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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.
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Even as electricity was restored across Spain and Portugal after a daylong blackout, residents tried to make sense of 18 hours of the "insanity."
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 Electricity was restored to almost all of Spain and Portugal on Tuesday morning following a massive power cut affecting the entire Iberian Peninsula, but the cause of the blackouts remained a mystery.
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