Maybe have a look at that by now old old image. Notice the red square. It is a bit larger today, but the principle stays the same
https://en.wikipedia.org/wiki/File:DESERTEC-Map_large.jpg
There are enough roofs and waste lands for solar.
But out of curiosity, would you like to live next to a nuclear plant/uran mining/radioactive waste deposit?
Sorry is the idea here that we’d cover the Sahara in PVs? The Sahara desert, in Africa, the most dysfunctional continent on the planet. And, what, we’d lay a billion miles of transmission lines? You can’t keep reliable electricity running in those countries today because of how frequent copper theft is. You think building a solar farm is going to work?
This is the problem with PV boosters. It’s just fantasy about a supranational government doing mega projects, when in reality you can just build reactors today for an order of magnitude less in complexity and real estate. “Would I live next to a reactor” of course I would, because if I had that option my electricity would be free. Asking me if I’d want to live next to a uranium mine, well would you live next to a lithium mine? Disingenuous environmental activists have been using this bullshit argument for 30 years now, it doesn’t work on me.