Not an expert here. Far from it, but it sounds like the electric generation and the grid control systems have the possibility for multiple sites of failure as well as multiple sites for intrusion by bad guys. This sounds like a recipe for disaster. Hopefully critical sites such as the defense department, local police departments, hospitals, etc., have standalone electric generators independent of the grid and web. Then again, a large enough cohort of spies and terrorists could disable those. Maybe we need a system of signal fires, flags, carrier pigeons to keep the grid up in an emergency. If the fuel supply or cooling water to power plants is shut down, why worry about the Internet controls.