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Iberian blackout is first blackout caused by over-voltage

In a report published on Friday, the European Network of Transmission System Operators ENTSO-E stated that the massive blackout which hit the Iberian Peninsula in April was the first blackout known to be caused by over-voltage.

This first report was released before a legal deadline of Oct. 28, and focused more on the state of the power system that day, as well as the sequence of events.

Like previous investigations, the report points to a surge of voltage as the immediate reason for the outage.

The final report will be published by the first quarter next year. It will examine key issues such as root causes, the actions taken to control voltage and the performance of the power generators to help control voltage. MISSING DATA & UNEXPLAINED POWER GENERATION LOSES

According to the report, it is not known why some of the initial losses in power generation occurred.

According to the report, some important data remains missing, in particular, related to certain generation trips that occurred before the blackout.

It added that the owners of power plants claim they do not have such data.

The report states that "collecting complete and high-quality data proved to be very difficult for this investigation", in particular, from power operators in Spain. Reporting by Kate Abnett, Pietro Lombardi and Inti Landauro. Editing by Inti.

(source: Reuters)