now......
if something happened that the entire countries grid(s) went down....or even saaaayyyy.....just 1/3 of it.......there would be almost immediate rioting/looting. it would take at LEAST a week for any branches of the military to begin any form of effective patrolling. this would however be useless, as they are severely outnumbered, even when combined with the local/county/state law enforcement agencies.
initially the rioting/looting will be just the same crap we've seen in the past with the blantifa morons. once they've realized that power's not coming back anytime soon, then the real "fun" starts, and many will die. the blantifa morons first, as they're not prepared for the resistance they'll encounter when they try raiding someones home and taking their food, followed by those who thought that they didn't need any specific tools or training as they squirl'd away their food/med supplies.
this will take less than a month. and depending on what's been damaged to take it all down, it will be months or years before reliable power's restored