Does Tesla really need a $5 billion battery?

In a project that is befuddling industry experts and competitors, Tesla Motors Inc. is looking for possible sites for a giant electric-car battery factory in four Southwestern states. The plant, dubbed a "gigafactory" by Tesla Chief Executive Elon Musk, would be the world's largest factory by a long shot. Tesla executives say they need the Gigafactory to guarantee the supply of millions of battery cells and to cut costs through scale and logistics savings. "We have enough suppliers and wouldn't get the notion to build a battery factory."

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