A widespread power cut on 28 April disrupted millions across Spain and Portugal, prompting investigations and huge public concern. Portugal’s national grid operator, REN, attributed the blackout to a rare atmospheric phenomenon which caused extreme temperature shifts, leading to unusual oscillations in electrical lines. This explanation contrasts with speculation in Spain about a possible cyber attack, which their national security agency is still investigating. There is still no clear explanation of the disruption. It brought significant consequences: public transport stopped, mobile networks failed, and contactless payment systems were disabled. Panic buying swept through supermarkets, echoing scenes from the Covid pandemic. Three deaths have also been recorded in Spain. REN said recovery could take up to a week, though prime minister Luis Montenegro predicted that it would be quicker.