[thinkcontext]

We already devote enormous tracts of land in the US for energy from solar for transportation, way way more than we'll ever need for PV. Fully 40% of the US corn crop goes to ethanol.

People talk about how bad solar efficiency is in turning sunlight into usable energy at around 20%, corn is only able to do 1-2% and then it has to be processed into ethanol. Thus, replacing corn for ethanol with solar would result in massively more energy available for our use (not that I think that would be a good idea or that we could even use that much solar electricity).

edit: And I should add that there's likely to be plenty of farmland becoming available due to water shortages. Think about it, say you are a farmer that has water rights and use it to grow a low value crop like alfalfa. You can put up solar panels and sell your water rights and you don't have to do any work. Or if you rely on groundwater, lease your land for solar for 20 years and let the aquifer recharge during that time.