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FILE - This May 6, 2013 file photo shows a wind turbine farm owned by PacifiCorp near Glenrock, Wyo. Bigger, more efficient equipment will allow a western U.S. electric utility to redevelop an aging Wyoming wind farm with far fewer turbines while generating the same amount of power. Portland, Oregon-based PacifiCorp plans to replace 68 wind turbines at the Foote Creek I wind farm with 13 turbines over the next year. (AP Photo/Matt Young)

FILE - This May 6, 2013 file photo shows a wind turbine farm owned by PacifiCorp near Glenrock, Wyo. Bigger, more efficient equipment will allow a western U.S. electric utility to redevelop an aging Wyoming wind farm with far fewer turbines while generating the same amount of power. Portland, Oregon-based PacifiCorp plans to replace 68 wind turbines at the Foote Creek I wind farm with 13 turbines over the next year. (AP Photo/Matt Young)

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