Power returns to Spain and Portugal as outage cause remains a mystery

Crowds of passengers at Sants station in Barcelona on Tuesday (Emilio Morenatti/AP)

The cause of Spain and Portugal’s widespread blackouts remained a mystery on Tuesday, with some isolated disruption remaining after power was largely restored.

One of Europe’s most severe blackouts grounded flights, paralysed train systems, disrupted mobile communications and shut down ATMs across the Iberian Peninsula on Monday.