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.
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.