EuroCommerce, the European association for retailers and wholesalers, is urging consumers to stay calm and avoid panic buying.
In a statement, EuroCommerce said that retailers and wholesalers are collaborating with local authorities to manage the ongoing disruption caused by the blackout.
While some stores may temporarily close as power is restored, efforts are being made to ensure the safety and security of both consumers and staff.
The association also highlighted that, while the full extent of the outage is still being assessed, disruptions to payment systems and store operations are already being reported, along with a rise in misinformation.
Media reports have shown long queues at supermarkets, with shelves being cleared as shoppers fear the possibility of extended power outages.
The power failure, which has affected large areas of both Spain and Portugal, has disrupted daily life, including transportation, businesses, and homes, according to Reuters.
