Well, it comes down to this. to over simplify, OHM's Law: E/I*R and in non inductive loading circuits P/I*E.
It comes down to the relation of how fast the power utility can respond to then decide to island the area or try to sych it in.
There is initatives to run a remote grid, with current connections to the general grid with decisions as to how to handle the remote capabilities should there be a seperation, as well as total seperation and black start ability already in place.
Rest assured, I know hard to swallow, bu those of us in the Power System Industry hve been working on this scenario for several years.