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Energy

Tesla's cheap home batteries set to upend utility business

Powerwall puts solar power on a par with conventional electricity

Tesla's Powerwall storage battery offers 13.5 kilowatt-hours of capacity, enough to power the typical home for more than a day, according to the company's website.   © Reuters

TOKYO -- Prices for home power-storage batteries look likely to fall in Japan as U.S. electric car maker Tesla moves to offer its Powerwall batteries here, with major implications for the country's utilities.

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