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Power Blackout

Officials: Many issues led to Southwest blackout

A power outage that affected 7 million people last month in the Southwest U.S. and part of Mexico was not solely caused by a utility worker doing a minor repair job, as originally thought, utility officials said Wednesday.Federal officials and executives from California and Arizona utility companies said they still don't know exactly what happened the afternoon of Sept. 8, when power was knocked out for up to 12 hours from Arizona to southern California and into the northern part of Mexico's Baja California.While the utility employee's work on a transmission line at an Arizona substation was the first action in the chain of events, it should not have triggered a massive blackout because the system is built to quickly compensate for such glitches, utility officials said.Investigators have discovered that at least 20 events took place within an 11-minute period, said Stephen Berberich, president and CEO of the California Independent System Operator, or ISO, which operates the state's who...

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