"If the solar storm of 1921, which has been termed a one-in-100-year event, were to occur today, well over 300 extra-high-voltage transformers could be damaged or destroyed, thereby interrupting power to 130 million people for a period of years."
-Joseph McClelland, director of the Office of Electric Reliability
at the Federal Energy Regulatory Commission, May 31, 2011, House Energy subcommittee hearing