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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.

The Powerwall is much cheaper than competing Japanese products in terms of storage capacity per kilowatt-hour. Taking into account the cost of installing solar panels and other costs, the batteries can make solar power competitive with electricity from the grid.

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