Is any of the electric grid even publicly accessible over the internet? Surely there isn't a big "off" button for the power grid, as its quite a distrubted system... Furthermore I really doubt the infrastructure for these is publicly accessible over the internet. Even so, it seems like physical security would go a much longer way than network in the case of utilities.
As for markets, well there is a tiny agency called the SEC.
Either way this security is a cost to be borne by industry...Not ran by state military agencies.
Let's just call this for what it is, a power grab for defense/infosec contractors, and career officers. :)
To that end I'm not surprised to see it so vehemently defended by infosec professionals.