Reacción a "Final blackout report by European operators confirms event was caused by multiple factors, recommends improving oversight and coordination"

Is the report based on sound data and methods?

“Generally speaking, yes. My initial impression is that the report is based on a broad technical foundation and an appropriate methodological approach for analysing a large-scale power disturbance. It incorporates operational chronology, system records, dynamic analysis, a review of protection behaviour, and an assessment of the response of various network and generation components. Furthermore, I consider it methodologically significant that it does not seek a single or simplified explanation, but rather presents the incident as the result of several concurrent factors.

That said, it should be emphasised that the report itself acknowledges certain limitations in the information available and the absence of specific records. I therefore regard it as a technically sound and useful document, but not as a reconstruction that is absolutely definitive in every detail.”

What new insights does it provide?

“In my view, the main new insight is that the report moves beyond a mere chronological description of what happened towards a more developed causal interpretation. In other words, it does not limit itself to reconstructing the sequence of events, but rather attempts to explain the technical mechanisms involved in the blackout and how they were linked together. I find it particularly significant that the report focuses on voltage stability, the actual capacity for reactive power control and the interaction between different elements of the system, rather than reducing the explanation to a single variable. It also provides a more detailed insight into the role of prior oscillations, successive generation disconnections and the coordination between the transmission grid, distribution network and different generation technologies”.

What data would you highlight?

“I would highlight, above all, five main ideas. Firstly, that the report does not identify a single cause, but rather a combination of technical factors that converge in a highly complex incident. Secondly, that a central part of the explanation shifts towards voltage behaviour and the system’s ability to withstand rapid disturbances, rather than towards simplified interpretations based exclusively on inertia.

Thirdly, the report highlights the importance of effective reactive power margin and voltage control as key elements in containing situations of this kind. Fourthly, it analyses the sequence of generation disconnections and how these contributed to exacerbating the incident’s progression. And, fifthly, it highlights that in increasingly complex power systems with a growing presence of resources connected via power electronics, monitoring, coordination and technical requirements are becoming ever more important”.

Are there any significant limitations to bear in mind?

“Yes, and I believe it is important to highlight them to avoid exaggerated interpretations. The first is that the report itself acknowledges that not all records were available at the same level of detail, so some conclusions must be read with the caution befitting an investigation of this nature. The second is that this document should not be used as if it were a simple attribution of responsibility or a definitive ruling on a single party. It is a technical analysis of a highly complex event, not a legal or punitive assessment. The third is that the report should not be turned into evidence in favour of single-cause explanations, whether to blame a specific technology or to deny the technical challenges posed by the transformation of the electricity system. The value of the report lies precisely in showing that the incident was systemic and requires a broad technical analysis".

What practical recommendations can we highlight based on this report?

“From a first reading, I would highlight several practical recommendations. The first would be to continue strengthening the system’s voltage control capacity and the effective availability of reactive power, as the report suggests these elements were particularly relevant during the incident. The second would be to review and refine protection criteria and their coordination, so that the system can respond more robustly to rapid and complex disturbances. The third would be to improve operational visibility and real-time monitoring of the behaviour of the various connected resources, including those playing an increasing role in the current electricity mix.

The fourth would be to continue adapting the system’s technical and operational requirements to a context in which power electronics and the transformation of the generation fleet are becoming increasingly significant. And the fifth, perhaps the most general, would be to interpret this report as an opportunity for technical learning and for strengthening the system’s resilience, rather than as a basis for simplified or excessively polarised interpretations.

Overall, my initial assessment is that the ENTSO-E report provides a valuable technical basis for better understanding a highly complex incident. I find it particularly useful because it helps steer the debate towards issues of stability, control, coordination and adaptation of the electricity system, which will become increasingly relevant in the future. Precisely for this reason, I believe it should be read rigorously and with caution, avoiding both oversimplifications and overly categorical conclusions.”