The US terrorism alert level has not been raised, and there are no US terrorism alerts from Homeland Security following this.[1] PJM and CAISO (the two biggest US power grid operators) aren't showing any emergency actions or warnings. So the US anti-terrorism community isn't seeing an imminent threat.
[1] http://www.dhs.gov/news/2015/11/13/statement-secretary-jeh-c...
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