On April 28, 2025, a major power failure swept across the Iberian Peninsula, interrupting electricity supply to millions of customers in Spain and Portugal. The event drew immediate attention to the resilience of an increasingly complex regional grid.
This overview reviews the available information on the sequence of events surrounding the failure and considers the technical and operational factors relevant to understanding how such a widespread outage could occur.
The analysis situates the incident within the broader context of grid reliability, examining the considerations that policymakers and system operators should weigh as electricity systems continue to evolve.
From the EPRINC Chart of the Week archive.