Errmmmmm hate to point it out to you buy when there is massive power cuts nothing is open, shops shut and cash machines definitely don't work.
I say this as someone who lives in a part of the country which regularly gets winter power cuts for several days!
Actual tips - we always make sure powerbanks are charged when storm warnings issued, have plenty of batteries, torches etc.
Have wood stored for winter and food supply - tins, dried food we can cook on the wood burner.
A lot of your list seems to be planning on a zombie apocalypse rather then power cuts!