Let us imagine a world, that is powered by solar panels. The only source of energy that we have is electricity from solar panels. So it would be a world poered by electricity. How would you make vehicles? I mean you need to melt metal, produce concrete (for buildings) etc. You would need to power the whole infrastructure by electricity. It might be possible, but it is not easy, and its technological feasibility is not demonstrated.

As soon as you start to think about the whole cycle, it becomes clear that having electricity form solar panels is not enough.