Power outages disrupted daily life and left millions of people in the dark. Tens of millions of people on the Iberian Peninsula had their Mondays upended by power outages that lasted hours.

A failure of the interconnection between the grids of Spain and France caused the massive power outage that hit most of the Iberian Peninsula on Monday, La Vanguardia newspaper reported, quoting Spanish grid operator REE's system operations chief Eduardo Prieto.

Several airports, including Madrid airport, which is Spain's busiest, had no electricity, El Mundo reported. Major cities including Barcelona, Seville and Valencia were without power. Parts of France were also affected by power loss.