Mortenson, which builds about a quarter of America's wind-energy projects, is underway on its 100th wind installation while also marking its 15th year in the alternative-energy construction business.
The Rolling Hills Wind Farm in southeastern Iowa also is one of the largest projects ever built in the United States. When completed in December, Rolling Hills will generate 444 megawatts -- enough to power about 130,000 homes. The project is being built for Iowa-based MidAmerican Energy of Des Moines.
Mortenson will erect 193 Siemens, 2.3-megawatt, 80-meter-high wind turbines and build access roads and other infrastructure.
Mortenson also is building two wind power projects in Canada and nine in the United States. In all, Mortenson expects to add 1,363 megawatts of clean electrical power to the U.S. power grid by year-end 2011 that can power the equivalent of 400,000 homes.
"The scale of the Rolling Hills wind project is a solid indicator about the appetite for wind power in the U.S.," said Tom Wacker, a senior vice president who leads Mortenson's Renewable Energy Groups. "We're off to a good start for the first half of 2011. We've handled over 20 [wind farms] at one time, so we've got some capacity."
Mortenson's Renewable Energy Group includes 265 professionals, about 200 skilled trades workers and employs hundreds more annually through on-site subcontractors. The wind business slipped in 2010, but has a shot this year of approaching its record-construction year of 2009, thanks to rising coal prices and clean-energy mandates in Minnesota and other states.
According to the American Wind Energy Association (AWEA), the industry installed 1,118 megawatts in the first quarter of 2011. Another 5,600 megawatts is under construction. That's nearly twice the megawatts reported at this time in 2009 and in 2010.
Mortenson last year posted revenue of nearly $2.5 billion, according to Engineer News Record, an industry publication. Wacker said 21 percent is derived from Mortenson's wind and solar installations.