Tesla Model S

A Tesla Motors Model S is displayed in the Tesla showroom before a news conference at Tesla Motors headquarters on May 20, 2010, in Palo Alto, Calif. On May 9, 2013, Consumer Reports awarded the vehicle its top score - 99 out of 100 points. The Model S tied a Lexus 460L full-size luxury car tested in 2007 for the magazine's highest ever score.

A Tesla Model S electric car is on display during the second press preview day at the 2012 North American International Auto Show on Jan. 10, 2012, in Detroit, Mich.

Elon Musk, CEO of Tesla Motors, talks about the Model S electric vehicle during the press preview for the world automotive press at North American International Auto Show on Jan. 12, 2010, in Detroit.

In this June 22, 2012, file photo, Tesla workers cheer the first Tesla Model S cars sold during a rally at the Tesla factory in Fremont, Calif. The Tesla Motors Model S electric car has tied an older Lexus for the highest score ever recorded in Consumer Reports magazine's automotive testing on May 9, 2013.

Tesla Motors CEO Elon Musk and chief designer Franz von Holzhausen drive the new Tesla Model S all-electric sedan out into the street as members of the media look on, at the car's unveiling in Hawthorne, Calif., on March 26, 2009.

Tesla Motors CEO Elon Musk and chief designer Franz von Holzhausendrive the new Tesla Model S all-electric sedan as members of the media look on, at the car's unveiling in Hawthorne, Calif., on March 26, 2009.

Tesla Motors CEO Elon Musk and chief designer Franz von Holzhausen drive the new Tesla Model S all-electric sedan, in Hawthorne, Calif., on March 26, 2009.

A Tesla Motors Model S is displayed in the Tesla showroom before a news conference at Tesla Motors headquarters May 20, 2010, in Palo Alto, Calif.

The Tesla Model S is introduced at the 2013 North American International Auto Show in Detroit, Mich., on Jan, 15, 2013.

Tesla Motors CEO Elon Musk talks about the Model S electric vehicle during the press preview for the world automotive press at North American International Auto Show on Jan. 12, 2010, in Detroit.

Tesla presents an "engineering view" of their Model S sedan showing the underlying technology during the first press preview day at the 2011 North American International Auto Show on Jan. 10, 2011, in Detroit.

The Tesla Motors logo is seen on the hood of a car at Tesla Motors headquarters on May 20, 2010, in Palo Alto, Calif.