That blackout was caused by a tree limb in Ohio, but it always seemed likely to me that the Blaster/Welchia worm either was a contributor or magnified the impact of the grid issues.

I worked next to a power plant that shared some network components with my employer at the time. They did an emergency shutdown minutes before we were impacted by blaster. Some of our upstream providers operating backbones in NY also were impacted and had capacity issues due to the worms. At least one of those providers had issues for days after the initial incident.