• Bloomberg, Kyodo

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Businesses and homes in Tokyo were asked to curb electricity use for a third day as a heat wave is set to reach its zenith for now, driving power margins to razor-thin levels.

The capital’s power-reserve ratios, which measure the spare electricity capacity, improved after the country’s grid coordinator ordered regional utilities to supply Tokyo. But the ratio briefly dropped to the 3% level considered the minimum for a stable grid Wednesday morning, according to the grid coordinator.

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