You can place ground based solar farms just outside cities where they have access to main power lines that can carry megawatts; inside the city they probably can only push kilowatts per phase.

30kW is the limit for commercial (or any 3 phase) solar generators in my town, that is cheaper to mount on the building roof

The solar farm nearest me, right near the high voltage wires that supply that side of the city, has 13MW of panels, three orders of magnitude more