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50 Million Hit as Europe's Grid Fails in 90 Seconds
24 Mar
Summary
- Iberian power grids collapsed in under 90 seconds on April 28, 2025.
- The blackout affected over 50 million people across Spain and Portugal.
- Multiple interacting weaknesses, not a single failure, caused the crisis.
The power grids of Spain and Portugal collapsed in less than 90 seconds on April 28, 2025, affecting over 50 million people. This unprecedented event, described as Europe's most severe blackout in two decades, resulted in outages lasting up to 16 hours in some Spanish regions and 12 hours in Portugal. A 49-member Expert Panel's final report concluded that the collapse stemmed not from a single failure, but from multiple interacting weaknesses.
The cascade began with rising voltages and rapid disconnections of renewable generation, totaling over 2.5 GW in about 78 seconds. These disconnections amplified voltage increases, triggering further failures. Existing defense plans, designed for frequency threats, were unable to counter this fast, overvoltage-induced collapse. Restoration efforts faced challenges, including communication failures and difficulties with black-start units.
The Expert Panel recommended modernizing defense plans and addressing systemic weaknesses in voltage control, oscillations, and generator disconnections. The report highlighted that the root causes were similar to a 2024 incident in southeast Europe. Recommendations emphasize improved reactive power reserves, better coordination of renewable output, and proactive regulatory oversight to ensure compliance and grid security.
