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

Spain and Portugal experienced a widespread power outage on Monday, leaving millions without electricity in a snap blackout. In Portugal, official sources told domestic media that the outage, which hit around late morning local time,

See photos of the massive power outage that affected millions of people in Spain and Portugal due to an "induced atmospheric vibration."