U.S. Secretary of Energy Jennifer Granholm recently took a very public EV charging road trip. The challenges she and her entourage encountered are typical of EV owners everywhere every day, which she acknowledges. One problem that's slow to change is how inefficient the majority of current public chargers are. "When DC fast chargers were first built, 50 kilowatts (a measure of charging speed) was considered speedy," per NPR. "Times have changed. Many newer vehicles can charge at least three times faster than that. But those older chargers remain on roads, making up a sizable chunk of the country's fast-charging infrastructure."