Electricity is pulsing through Spain and Portugal again after a massive outage knocked out power in both countries on Monday. So too are questions.

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.