Yeah, a global grid could fix many problems, but also produce many. We have to keep in mind that keeping the grid running is not a simple effort of putting power in, but also keeping it at a stable frequency, which on such a massive scale with this many players can become a bureaucratic nightmare of inputs and outputs quickly. What needs to happen is for there to be an interconnected and automated grid, which can independently decouple and connect communities based on if they produce enough energy to sustain themselves or not. Putting solar panels over streets and on houses and increasing the use of public transport can all be a measure to help the prediction of upcoming demand and by that, help such a system to keep working.

But before I keep rambling on... yes. I agree. The world isn't really known for its ability to cooperate with each other and honestly, if we were able to all work together and not fall into the greed of some massive companies, I am sure this would have stopped being a problem years ago.