PV scales fine. Do the math, please. There is far more than enough land onto which we can put PV farms. And the cost/W for solar (of which the cost of land is small fraction) is two order of magnitude below current fusion machines.
Of course this would never actually happen and we're in all likelihood gonna continue to trash the place, but is this possible even in theory?
Poetically, it would be a tale of isolation out in the middle of the Pacific, but I suppose you'd need to stay close enough to shore that you can transmit the power using wires, unless it's batched up in chemical storage.