I think the thing that makes this so effective is, even for how dated it can seem, it feels very realistic in both what happens and how matter of fact it presents it. People are obviously distressed but don’t come off as melodramatic (if I remember right). The local authorities gather and dutifully try to execute emergency protocols and, true to life, are mostly ineffective. And then end up dead. And the post apocalypse scene seem realistic as well. Society doesn’t go away completely, it just reverts back to the 1800s once all the infrastructure has collapsed.
I dunno what the lightning in the bottle is here specifically, but it’s a well crafted, well acted, well paced and believable scenario from that time period and I think it holds up very well. And The Day After isn’t bad at all either, it just feels more Hollywood. I bet if Nic Meyer weren’t making it for TV, it would’ve been darker. But it’s still pretty bleak.