alt Hacker NewsHorrifically pessimistic numbers for PV (winter in maine with conversion efficencies half what they are now)... comes out to about a 50x50 mile square of panels to generate the entire USA's power demand from the most recent DOE numbers. Ignore that we can have wind, solar, and crops* in the same area. Turns out, btw, crops don't like high noon beating down on them. As a result we can reduce water usage and get nearly the same crop yield if part of the field is covered with panels- at least according to some studies.
That isn't the whole story. At least some of these new datacenters are gigawatt class. That's multiple sq km of solar.
Water usage is also an issue. A continuous 1 gigawatt is enough to boil off 1.3 million liters per hour which over 24 hours equates to very roughly 90k residential users. If it isn't boiled but is instead returned lukewarm it will require many times that amount due to how large the heat of vaporization is. Compare to the entire state of Florida at "only" 23.5 million people.