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.

BARCELONA, Spain (AP) — The blackout that engulfed the Iberian Peninsula on Monday was chaotic and stressful for many. But it had a silver lining: People were forced away from their screens and into the “real” world, connecting with the present and one another. Some Spaniards and Portuguese embraced their day without power.

Travelers delayed by Monday's outages crowded train stations on Tuesday trying to go home though schools and offices reopened and traffic eased along main roads.