“U.S. power grids and other civilian infrastructure are not prepared for electromagnetic pulses that could result from weapons or violent space weather, according to testimony at a congressional subcommittee hearing Wednesday.
Panelists at the House Homeland Security Subcommittee on Cybersecurity, Infrastructure Protection and Security Technologies, told Chairman Dan Lungren R-Calif., that there were serious flaws in the nation’s infrastructure that could allow for EMP events to shut down power and communications for extended periods of time.”
Source: Electromagnetic pulse could knock out U.S. power grid – Nextgov.com