Iberian Peninsula Blackout: The IT Impact

On April 28, 2025, a large-scale blackout affected Spain, Portugal, and part of southern France, causing severe disruptions to IT and digital systems.

Impacts on IT and Digital Systems

Communication network outages: mobile networks and the internet experienced major interruptions, making communication and access to information difficult.

Suspension of banking and payment services: ATMs and electronic payment systems were disabled, preventing financial transactions and access to cash.

Transport disruptions: rail and metro lines, including the Madrid metro, were evacuated due to power outages, blocking control and safety systems.

Hospital service interruptions: hospitals had to rely on emergency generators to keep critical systems running, such as intensive care and diagnostic equipment.

From the staff at Delphi Studio, an IT company in Valencia, we received reports of a power outage lasting about 12 hours. However, after power was restored, everything returned to normal and servers are operational again to continue Delphi code development.

Cause Investigations

Spanish and Portuguese authorities launched investigations to determine the blackout’s causes. The National Institute for Cybersecurity (Incibe) is assessing the possibility of a cyberattack, although early analyses suggest a technical issue or cable fault as the main cause. Portuguese energy company REN pointed to a rare atmospheric phenomenon called “induced atmospheric vibration” as a possible origin of the outage.

Service Restoration

By the evening of April 28, power was restored in many areas, with 99% of energy demand met in Spain and most substations operational in Portugal. However, the disruptions to IT and digital systems highlighted the vulnerability of critical infrastructure during prolonged power outages.

This event underscores the importance of strengthening the resilience of IT systems and communication networks by implementing security measures and emergency plans to ensure continuity of essential services during crises.