They didn't cut power to neighborhoods with a police/fire station (I have a friend in Texas who wondered why his power didn't get cut). I don't know about hospitals. But hospitals usually have their own emergency generators.

BTW, the power to my house can be remotely and individually shut off any time the power company wants to (when they upgraded my meter). There's no reason this can't be used to shut off the fixed rate customers and leave the variable rate ones on.