[Reeses]

In Mexico most of the houses have black water tanks on their roofs, but no solar electric generation. They are poor there so they wouldn’t do it if it didn’t make economic sense. Lancaster is more hispanic than white and has plenty of heat so turning it into a Mexican town and learning Spanish will work for them.

[Professional Engineer]

In Mexico most of the houses have black water tanks on their roofs, but no solar electric generation.

I like this idea, or some variation. In one of his novels, Heinlein wrote about a variation using black pipe attached to the sides of a vardo.