The Pickens Plan was unveiled by billionaire T. Boone Pickens on July 8, 2008, aiming to break America's dependence on foreign oil. It proposed building a vast network of wind turbine farms across the Great Plains, what Pickens called the "wind corridor", to supply about 20–22% of U.S. electricity. Pickens estimated this shift could reduce annual foreign oil spending by roughly $300 billion, or about 43%. The full build-out called for roughly 100,000 wind turbines and about 40,000 miles of new transmission, supported by an estimated $1 trillion in private funding. Critics questioned the feasibility, warning the timeline was aggressive and that wind's intermittency would require significantly more infrastructure. Though the plan started a lot of conversation it was never completed, and in 2013 Pickens backed off and focused more on increasing domestic energy production.