7. Grand Coulee Dam, U.S. (6.8 GW)

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Build as a part of President Franklin Roosevelt's New Deal in the darkest days of the Great Depression, the Grand Coulee Dam cost $300 million to build and draws from a 421 billion cubic foot reservoir. The hydro facility uses 28 generators and remains the largest single power generation asset in the U.S. In 1941, on a commission from the Bonneville Power Administration (BPA), folk singer Woody Guthrie wrote an eponymous song about the dam as a part of his "Columbia River Ballads" album.

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