There is still no lasting peace deal in the Persian Gulf, but energy-hungry Asia is already drawing energy lessons from four months of war: it needs bigger buffers, a greater diversity of fossil-fuel suppliers, and a better mix of power sources overall. Flows of oil and natural gas have been returning to normal and prices have tumbled since an interim US-Iran accord was signed last month that pried open the Strait of Hormuz, relieving the immediate sense of crisis.