San Diego blackout caused by grid protection failures, regulators find
Nuclear Regulatory Commission photo
The massive San Diego blackout last fall was caused in part by grid protection systems that failed to isolate a failed transmission line in Arizona, along with poor planning and lack of coordination among electricity managers, federal regulators concluded Tuesday.
The failure of the Hassayampa-North Gila line led to overloads that started a series of shutdowns over 11 minutes that ended in the blackout, the Federal Energy Regulatory Commission and the North American Electric Reliability Corporation said in releasing the results of their joint inquiry.
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