Much of Spain’s power grid was operating normally on Tuesday, a day after a blackout affected critical infrastructure across the Iberian Peninsula.

Panic-buying has spread across Spain and Portugal after a major power cut left vast amounts of the nations at a standstill on Monday. At least 50 million people across the Iberian peninsula have been affected after metro and train lines were suspended,

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