Officials in Spain and Portugal are racing to restore electricity after a huge power outage that grounded flights, paralyzed metro systems, disrupted mobile communications and shut down ATMs, upending the lives of tens of millions of people and turning airports and train stations into campgrounds for stranded travelers.

Power has mostly been restored to cities across Spain and Portugal after a major outage caused chaos yesterday. Flights, traffic lights, trains and phone networks have all been affected as the fallout continues.