“Grid operators in both countries areworking on finding the cause, and on restoring the electricity supply,” Costa postedon X.
— António Costa (@eucopresident) April 28, 2025
The outage, which began around 12:30 p.m.local time, crippled transport networks, disrupted mobile services and bankingoperations, and halted metro systems. Major cities, including Madrid and Lisbon, reported suspended metro lines, disabled traffic lights, airport delays, andinterruptions to events such as the Madrid Open tennis tournament.
Partial restoration has been reported innorthern and southern Spain. Portugal’s grid operator REN attributed theblackout to a “rare atmospheric phenomenon” that caused “anomalousoscillations” in Spain’s high-voltage transmission lines, triggering cascadingfailures across Europe’s interconnected grid.
REN also cautioned that full normalizationof the grid could take up to a week, citing the technical complexity of thedisruption.
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