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Water Energy
There are many ways to get water energy. It has been harnessed for thousands of years in the form of dams and waterwheels that can turn any number of devices from millstones to machinery. It is incredibly efficient and constant when applied in the right way and a large enough space. A small stream may not have enough power of consistent flow to make it worth it, but big rivers can produce huge amounts of power.
Water energy can be harnessed by damming a river and allowing a lake to form. The weight of the water pushes a lot of pressure through giant turbines that spin to create electricity and the water is emitted back into the river, usually much cooler than before because it has come out of the bottom of a big lake and been cooled. The surface water is still just as warm as the river feeding it, and many reservoirs are used for recreation as well.
Other forms of water energy are vortex power which creates a vortex and then harnesses its energy, tidal power which uses the movement of the tides to generate electricity, wave power which collects the energy coming in from waves, marine current power and underwater ocean thermal power which collects heat from deep underwater volcanic vents.