On one side, there is concentrated seawater created by extracting fresh water; on the other, treated water from a sewage treatment facility. The membrane allows water to pass but blocks impurities. As water naturally moves toward the saltier side, pressure builds and is used to spin a turbine, which then drives a generator. The energy generated is minimal, and most of it is used to power the pumps. The photo shows the world's first plant near Oslo.
Of course, this plant is not economically viable; it is a mechanical toy for people with excess resources, time, and energy. How good that life is so easy!
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