There is a huge hydroelectric powerplant there. A large part of the water is redirected to a special kind of turbine (basically a small nozzle shooting a high pressure jet of water onto a wheel that starts turning)
That turns a shaft connected to a generator that produces electrical energy. It’s then transported via power lines just like from any regular powerplant
The source of energy here is just the height of the water. Things high up have potential energy that is released when they fall down.
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