^I would say no, it isn't the nail in the coffin. They still need to replace that energy somehow, and there are still rolling blackouts in this region of Japan. Businesses are running with their lights and displays off during daylight hours and some are closing earlier than usual to help save power. Many trains are also running on 50% of their usual schedule.
Nuclear power accounts for a huge portion of the power grid in Japan, they do not have oil and coal reserves to tap into here. Many areas that were wiped out by the tsunami don't have any power yet, so when those places finally get rebuilt that will put even more strain on the grid. Something like solar just isn't going to replace all the power lost. I'm not saying there is no other way, but they need to supply affordable power to the population somehow. The options are somewhat limited.
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