ssive speculation on Wall Street and among EV and battery nerds as to what he will say, including a forecast that he intends to create a business feeding the electric grid and another that he will start selling his batteries and power train to competitors. Mu…as been obsessive speculation on Wall Street and among EV and battery nerds as to what he will say, including a forecast that he intends to create a business feeding the electric grid and another that he will start selling his batteries and power train to competitors. Musk’s Twitter …