Well, there's some confirmation from 4chan's /pol WH Insider Anon's claims... the DOD is in fact planning a nationwide blackout and tweeted about it.
Click on the link and it send you to this article:
Snopes has made the claim that the Antifa protests are fake. Well, fine then. Have they debunked the planned black out?
Let's see what other news media is reporting...
From Newsweek is this:
There are protests arranged throughout the nation. Heavy has a list of cities to avoid if you've got better things to do.