If the U.S. is going to meet its goals for electric vehicle adoption, Texans will need to buy millions of battery-powered cars and trucks over the next eight years. Experts hope federal funding for EV charging stations to be developed in coming years will spark the switchover. But what happens when most, or even half of, Texas’ residents are plugging their cars into the grid to charge? Even though that’s years away, it’s a question environmentalists and renewable energy experts are already worried about.