A three-port public electric-vehicle charging station, such as this one operated by Electrify America, in Nebraska, can cost as much as half a million dollars.If there’s one thing we could do now to hasten the transition to electric vehicles, it’s this: Build a robust public EV-charging infrastructure. While the media has focused on vehicle performance and range, consumers have always been clear that they want electric cars to do essentially everything their old vehicles do—including long overni...