More than is typical even for technology entrepreneurs, Neha Palmer is in the business of predicting the future. TeraWatt Infrastructure, a startup unicorn based in San Francisco, is a bet on the idea that some future day, companies from taxicab operators to e-retailers will have large fleets of electric trucks, cars, and vans—and need somewhere to charge them. Palmer’s strategy is to figure out where to start building chargers now, a process that can take years, to serve that future demand.