This will never happen, but what if all the electrical power companies that use coal to create the electricity they sell went on a 24 or 48 hour strike. They all announce that beginning on a specific date, they will turn off their generators and shut down the furnaces and thus stop POLLUTING WITH DIRTY NASTY UNWANTED COAL. And it would be good to do this either in the winter when it is coldest or during the hottest days of the summer and see what Nannayor Bloomberg thinks about sitting in his sealed window office without air conditioning.
or f'got to pay the electric bill
or thought you did, but didn't
or the gas guage was broken on your car and you miscalculated
or
They would go to jail. They do have (at lest the regulated segment) a legal duty to provide power if possible. To intentionally shut it down would be a crime. The un regulated segments (the Independent Power Producers) have contractual obligations with very stiff non-performance penalties.