It sounds like a science-fiction disaster: A nuclear weapon is detonated miles above the Earth's atmosphere and knocks out power from New York City to Chicago for weeks, maybe months.
Panel: Electrical grid vulnerable to terrorist attack
Experts and lawmakers are increasingly warning that terrorists or enemy states could wage that exact type of attack, idling electricity grids and disrupting everything from communications networks to military defenses.
The Federal Energy Regulatory Commission is pushing Congress for authority to require power companies to take protective steps, which could include building metal shields around sensitive computer equipment.
There is growing concern over the possibility of an EMP attack on the US. With Obama's abrogation of the missile defense promised to Eastern Europe, and his appeasement of Russia and Iran, the danger of a EMP attack is heightened. For more details on EMP, see here. Clearly, the Damocles Sword has inched closer.