Here's the PERFECT scenario......
I am surprised that Iranian or ANTIFA or other radical bastards have not yet gone out to one of the major power substations outside the city that are usually only protected by a chain link fence with a 30-06 or similar an started firing lead into the transformers which are sitting ducks. A dozen or so rounds fired into a transformer, bullets penetrate, SHORT OUT PRIMARY AND SECONDARY WINDINGS inside, transformer BLOWS UP, no power for DAYS as these huge transformers are VERY difficult to replace. In the meantime with NO POWER and 100°F heat society quickly breaks down and all hell breaks loose....
There you go! An very easy to do with a dozen or so rounds fired into one of those High Tension Substations located in the middle of nowhere. an in this heat with the load those transformers are under the will go up like a frickken nuclear bomb if their windings are shorted out under full load!!