Cause of Spain and Portugal blackouts which left millions in the dark revealed

The blackout left millions without power due to ‘grid failures’ (Picture: AFP)

Six weeks after Spain and Portugal suffered a massive power outage, authorities in Madrid said the blackout was caused by technical and planning errors.

Spanish ecological transition minister Sara Aagesen, who manages the nation’s energy policy, said at a press conference that small grid failures, concentrated in the south of Spain, led to a chain reaction before the blackout.

Larger grid failures followed the small ones...