The real magic is not putting all the cells in one place. It's distributing them over the land mass.
A single solar power station can be taken out by a cloudy day.
A million little solar power stations spread across an continent average together into an even power source that provides power for longer than daylight hours.
There's a practical limit on how far you can ship power. Some while ago I tried to model what it would take to maintain continuous power worldwide with just looking at day/night. Nope, couldn't be done even if your cells were free. Just the wires became impossible--I was looking at the best wires to date and that still translated into a number of nines (I forget how many) on the loss percentage--and some mechanical bottlenecks were you simply didn't have enough land to run the wires.
The higher you run the voltage the more corona loss, the higher you run the current the more resistance loss. And there's a limit to how close you can put the wires to each other before they interfere. The band of land required for the massive power bus is gargantuan.
A single solar power station can be taken out by a cloudy day.
A million little solar power stations spread across an continent average together into an even power source that provides power for longer than daylight hours.