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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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