Everyone in all 50 states should realize that rolling brown outs are possible for any reason. All that is necessary is for the electric usage to be equal or greater than the electric production. Sometimes that occurs when an electric plant goes off line perhaps because a coal train didn't arrive on time , or due to high heat or extreme cold. If you have a medical reason why you shouldn't have your electricity turned off for any reason, notify your electric company. They can flag your house in some way so that your electricity won't be cut off during a rolling brown out. They don't want people having a medical crisis because equipment couldn't work. You have to notify them ahead of time.