President Obama has called for a “national mission” to end America’s dependence on oil. Perhaps the biggest hurdle, however, isn’t national will—a majority of Americans now back an energy overhaul—so much as finding a workable template. Could Hawaii fill the void? The archipelago is more than twice as oil-dependent as the U.S. at large, drawing about 90 percent of its energy from imported crude. And because of the exorbitant transport costs, it also has the highest gas and electricity rates in the country—and some of the most ambitious plans for keeping them down.