[amval]

Apparently this spans more countries? Very strange. Possibly a cyberattack or sabotage?

Growing up in Spain I've never experienced anything like this (not there at the moment, but friends have told me over WhatsApp).

[voidUpdate]

Possibly some kind of rare cascade failure where it might have been on the edge for a while, and some small event happened that tripped things, similar to the american northeast blackout in 2003. High demand, plus a power station going offline meant more demand on some interconnects, which shorted on trees and were cut off, putting more load on other lines until the entire system collapsed

[ksec]

Continental Europe Synchronous Area [1]

The whole Europe power grid are somewhat interconnected I wont be surprise if this knock on effect start knocking out other surrounding countries.

[1] https://en.wikipedia.org/wiki/Continental_Europe_Synchronous...

[HeatrayEnjoyer]

Is that a risk with the small amount of interconnect capacity?

[cr3ative]

Grids are widely interconnected. Problems on one grid can and do cascade to another.