I have long believed that the next major utility for major investment worldwide will be desalinization plants. Although initial investment and cost of fresh water production has been used as an excuse for not doing much of this I believe in the long run there will be no viable alternative. Fresh water is becoming a scare resource in many places worldwide. Should some of it be augmented by solar and wind where feasible? Definitely.
Will it be a huge profit machine? Unlikely. At best, as a semi-monopoly utility (at least in this country) it will be guaranteed the right to pricing that will permit making a modest profit. Necessity will become the great motivator. Amazingly, the growing scarcity of fresh water still seems to be a little bit below the radar in both national and international public discussions. We hear about it at the local level (San Q. Valley) but seldom at a higher level.