"“That might be discharging,” suggests Mendenhall. “You’ll hear those clicking sounds throughout the afternoon as the batteries go back into the grid.” The first time he heard it, he thought there was something wrong—Tesla assured them it’s normal—and it’s still so new that nobody at the winery feels like an expert yet. But the plain white box clicking to itself on the edge of a vineyard is one representative of a wholesale shift in the way we think about energy."