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Europe's Largest Blackout in 20 Years: Causes Revealed

10/5/2025

42 9 Full Breakdown

Summary

Story summary

The April 28 blackout hit Spain and Portugal, Europe’s largest outage in more than 20 years.
The European Network of Transmission System Operators for Electricity (ENTSO-E) reports cascading overvoltages caused outage.
Investigations faced data-collection challenges, with some Spanish power companies resisting information sharing.
A final report is due in early 2026 with analysis, recommendations, and steps to improve resilience.

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Story summary

The April 28 blackout hit Spain and Portugal, Europe’s largest outage in more than 20 years.
The European Network of Transmission System Operators for Electricity (ENTSO-E) reports cascading overvoltages caused outage.
Investigations faced data-collection challenges, with some Spanish power companies resisting information sharing.
A final report is due in early 2026 with analysis, recommendations, and steps to improve resilience.