Spain's national grid operator Red Eléctrica de España has ruled out a cyberattack and pointed to a drop in solar generation as the preliminary cause of the country's power outage, El Pais reports.

Electricity was back in most of the two countries almost 18 hours after a blackout that shut down much of daily life. The cause of the outage remained unclear.

Spain and Portugal held emergency Cabinet meetings as evacuations from some public spaces took place. Spain's Interior Ministry has declared a state of emergency for affected regions that need it. Follow DW.