As wind turbine blades spin on General Electric&amp;#8217;s television commercials, the question of how to really feed the electric-car chargers &mdash; called WattStations &mdash;&nbsp;ballyhooed on a bunch of other GE commercials has crossed many a thinking person&amp;#8217;s mind. Including Jeff Immelt&amp;#8217;s, apparently. Public policy, corporate strategy and consumer demand are all pointing to a vast [...]