A massive power outage has knocked out electricity across huge parts of Spain and Portugal, shutting off traffic lights and causing chaos at airports, train stations and on the roads.

Spain and Portugal have regained access to electricity after one of Europe’s worst blackouts paralysed transport systems, disrupted mobile communications and postponed medical procedures.

Millions across Spain, Portugal, and parts of France were thrown into chaos Monday after a massive power outage — blamed on a “rare atmospheric phenomenon” by some officials— crippled transportation networks,