[bhousel]

So I suppose my original comment should have just outright asked: What can a hacker actually do with (hypothetical) remote access to the electrical infrastructure? Open switches under load to effect an arc blast? Blow up a few substations?

Once hackers start mucking around with the grid, things start shutting down by themselves (cascading failures like in the 2003 blackout that you mentioned in another comment). In this situation, damaged equipment can be replaced fairly quickly (far quicker than if, say, a $60 billion storm throws trees across the wires).

I guess I was just looking more for responses from actual electrical engineers with knowledge of the problem. Otherwise we're all just talking out our collective asses, right?