Spain and Portugal were the most impacted by the power cut, with ‘large areas’ experiencing outages. That included the cities of Madrid, Lisbon, Barcelona, Porto, Valencia, Seville and Bilbao. Andorra and parts of France were also briefly affected, however French grid operator RTE has said the network was operating again by Monday afternoon.

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

The agency also said it was continuing to work with all of its resources to restore power throughout the entire country as soon as possible. Red Electrica said early Monday morning the cause of the outage was being analyzed.