Aside from covid of course…
My prediction is a texas-style grid failure but with a wider scale. Where I live, the electrical infrastructure is crumbling and there were a number of 1-2 day long outages this year which is new. Also a generally very poor area so little resources or motivation to fix or reinforce anything.
Fuck the GDP cost, there is no fucking way in hell society ever recovers from the universe deciding to flip the switch on the electrical grid to off.