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I understand thermal and membrane distillation are very expensive and that slowed down their usage, but now we can bring 100% clean energy to power them. Except the set-up, the price of materials and the maintenance, I understand these other costs are not that heavy compare to energy from the grid ? Many global companies have been building global purification centers but I'm thinking if local initiatives can be cheaper and interesting even in developed countries ?

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closed as primarily opinion-based by airhuff, MaxW, aventurin, Gaurang Tandon, Mithoron May 4 '18 at 16:12

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.