The Netherlands built the world's first power plant where salt water meets fresh water to generate electricity, hidden inside a small blue building

Halfway along the Afsluitdijk, the 20-mile dam that has separated the salty Wadden Sea from the freshwater IJsselmeer since 1932, sits a small blue building that most drivers passing over the dam never notice. Since November 26, 2014, when King Willem-Alexander switched it on, this building has housed the world's first reverse electrodialysis power plant, a facility that generates electricity purely from the natural process of salt water and fresh water mixing.

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