Its two branches supervised protective functions such as blackouts and special fire protection and "war service" functions such as child care, health, housing, and transportation.
However, in 2004, taped conversations of Enron traders became public, showing that traders were purposely manipulating the supply of electricity to raise energy prices.
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This is because about 40 percent of the electricity used in the greater Tokyo area is supplied by nuclear power plants in the Niigata and Fukushima prefectures.
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