Tesla Motors is building out its supercharger network adding a couple of hundred charging stations by 2015 that will be able to provide power even if the national grid goes down.

The solar-powered supercharger stations will have battery packs for grid storage of power so they'll work "even if there's a zombie apocalypse," CEO Elon Musk said. He then laughed and added, "I can see the headlines now: 'Musk warns of zombie apocalypse.' "

The battery storage capability of the stations was one technological advancement Musk pointed to in explaining the future of Tesla's charging network.

Coast to Coast by Year-End

Starting next month, Tesla will begin a rapid expansion of its supercharger network. It will triple to 24 locations in the U.S. by the end of June with new charging locations in the Pacific Northwest, Texas, Colorado and Illinois.



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Then over the next two years Tesla will add another "couple hundred" locations, Musk said.

"The overarching goal here is to give people a sense of total freedom of travel," he said. "We don't want people to feel constrained that because they have an electric car they won't be able to drive where they want and how they want."