USA Power Grid compromised?

Am I the only Network Admin wondering how this can happen and why its still
an issue if it was discovered in 2011?
Now I never worked in the Energy field so I am in the dark (pun intended I
guess) on how serious the Public utilities address these issues.
They should have redundant systems so they can clean (reimage, etc)
whatever is there and be done with it??

NSA chief admits China could cripple U.S. power grid, financial networks