New research done by a team from Switzerland and the United States suggests that the simple contact between saltwater and freshwater at the end of a river can be a massive source of energy because of osmosis.
The researchers built an osmotic power generator that in one side contains a higher concentration of seawater ions that the other side. The membrane contains a single opening that allows the passing of positive ions. As the ions make their way through the membrane their electrons move to the electrode providing a current. If this same design was used for other generators of greater size large amounts of energy could be generated. It's estimated that even just one square meter in size could produce 1 megawatt of energy. That's enough to power about 750 homes. Source: http://www.popsci.com/this-power-generator-runs-on-saltwater
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