Oh, another, more serious thought.
To create that kind of solar heat consistently enough to make it worthwhile, I would suspect you would have to built these things in the desert. You know, the places where water is scarce. So, seems like you’d have to have a massive pipeline built or expensive deep wells. This would require a huge infrastructure any way you look at it.
They’ve already built a solar mirror system to run boilers and it’s a boondoggle. They had glowing reports on it on one of those engineering shows. I did more research on it and they hardly ever run it because it’s too expensive to maintain.