Power was mostly restored across the Iberian Peninsula Tuesday, after a massive outage hit Spain and Portugal, grounding aircrafts, and disrupting traffic.

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

A massive power cut hit large parts of Spain and Portugal on Monday, causing widespread chaos and disruption. The outage left millions of people without electricity, while internet and phone networks were also down. Trains were cancelled and evacuated in some regions, traffic lights stopped working amid mounting delays at airports.