The sweeping power outage that hit Spain and Portugal this week has raised questions about the electricity grid in a region not normally known for blackouts. Monday's outage, one of the worst ever in Europe,

Spain's national grid operator Red Eléctrica de España has ruled out a cyberattack and pointed to a drop in solar generation as the preliminary cause of the country's power outage, El Pais reports.

No electricity, no communication, and in some cases, no running water – that was the situation from around 11:30am yesterday in Portugal and Spain, following a widespread blackout. Many people were unable to work,