Wind turbines dot the landscape in Mojave, Calif. The recent extension of federal tax credits is expected to give the wind and solar energy industries a big boost. Irfan Khan/LA Times via Getty Images hide caption

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The first foundation jacket installed by Deepwater Wind in the nation's first offshore wind farm construction project is seen next to a construction crane on Monday, on the waters of the Atlantic Ocean off Block Island, R.I. Stephan Savoia/AP hide caption

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Renewable energy sources — such as the Eolo wind park about 75 miles south of the Nicaraguan capital, Managua — generate about half of the country's electricity. Officials predict that figure could rise to 80 percent within years. Inti Ocon/AFP/Getty Images hide caption

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A pilot for Earl's Flying Service sprays chemicals on a field in southeastern Missouri. Courtesy of Mike Lee hide caption

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Five industrial wind turbines form part of the Gorona del Viento power plant on the island of El Hierro. By the end of this year, the power plant is set to generate 100 percent of the energy El Hierro needs, making it the world's first energy-independent island powered only by renewables. Lauren Frayer for NPR hide caption

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A wind-powered water pump and a wind-driven electricity turbine share a field near the town of Calumet in western Oklahoma. Joe Wertz/NPR hide caption

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Energy

Oklahoma Wind Power Companies Run Into Headwinds

The state produces a lot of energy, but environmentalists and the oil industry are joining to combat wind power companies as they try to expand.

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The Department of the Interior is proposing a large expansion of U.S. efforts to make energy from offshore winds, with a plan centered off the Massachusetts coast. Here, a 2010 photo shows a sunrise over Nantucket Sound. Julia Cumes/AP hide caption

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The offshore wind farm in the North Sea near Borkum, Germany, is nearly complete. The Riffgat facility, seen here on June 23, includes 30 turbines, each with a generating capacity of 3.6 megawatts. David Hecker/Getty Images hide caption

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A maintenance worker looks out over an off-shore wind farm in Liverpool, England in 2008. Some people are concerned about the potential health effects of noise from wind turbines. Christopher Furlong/Getty Images hide caption

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