Nothing which is needed for net zero by 2050 is wasted, because a little more or a little less emission savings in such a short timeframe are irrelevant. New England, the central U.S., and Tennessee need to get to net zero too a cross nation HVDC network making the whole US dependent on a couple southern states is probably not how those states want to get there.
So build more solar, build more electrolyzers, build more storage (straight hydrogen, or chemically stored in some other form) everywhere. That's how you get to net zero with renewables. The united states is already behind schedule, worrying about optimality of emission savings is missing the forest for the trees.