How many watts of electricity does a hydro electric dam produce?

The answer depends on the size and efficiency of the hydroelectric dam. Smaller dams can produce as little as a few kilowatts (kW) of electricity, while larger dams can produce hundreds of megawatts (MW). For example, the Hoover Dam in the United States has a generating capacity of 2,074 MW, while the Three Gorges Dam in China has a generating capacity of 22,500 MW.