Red Electrica, Spain's power operator, says that as of 06:00 local time (05:00 BST), 99.16% of power has been restored to mainland Spain. "All substations on the transmission grid are operational. We continue with the restoration work," the operator says.

Power began returning to households in Spain and neighbouring Portugal, hours after cities across the Iberian Peninsula were plunged into darkness in one of Europe's most severe blackouts.Investigators are still looking into the cause of the blackout which remains unclear,