For the same reason you "cannot" drill for gas in Germany: it's very hard to do something that someone else can do cheaper. It requires constant work against th

For the same reason you "cannot" drill for gas in Germany: it's very hard to do something that someone else can do cheaper. It requires constant work against the market, either by tarifs or subventions. And desalination will always be cheaper if you have to do it anyway, because the (local) value of water is so high