Cabling in robust internet wouldn't be too hard, if that were the only factor. Pull fiber from Salt Lake City and Albuquerque, maybe Denver and Phoenix and boom. There's US highways in all directions, so you can pull along the road, most likely. You'd get at least two way redundancy going North and South, maybe three way if you take different paths to get to Phoenix and Albuquerque.
But you also need/want robust power delivery to run a datacenter, and a single local solar project isn't robust power delivery. If you had robust power delivery, those transmission lines could be used to export the solar, and it wouldn't make sense to put a datacenter there anymore.