Tesla batteries

Tesla CEO Elon Musk unveils the Powerwall, which uses Tesla batteries to power homes and utilities, during an event in Hawthorne on April 30.

(Luis Sinco / Los Angeles Times)

April 30, 2015 10:51 PM PT

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Tesla CEO Elon Musk unveils the Powerwall during an event at the company’s plant in Hawthorne on April 30.

(Luis Sinco / Los Angeles Times)

People wait before the unveiling of the Powerwall at Tesla’s plant in Hawthorne on April 30.

(Luis Sinco / Los Angeles Times)

Carrie Lederer, a Santa Monica resident and Tesla car owner, poses with the Powerwall during an event at the company’s plant in Hawthorne on Thursday.

(Luis Sinco / Los Angeles Times)

Tesla CEO Elon Musk unveils the Powerwall at the company’s plant in Hawthorne on April 30.

(Luis Sinco / Los Angeles Times)

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