How One Mistake Can Leave Millions Without Power

San Diego's power company has restored power to all of its customers. Thursday afternoon, more than 4 million people in the Southwestern U.S. and parts of Mexico lost electricity. Arizona Public Service Company says the outage occurred after an electrical worker mistakenly removed a piece of monitoring equipment at a substation in southwest Arizona.

Source: http://www.npr.org/2011/09/09/140341743/how-one-mistake-can-leave-millions-without-power?ft=1&f=1007

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