Wind, biofuels and other renewable sources made up 10.6 percent of the energy the U.S. produced in the first half of this year than in the same period in 2007, accounting for more than 7 percent of the energy the country used.
A mix of solar power and natural gas is cheaper than natural gas alone for peak power, according to Greentech Media analyst Daniel Englander.
The San Carlos, Calif.-based electric-car startup says it is ready to deliver on its original promise of acceleration from 0 to 60 mph in "about four seconds."
