Clean water is the goal of H2O Innovation. For amusement parks, campgrounds, cities, schools, zoos, and other enterprises, H2O Innovation uses micro filtration, ultra filtration, nanofiltration, and reverse osmosis to create drinking water, as well as clean water for manufacturing and other purposes. H2O Innovations also treats wastewater, offers equipment for the maple syrup industry, and desalinates seawater and brackish water. In 2007 it became the first North American company to be listed on the Alternext (Euronext) Exchange in Paris. By 2008 the company had installed more than 400 systems in Canada, the US, and elsewhere.

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.

Horizon Wind Energy owns and operates more than 20 onshore wind farms across nine states that have a generating capacity of 2,800 MW. It has another 20,000 MW of wind projects in various stages of development around the country. Horizon sells its electricity wholesale as Power Purchase Agreements (PPAs) to utility companies such as AmerenUE, Direct Energy, Great River, and the TVA. It has also developed and sold seven farms to Entergy, Florida Power & Light, and Puget Energy.

IBERDROLA RENOVABLES is the leader of wind power in Iberia and the world. The company is the renewable energy arm of Spanish utility giant IBERDROLA S.A. IBERDROLA RENOVABLES has a presence in more than 20 countries across Europe, North America, South America, and Asia. In early 2010 it had an installed generating capacity of 11,000 MW). The company's flexible arrangements with suppliers, and geographic diversification has enabled it to build a total capacity (including developments in the pipeline) of more than 57,400 MW. Besides wind energy, the company invests in small hydroelectric, solar, tidal, biomass and other green energy sources.

Infiltrator Systems is not connected to The Spy Who Came In From The Cold, spy satellites, or any other relic of Cold War espionage. The company is the world's leading maker of plastic leachfield products used to handle commercial and residential wastewater. Infiltrator Systems' leachfield drainage chambers are a direct and cost-effective replacement for stone and pipe leachfields, and create a footprint only half the size of traditional leachfields. The products, which are made at facilities in Kentucky and Utah, are sold throughout the US. The company estimates that one in four septic systems in the US uses Infiltrator Systems' products.

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.

LifeSource Water Systems uses is customer satisfaction. The water treatment product company manufactures and distributes water filtration equipment to residential, commercial, and industrial customers. LifeSource Water Systems' system uses an activated carbon filter rather than salts or chemicals. Its Beotron branded systems have earned the Gold Seal certification issued by the Water Quality Association. The company operates primarily in California; it also maintains outlets in Idaho and Nevada. LifeSource Water Systems was founded in 1984.

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.

Mesa Power Group, it takes an oil tycoon from Texas to raise the profile of wind energy in North America. Controlled by veteran oilman and renewable energy proponent T. Boone Pickens, who gained national attention with the Pickens Plan, a campaign aimed at reducing US dependence on foreign oil, the company is engaged in developing and investing in wind power projects. It acquires these projects and completes development on them through a joint venture with GE called the American Wind Alliance (AWA). It typically targets projects in Canada and the US that have secured land control, access to transmission lines, and minimum capacity of 100 megawatts.

MidAmerican Energy Holdings reaches farther than its name implies. The company generates, transmits, and distributes electricity and natural gas to 6.9 million customers across the US and the UK, primarily through subsidiaries MidAmerican Energy Company, PacifiCorp, and CE Electric UK. UK regional distribution subsidiaries Northern Electric and Yorkshire Electricity serve about 3.8 million electricity customers. MidAmerican Energy Holdings also has independent power production; real estate (HomeServices of America); and gas exploration, production, and pipeline operations (Kern River Gas Transmission and Northern Natural Gas). Warren Buffett's Berkshire Hathaway controls the company.

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