Re: Local generation
Those other grids are also a LOT bigger. As I said, you cannot rely on interconnects as you get out of gaol free card. They are there to help. The NY and London blackouts showed that even trivial small failures cause cascade failures which quickly shut down large sections of the grid. The texas blackout runs deeper than no interconnects or frozen wind turbines.
https://app.electricitymaps.com/ shows the US grid regions but does not show the interconnects.