At short distances from the solar farm, yes. But it's not 100% in every direction for arbitrarily long distance. At some point, you assume the energy will be tend to be used sort of near where it's generated.
To put it another way, if you build solar between city A and city B, would you build it so it can still be fully utilized even if city A stops using any power and city B wants all of it? No, you assume city A is always going to need some power.
Generally they connect directly to large back bone transmission lines that carry power far beyond the local area though not directly to more balkanized power zones. On a large scale yes if critical junctures go out the rest can't take the full load but that's different than a single plant being overspecced for the transmission capability it's connected to.
To put it another way, if you build solar between city A and city B, would you build it so it can still be fully utilized even if city A stops using any power and city B wants all of it? No, you assume city A is always going to need some power.