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Net Up, Phones Busy in Blackout: Page 4 of 4

The cause hasn't been determined, though speculation centers on a series of cascading circuit failures and subsequent overloads on the grid. The North American Electric Reliability Council is holding a press conference this morning to discuss the issues so far.

According to that organization's Website, the outage is the largest to hit the continent since widespread outages hit the Western U.S. and Canada, affecting 7.5 million customers, in July 1996.

Mary Jander, Senior Editor, and R. Scott Raynovich, US Editor, Light Reading, with additional reporting by Todd Spangler, US Editor, Byte and Switch