So the power's gone off. Everything is suddenly dead, shops can't sell you anything since the electronic tills don't work, petrol pumps don't work, lifts don't work, traffic lights don't work, tap water won't last for long since the pumps won't work, mobile phones won't work, gas/electric heating won't work (and most oil and solar systems also need mains electricity to make them work unless they're off grid systems) - MN won't work!!
How long could you last with what you have?
There are no zombies, this isn'"t necessarily a "top yourself now - who would want to live?" scenario since the power could be restored at any time….or it could last months…