> The Hoover Dam generates, on average, about 4 billion kilowatt-hours (4 TWh) of hydroelectric power each year for use in Nevada, Arizona, and California - enough to serve 1.3 million people.

Edit: Looks like the "single hydroelectric plant" is the Three Gorges. Hot dam, that really puts Hoover to shame.

> The Three Gorges Dam has been the world's largest power station in terms of installed capacity (22,500 MW) since 2012 (10% of China's electricity).