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Negative electricity prices registered in nearly all European energy markets
(www.pv-magazine.com)
Everything about energy production and storage.
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Probably because it's expensive and needs a lot of land. My point is still valid. The brine is a problem. Just like trash being a problem if not recycled properly (because it's more effort than just dumping or burning it).
That being said, I love the idea of having quasi infinite sweet water supplies but unfortunately it's not that simple.