Iberian outage investigation, June 6 update by ENTSO-E
Data collection continues, next steps identified, webpage established
A panel of European experts in grid operation is investigating the April 28, 2025 blackout in Spain and Portugal. They will write a report, issue it to stakeholders first, and then distribute it to the public.
The group is investigating the oscillations on the system that were more than the grid’s monitoring system would allow. Disconnecting from the grid was the system’s failsafe path to protect equipment.
June 6, 2025 Press Release
Read the entire press release at this link:
Here is the second paragraph of the press release:
“The Panel is currently collecting all the data needed to establish the facts related to the incident. This data will help understand, among other things, the oscillation phenomena which occurred before the blackout. The investigation is focusing on a number of questions, including on determining what triggered the initial generation trips in Southern Spain, and why the Spanish and Portuguese System Defence Plans were unable to halt the process that led to the full blackout of both countries.” (emphasis added by Richard Rusk)
Webpage on the outage and investigation
The webpage contains a preliminary chronology of events, the restoration process, a description of the investigation and a list of the investigators, and links to other documents.
Iberian Peninsula Blackout of April 28, 2025
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