> Twenty eight seconds later, an electrical blackout had cascaded across Europe extending from Poland in the north-east, to the Benelux countries and France in the west, through to Portugal, Spain and Morocco in the south-west, and across to Greece and the Balkans in the south-east.
Parts of several countries were affected. Other parts had no outage. Depending on the view point, the blackouts a few years earlier in Italy and US were more widespread.
> Twenty eight seconds later, an electrical blackout had cascaded across Europe extending from Poland in the north-east, to the Benelux countries and France in the west, through to Portugal, Spain and Morocco in the south-west, and across to Greece and the Balkans in the south-east.
https://en.wikipedia.org/wiki/2006_European_blackout
There were even some TV documentaries about it, and in some areas it continued for days.