[Someone]

If it’s extremely hot, using solar energy should IMO be the first choice.

I don’t find https://en.wikipedia.org/wiki/Solar_desalination an easy read, but I think it says using PV to get electricity and that electricity to drive reverse osmosis is one of the best solutions.

Certainly, given that solar power is cheaper than nuclear (in the current political climate), nuclear can’t be the better choice for peak loads, which happen when there’s a lot of sunlight.