Yes...you can still use Bitcoin when the power goes out.
Its actually very straightforward...
Its explained here:
https://dumbanddumber.fandom.com/wiki/IOUS
YOU might be able to utilize it. The guy who has goods you want might not so, and he’s probably looking for something physical or utilitarian for giving up his goods.
I have yet to sway from my long held notion that crypto only has value in a functioning society.
Anyway, the whole point of bitcoin is not to walk around and spend it like it’s a debit card. If the power goes out, and it’s the end of the world as we know it, it’s there to rebuild your life when the power comes back on. Also it’s doubtful that the power goes off in the entire world at one time. So you arrive in Argentina, or wherever, and walk into a bank and use your bitcoin. You don’t even need any card, if you memorize the key, you can leave the country with all your bitcoin without any physical thing they can search for and find.
I don’t see anything there.