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

It may take a week for the network servicing both countries to be fully repaired. Meanwhile, millions are without power.

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,