I think you're missing the point of why we make power grids instead of simply having city local generators or stations. The whole purpose of interconnecting po

I think you're missing the point of why we make power grids instead of simply having city local generators or stations. The whole purpose of interconnecting power generation sources is to be able to accommodate for dynamic demand and ensure resiliency. AC Power networks are sort of similar to how the internet works. The high voltage transmission lines are like the transit lines or "backbone" of the internet. Those lines connect power stations which are sort of like ISPs in that they deliver the last mile power to the end user. Our modern society basically instantly stops the second we are unable to meet demand for electricity, so we design these systems in a way where redundancy is supposed to be ensured. This isn't always the case though. Texas is a great example of a completely messed up electrical grid that is insufficient to support its populous. It causes deaths in heatwaves and freezes almost every year now.