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Largest hydropower plants by capacity in the U.S. 2020

Grand Coulee in Washington is by far the largest conventional hydroelectric facility in the United States. As of June 2020 it had a nameplate capacity of some 6.5 gigawatts. Ranking second, Robert Moses Niagara's capacity was less than half of Grand Coulee's capacity, at roughly 2.4 gigawatts. Overall, four of the largest ten conventional hydroelectric facilities were located in Washington state. Washington is also the largest U.S. consumer of hydroelectric power.

Largest operational conventional hydroelectric facilities in the United States as of June 2020, by nameplate capacity*

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Release date

August 2020


United States

Survey time period

June 2020

Supplementary notes

* Combined nameplate capacity of all generators within facility.

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Statistics on "Dams and hydropower in the U.S."

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