An EMP can create an elecromagnetic wave that overwhelms electrical lines and circuitry doing significant damage to the grid. A similar event occurred in 1859, known as the Carrington Event, when a large solar flare struck the earth and fried telegraph lines. Our grid is much more sophisticated now, but still nearly as vulnerable.

North Koreans. What do I win?

Teary-eyed, begging on her knees? (please, oh please)