SSR, an independent investment research company, estimated in May that electrification of the entire 260 million US vehicle fleet would increase electricity demand by a third . . . . The North American Electric Reliability Corporation says in its “2017 Summer Reliability Estimate,” released in late May, that US electricity reserve margins this summer range from a high of 31.91 percent in SERC-SE, the part of the grid covering all or portions of Alabama, Mississippi, Georgia and Florida, to a low of 17.45 percent in ERCOT, which serves Texas. ERCOT is projecting reserve margins above 18 percent in four of the next five years. ERCOT total generating capacity is 82,000 megawatts. The 2017 summer peak demand is expected to reach 73,000 megawatts.