John Bell, power plant trainee, leads a group of hydropower experts attending the 40th Annual Joint Hydropower Conference in Nashville Tenn., on a tour of the Old Hickory Dam powerhouse in Old Hickory, Tenn., April 19, 2017.

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Size: 1731px × 1155px
Photo credit: © Ted Small / Alamy / Afripics
License: Licensed
Model Released: No

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