The U.S. will surpass Saudi Arabia in oil production in the next decade, making the world’s biggest consumer almost self-reliant in energy, the International Energy Agency said. Growing supply of crude extracted from “tight” underground rock formations will transform the U.S. into the world’s largest oil producer by about 2020, lasting until the middle of that decade, the Paris-based adviser said today in its annual World Energy Outlook, which projects energy trends through 2035. New domestic sources will curb imports and turn North America into a net exporter by about 2030, the agency said.