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 massive power outage is impacting Spain and Portugal, knocking out key services and forcing the evacuation of subway systems in both countries, reports say.

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.