A serious blackout plunged parts of Tokyo into darkness in the rush hour Monday morning after a ship's crane damaged a transmission line spanning a river. The outrage failed traffic signals and left about 1.39 million households without power. Tokyo Electric Power Co., Japan's biggest utility, said power was restored to the capital 10:44 a.m. local time, about four hours after the electrical failure. The outage was the fourth-largest for Tokyo Electric, accounting for 2,160 megawatts or 4 percent of daily average peak demand in Tokyo and surrounding prefectures during summer, said the police vice chief in Urayasu, a city on the eastern edge of Tokyo. The company's biggest outage was during a heat wave in July 1987, when it lost 8,170 megawatts of power.

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