After experiencing the covid-19 outbreak I am now fully convinced that a zombie apocalypse is feasible, there would be people denying the existence of the zombie virus, just going to the infected an getting bitten because they wanted a pizza or something, that and people just drenching themselves in bleach or something because they heard that keep the zombies away from some dude online. Stuff like that.

Isn't that the case in the 28 X later series? Like England fell to a zombie apocalypse but the rest of the world is doing fine?

Any country with competent leadership could have squashed the zombies in a couple months.

True but you underestimate people stupidity.

I’ve always thought that if I’m in a zombie apocalypse im just gonna carry super soakers filled with hydrogen peroxide

Not sure, though, how this ploy would work out for our fine fellows in South America and Canada, the ones currently belabored with being the closest neighbours...

Fuck Mexico, I guess.

Just uhhh... Build a wall, I guess?

It is a little more complex than that. You cannot only consider how big is a country or how big is its grid.
If the Europe would be hit by a solar storm, assuming that not all of it was hit we can recover the grid in about a month and the blackout would not be longer than maybe a week.

But a solar storm would destroy also everything else, so how big is the grid is really irrelevant when you basically have every other piece (excluded the few hardened enough) destroyed.