ADVANCE FOR PUBLICATION ON SATURDAY, NOV. 16, AND THEREAFTER - In this Nov. 5, 2019, photo, a worker monitors a hub replacement from atop a wind turbine in Walnut, Iowa. MidAmerican Energy's wind farm in Walnut, Iowa, has started repowering turbines, some of which have had their original blades since 2004. Blades can weigh up to 11,500 pounds. (Olivia Sun/The Des Moines Register via AP)
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