If you wait until the power is out to do your canning, you will be too late. You might have the ability to can without electricity, but probably not the time for it then.

I have a freezer and it is full of food, mostly staged for when I have a block of time to process. This next weekend looks like a good opportunity. I should end up processing at least 60 pints of meat in the canners if all goes as planned. I also plan on making at least 30 lbs of sausage. That may or may not happen. But if not, I can probably do it during the week next week.

Not everything goes in the grinder or gets canned. Steaks, frying chicken, fresh sausage, and roasts stay raw in the freezer until time to cook. A few salmon fillets stay in the freezer, and a couple roasting turkeys, ducks, and goose have to stay in as well. That's still a lot of food to leave at risk if the power goes out. But hey, even I like a little fresh meat once in a while. I are a Texican, after all.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)