Sadly, I think it is just one more area where Countries have to worry about. It is good that they are having these war games. To have a cyber-attack take out the power grid on the East Coast of The U.S. would to tremendous damage to the Country even if it is down for a short period of time.
I am the IT Director for a small municipality and I spend about 80% of my day on security related issues for my network. Pity that I have to put so many resources to this but that is the reality we live in.