Ah, sorry, the WSJ link asked me to login, so I didn't read that article. A hundred rounds in 20 minutes though, seems like though this was planned, they weren't all that sophisticated, as it seems they may have been "hunting and pecking" for a vulnerable piece of infrastructure.
Regardless, I agree with AZ on more decentralization and redundancy being a better answer than more security. I've told the story a hundred times here, but during the Northridge, CA earthquake, I was without power for several days because of a node outage 100 miles away.