What was the cause of the biggest North American blackout in history, which occurred in the summer of 2003?
A) security breach
B) act of war
C) software failure
D) human error

Question

Quizplus · Accepted Answer

The biggest North American blackout in history, which occurred in the summer of 2003, was caused by human error. Specifically, a software bug in a control room monitoring system failed to alert operators to redistribute electricity after power lines in Ohio sagged into some overgrown trees. This event triggered a cascade of failures that eventually knocked out power to an estimated 50 million people in the northeastern US and parts of Canada.

What Was the Cause of the Biggest North American Blackout