On March 12, 2014 the Wall Street Journal’s Rebecca Smith reported that an attack on just 9 key transformers could cause a nationwide blackout.
“The U.S. could suffer a coast-to-coast blackout if saboteurs knocked out just nine of the country’s 55,000 electric-transmission substations on a scorching summer day, according to a previously unreported federal analysis.
Rebecca Smith – “U.S. Risks National Blackout From Small-Scale Attack”
The study by the Federal Energy Regulatory Commission concluded that coordinated attacks in each of the nation’s three separate electric systems could cause the entire power network to collapse, people familiar with the research said.”
Below is the video report.