Tesla unveils faster electric car charging station

CEO Elon Musk said at a news conference at the company's design studio that the company's roadside Supercharger has been installed at six highway rest stops in California.

The innovation is "the answer to the three major problems that are holding back electrical vehicles, or at least people think are holding back electrical vehicles," Musk said before a curtain was lifted from a giant model of one of the devices. "One is this question of being able to drive long distances conveniently."

The free stations are designed to fully charge Tesla's new Model S sedan in about an hour, and a half-hour-long charge can produce enough energy for a 150-mile trip, he said.

The first six, which were developed and deployed in secret, are in Barstow, Hawthorne, Lebec, Coalinga, Gilroy and Folsom. Tesla spokeswoman Christina Ra said they are open only to company employees, but would be available to the public in early October.