I want to know the answer to the following question:
When did the Computer Emergency Readiness Team investigate 79 hacking incidents at energy companies?
All the background I'm provided with is that "The Internet is a potential attack vector for such machines if connected, but the Stuxnet worm demonstrated that even equipment controlled by computers not connected to the Internet can be vulnerable to physical damage caused by malicious commands sent to industrial equipment (in that case uranium enrichment centrifuges) which are infected via removable media.". Is that enough to answer the question?