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For taller wind turbines, Iowa engineer looks to concrete

Iowa State University engineer Sri Sritharan is developing a modular system that he says will enable wind turbines to be built taller. (Photo by Bob Elbert/Iowa State University)An Iowa State University engineer says wind turbines can be built taller by switching to concrete from steel.

Minneapolis utility fight ends with unique clean-energy deal

An electrical substation near downtown Minneapolis.  (Photo by Eric Wilcox via Creative Commons)The two investor-owned utilities serving Minneapolis are expected to reach a historic first-in-the-nation agreement today that will pave the way for a cleaner energy system in the city.

Murky waters: Chicagoans worry petcoke moving to barges

Barges filled with material that appears to be petroleum coke line the Calumet River in Chicago. (Photo by Kari Lydersen)Chicago residents are concerned that tougher regulations mean petcoke piles are moving from land to barges, but industry and port officials so far aren't willing to discuss it.

Retailers, seeking out bargains, continue to lead on solar

Workers install solar panels on a California Walmart store. (Photo courtesy Walmart)The top 25 companies in the United States installed 28 percent more solar capacity this year over last, and Midwest states are beginning to see a larger piece of the action.