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By 2050, the U.S. can phase out its use of oil, coal, and nuclear energy by using energy more efficiently and relying on natural gas and renewables to fuel the U.S. economy. The energy efficiency opportunity accounts for more than half of the business-as-usual consumption in 2050 (assuming frozen efficiency from 2010–50). Aggressively exploiting this opportunity makes the transition from oil and coal cost-effective, and enables a roughly one-third reduction in natural gas consumption and a major investment in renewable energy. Note that if the hydrogen shown were all reformed from natural gas, it would come half from gas and half from steam.