Not even a week after we covered its stern warning, the DHS has begun scaling back the apparent severity of hackers in the grid. In stark contrast to the claimed ability to “throw switches” on critical equipment, the US Department of Homeland Security (DHS) has walked back the threat, saying that the only energy asset that hackers have managed to successfully access was a renewable energy generator that would not disrupt the grid if it was taken offline. At the National Cybersecurity Summit, DHS Undersecretary Christopher Krebs said explained the actual abilities, dousing the alarmist warnings that had appeared in the Wall Street Journal and public webinar. At the same show, Southern Company CEO Tom Fanning said that such cybersecurity…