> > Changing home voltage from 120v to 240v is unlikely to do anything to help the grid, as the higher-voltage transmission lines would carry the same amount of energy (and current) either way.
>
> Higher voltage allows more wattage. It’s the amps that create the heat which makes things fry.

Sure, but changing homes from 120v to 240v does nothing to lessen the amperage being carried by the high-voltage transmission lines, and those are where the grid is constrained.