The document discusses 5 large dams around the world: Tucurui Dam in Brazil, Guri Dam in Venezuela, Xiluodu Dam in China, Itaipu Dam on the Brazil/Paraguay border, and Three Gorges Dam in China. Three Gorges Dam is described as the world's largest power station by installed capacity at 22,500MW. It has 32 main turbines and cost $22.5 billion to construct. The dam stores water that slightly increases the length of the Earth's day and reduces its speed.