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How many days have you got if the electricity goes? (About 3, again, huh!)
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Well, yes and no.
If it's only electricity that's down, stores can still be resupplied, but frozen foods may not be available unless the store has its own generator and is being supplied with fuel.
If something has caused a powergrid failure that will last more than two days there is a temporary solution. If there are rail tracks near enough, one or two diesel locomotives can be used as portable 1.5~2.5 Mw generating plants by connecting them into the grid. Power can then be turned on to sections at a time for an hour or so in turn.
The biggest problem is when some disaster engulfs a large area where roads and airports are unusable. Heavy snow, flooding, earthquake and the like can cut an area off from outside supplies.