The blackout hit critical infrastructure like airports and caused transportation disruptions across the two countries. The cause of the outage was unclear.

Power Outage Brings Spain, Portugal and Parts of France to Standstill |Vantage with Palki Sharma A massive blackout has hit Spain, Portugal and parts of France. The power outage has impacted millions of people.

Millions of people in Spain, Portugal and parts of France lost power on Monday due to an unknown grid issue, the Spanish government told ABC News.