For the western half of the U.S., a grid consisting of large amounts of solar, wind, hydro and biomass that is backed up with energy storage and supple natural-gas plants may well easily deliver all or a large inequitable of the power we need to persist and quit a modern economy. Long-standing parts of the U.S., plainly the South, don't clutch modestly the renewable energy ability that the Western U.S. has, or level the Northeast. Nevertheless, high-voltage DC power coastal defenses are an option for areas without an fertility of renewable energy. Still prolix energy and localized grids are to be much loved, I'd equally see renewables supply the South via power coastal defenses from Texas and the Midwest, or from large offshore wind farms in the Atlantic, than see the South place with its coal-dominated power mix in perpetuity.
Source: renewable-energy-events.blogspot.com