Power sold by the nation’s 10 regional electric utilities in January surged 8.9 percent year on year to 83.2 billion kwh, an all-time high for a winter month, according to preliminary data released Friday by the Federation of Electric Power Companies of Japan.

The figure, which is the second-highest ever for any month after that for August 2002, was attributed to colder-than-average weather that swept across the nation and boosted heating demand.

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