That’s a stupid idea. You’d need extremely long cables that would keep getting tangled up around the city. They would have to be disconnected and the bus would have to connect to closest socket to continue on the route. They would also need to have huge spools of cable, and soon the city would be drowning in cables. You’d have to keep rebuilding all the buildings on top of cables. Again and again. Then at some point, the city would be so high there wouldn’t be enough air for people to breathe. Do this everywhere, and you may even considerably slow down Earth’s rotation.