty support, and research and development for natural gas vehicles. As of December 31, 2009, the company served approximately 390 fleet customers operating 17,790 natural gas vehicles in public transit, refuse hauling, airports, taxis, seaports, and regional trucking markets. It owned and operated 196 natural gas fueling stations in Arizona, California, Colorado, the District of Columbia, Florida, Georgia, Idaho, Maryland, Massachusetts, Nevada, New Jersey, New Mexico, New York, Ohio, Oklahoma, Texas, Virginia, Washington, and Wyoming; and British Columbia and Ontario, Canada. Clean Energy Fuels Corp. was incorporated in 2001 and is headquartered in Seal Beach, California.

Xcel Energy has accelerated its energy engine into utility markets across the US. The utility holding company distributes electricity to 3.4 million customers and natural gas to 1.9 million in eight states; Colorado and Minnesota account for the majority of its customers. Its regulated utilities -- Northern States Power, Public Service Company of Colorado, and Southwestern Public Service -- have more than 20,500 MW of primarily fossil-fueled generating capacity. Xcel also has 35,200 miles of natural gas transmission and distribution pipelines. Pushing green energy sources, in 2008 Xcel announced that it would develop solar-generated power plants in Colorado as part of its green energy initiative.

Pure water is the aim of water process engineering specialist Enpure. Enpure specializes in treating water, wastewater, and sludge for municipalities and businesses. Its services include process design and project management for water treatment facilities worldwide. There are more than 4,000 plants in 60 countries designed by Enpure. The company licenses the sonix ultrasound sewage treatment technology sold through Sonico, Enpure's joint venture with Atkins. It had been a part of the support services division of water utility AWG until its management (in partnership with Aberdeen Asset Management) bought out the company at the end of 2006. The company changed its name from PURAC at that time.

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.

Origin Energy focuses on integrating businesses within the energy industry, primarily in gas production, power generation, and energy retailing in Australia and New Zealand (through Contact Energy). It also invests in renewable energy technologies. The company is the #2 retailer of natural gas, electricity, and liquefied petroleum gas (LPG) in Australia with some 2 million customers (mostly in Victoria). Origin explores for and produces gas and oil in Australia and New Zealand and supplies markets in Australia, New Zealand, and the Pacific. The company focuses on the Bass and Otway Basins offshore Victoria, the Perth Basin in Western Australia, Queensland's coal seam gas areas, and New Zealand's Taranaki Basin.

PJM Interconnection, which oversees a 56,350-mile section of the North American power transmission grid that spans across 13 northeastern and midwestern states and the District of Columbia. The regional transmission organization monitors and coordinates the movement of wholesale electricity in its service territory; its more than 560 members have a combined generating capacity of about 164,000 MW. Sanctioned by the Federal Energy Regulatory Commission, PJM is charged with ensuring fair competition among power purchasers, sellers, and traders; it also is responsible for the reliable delivery of distributed electricity to about 51 million consumers in its territory.

Dalkia doesn't balk when it comes to managing its clients' energy needs. The company's services include electricity, water, and natural gas procurement, energy efficiency consulting, electrical and mechanical contracting, building management control, and outsourced facilities maintenance. It installs onsite power generation, HVAC (heating, ventilation, and air conditioning), water treatment, fire protection, and lighting systems. The company serves manufacturers, offices, schools, hospitals, and other businesses. Its Sterience subsidiary sterilizes surgical instruments for hospitals.

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