After an electricity blackout plunged Spain and Portugal into darkness, France remained largely untouched. But how vulnerable is the country to such an event? View on euronews

Red Eléctrica, Spain’s electricity grid operator, ruled out a cyberattack, human error or unusual weather. Experts say it could take weeks to determine the cause.

Electricity has returned to most of Spain and Portugal but with continued disruptions on the second day after an unknown failure caused a massive blackout across much of western Europe.