CNN
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Electricity is pulsing through Spain and Portugal again after a massive outage knocked out power in both countries on Monday. So too are questions.
It remains unclear what caused the sudden and staggering blackout, which plunged tens of millions of people into darkness and paralyzed life on the Iberian peninsula.
Authorities are investigating whether a freak event, a cyberattack or some other cause is to blame, while airports and train stations are catching up with a huge backlog.
Here’s what you need to know.
Spain’s electrical grid was running as normal until 12:33 p.m. (6:33 a.m. ET) when, suddenly, it…
