Wind turbines are seen on the hills in the Tehachapi Pass near the Mojave Desert in Southern California on Thursday, March 14, 2013. Over 16,000 turbines are in use in California, 5000 are located in the Tehachapi Mountains. Today, wind turbines collectively generate 1.3 billion kilowatt-hours of electricity per year - enough to meet the residential needs of nearly 500,000 people. (AP Photo/Alex Menendez)
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