So if the electricity supply went off for good

[Tartar Horde]

If the electricity went off for good the above list would be the last of our worries. Without electricity we are looking at an ELE (extinction like event) for the majority of Humans, fauna and flora. I have posted about this before regarding the meltdown of most of Earths nuclear reactors, when the back up systems run out of fuel (mainly diesel) the pumps will not provide coolant (mainly water) and those reactors will overheat and ignite, even if they are shut down they still generate heat that needs to be dissipated. TPTB do not budget for a complete loss of power, as they always assume there will be enough time before the backups fail to get the primary power source going again. It is insanity and gross arrogance on their part not to prepare for the one scenario that is the most dangerous to life.
To those folks who might like the idea of collapse, and who see a "brave new world" after the event, be very careful what you wish for.