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Tesla unveiled a high-speed charging station last night aimed atfreeing owners of its Model S electric sedan from worries about runningout of juice on a long trip.

Already, Tesla has installed four ofthem to connect Los Angeles, San Francisco and Las Vegas. CEO Elon Musktold owners and press at a swanky ceremony at Tesla's Los Angeles areadesign studio that a network of "superchargers" will be installed acrossthe U.S. in about four years, about 100 in all.

"People have thisidea that if you have an electric car, you have no freedom --you'restuck," Musk explained. The stations will dispel the notion, he added.Tesla's Model is comes in various ranges, all the way up to 265 milesper charge, the most of any pure electric car.

Each will includeabout four to six charging stations. Only Tesla Model S sedans havecharging systems that allow them to use the high-speed chargers. Theywon't work on rival electric cars or even Tesla's older $109,000roadsters, which raised the ire of at least one set of owners.

Thecharging stations will be installed near groups of restaurants, soowners can go inside for a meal while their cars recharge. They'll befree.

In an interesting "green" twist, Musk said the stations willalso be linked to solar arrays that will pump electricity back into thesystem. In essence, Musk said, the cars will charge from sunshine, notpower plants. The array will be capable of producing enough electricityequal to 100,000 miles of driving a year.

Musk says owners weren'tasking for it. They're just getting it. "This is something those whobought the car didn't know they were getting," he says.