Assmuming that the various parties involved can find a way to cooperate a bit instead of fighting tooth and nail, there’s no reason the power grid can’t continue to operate and in fact, grow. There are some enterprises, including large recyling operations and data centers, that will continue to use far more energy than Old Sol beams at their roofs. Likewise, peoples’ homes in some areas will require a lot of energy to be habitable for at least part of the year (like in the upper Midwest in the dead of winter, or the southwestern deserts in mid-summer). With a little adjustment of their business models, power distributors could become more like brokers, redistributing whatever some users had in excess to those that needed it, a kilowatt-hour at a time. That’s what Enron claimed to set out to do in the first place. Whether they lost their way or were lying about their intentions from the beginning is open to conjecture.