The Three Gorges Dam is the largest power station in the whole world.
Three Gorges Dam - Wikipedia, the free encyclopedia
Not only does it produce 22.5 GW of power without needing any input materials (it just needs the movement of the river which is free), but it also helps to control and stop flooding.
Do you know how many people died from floods before we built this dam? It went up to tens of thousands at one point.
But the Three Gorges Dam has been tested by multiple floods already, it has experienced one of the worst rainfall events since recorded history, and it worked perfectly. Despite having record high rainfalls and water surges in 2010, the Dam succeeded, and effectively stopped the flood from killing anyone.