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Homebuilders, Restaurants Herald Cracks in Japan’s Power Market

Watami Co., a restaurant chain in Japan known best as a hangout for salarymen, is getting into the business of selling power -- and it isn’t alone.

The number of companies registered to sell electricity in Japan has more than doubled to 274 from 106 in September, according to the latest Ministry of Economy, Trade and Industry data. The list includes everything from restaurants like Tokyo-based Watami to homebuilder Misawa Homes Co.