That is the 3.0 insolation I chose. It’s reasonably representative of areas of northern hemisphere cities. The United States average by population is probably between 4 and 5 according to this map, but winter is lower and you have to plan for that.

https://www.nrel.gov/gis/images/eere_pv/national_photovoltai...

Here is a map of the world…

https://globalsolaratlas.info/downloads/world

Northern Europeans are going to want to have some power lines to the south. Chile might be the new aluminum refining capital of the world. Africa would be energy rich.

So choose land that is poor for food production and good for electricity production, then find a way to transport the energy (one good advantage of gas/coal/oil is transportability with current infrastructure).