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A man pushes a stroller with groceries as flurries swirl around on Woodward Avenue in Detroit on Monday. Millions of Michigan residents have been asked to turn their thermostats down to conserve energy during the Polar Vortex. Ryan Garza/Detroit Free Press/TNS via Getty Images hide caption

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Ryan Garza/Detroit Free Press/TNS via Getty Images

Jayme Orrack oversees Xcel Energy's new wind farm in Courtenay, N.D. The wind farm started generating electricity late last year with 100 turbines that collectively generate 200 megawatts of electricity. Amy Sisk/Prairie Public Broadcasting hide caption

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Amy Sisk/Prairie Public Broadcasting

The Rise Of Wind Energy Raises Questions About Its Reliability

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