Tesla drivers will be able to drive from Los Angeles to New York using the electric car company's Supercharger network by the end of this year, CEO Elon Musk said Wednesday night at the Wall Street Journal's D: All Things Digital Conference.

The network, which currently consists of only nine active stations, seven of which are in California, was already set to increase to 100 stations by 2015.

Instead, Tesla is planning "a dramatic acceleration of the Supercharging network," Musk said at the conference. "It'll be tripled. We'll put the map live tomorrow."

As the network expands, software in the Tesla cars automatically updates, so drivers will be routed to nearby Superchargers when necessary.

That expansion will be a tremendous boon for drivers, as the biggest problem for electric vehicles is the lack of cheap, powerful battery technology. That shortcoming keeps ranges limited, charge times long, and prices high.

Musk acknowledged the power of range anxiety in making potential customers wary of battery-powered electric cars, saying, "when people buy a car they're buying a sense of freedom that they can go wherever they want and not feel fettered."

At Superchargers, Tesla owners can charge their car batteries halfway in 30 minutes, for free. If the network really expands at the rate and density Musk promises, it will be a tremendous advantage for his customers.

Musk: By the end of 2013, they will cover most major metropolitan areas -- enough to drive from LA to NYC using only super-chargers. #D11 — AllThingsD (@allthingsd) May 30, 2013

At the same talk, Musk said he didn't join Tesla to get a return on his investment.