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Tokyo Power Quake-proofs Its Grid Control System

Backup facility is designed to withstand extreme jolts

2 min read

For a land regularly pummeled by typhoons and shaken by earthquakes, not to mention its several active volcanoes, Japan suffers remarkably few electric power disruptions of any duration. In the 10-year period between 1992 and 2001, customers of Japan's largest power supplier, Tokyo Electric Power Co. (Tepco), suffered an average power outage of less than 5 minutes in any given year.

By comparison, customers of 65 power utilities across 24 states in the United States had sustained power interruptions totaling 107 minutes on average in any one year during the same period, according to the nonprofit Electric Power Research Institute, based in Palo Alto, Calif.

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Greg Mably


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