Other than really wealthy economies with some urban concentrated population (near a sea/ocean), it just gets too expensive. Desalination is energy intensive and water is heavy so moving it around in large volume is also energy intensive.
So while it is technically feasible, it is economically impossible to desalinate water for large scale low value agricultural purposes (for example). The water crisis tends to have a big impact on agricultural populations (low income to begin with so adds less value to the economy) rather than urban centers (higher productivity, wealth and can afford to pay more for water)
Its not profitable. Solar and wind produce a power output over a year that looks more like noise than constant power. So you can’t really calculate with that let alone run a profitable business. Sure it’s technically possible but nobody will do it because you can’t really make money with it. For a steady clean water output you will need a steady power supply.
Desalination uses lots of power. Wind and solar power generate little power.
BUT, in a way, solar can be used, but by using the heat of the sun to evaporate water, thus separating salt from water. It’s pretty slow, though, so in most cases, it’s used to get to the salt, rather than to get the fresh water.
So, the problem isn’t if it’s possible or not, it’s possible. The problem is a matter of scale, you can’t scale it to the industrial scale needed to be meaningful.
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