In 2005, the US consumed 29 PWh of electricity. That’s petawatt-hours, which such a big number, “peta” is a rarely seen SI prefix. 29 PWh = 29 trillion (29,000,000,000,000) KWh.
At the moment, the Three Gorges Dam is operating at partial capacity because it is not finished. When it is completed, the dam will be able to provide about 90 TWh of electricity every year, equal to 90 billion (90,000,000,000) KWh.
That’s about 0.31% of the electricity consumed in the United States every year.
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