[Nicky91]

and you can say but everything went out the same time


yes, that is a sort of ''Domino effect'' if you got faulty cables and those are all connected with each other, then yes, exactly this will happen



which also explains the moment the power restored again, maybe they found the culprit, and they replaced a cable, and then yes everything returns back to normal-ish

but my advice for the Red Electrica company would be try to prevent this from happening again, maybe some failsafes if possible idk, i'm no electrician but that should be possible i think, to place certain alternate power lines as a backup