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Hey #EnergySky, are there any good explanations of why voltage would rise after the first generation trip in Spain as ENTSO-E reported? Best I can think of would be that loads were light, so transmission lines were producing reactive power which was being consumed by those generators to hold V down.

entsoe.euENTSO-E expert panel initiates the investigation into the causes of Iberian blackout

15/5/25, 5:45 pm0 reposts1 like

Matthias Fripp

@matthiasfripp.org

15 May 2025

It doesn't look like frequency or RoCoF got low enough to trip generators, but they tripped anyway before underfrequency load shedding could rebalance the grid. Maybe overvoltage was the final straw? The Spanish government seems to be saying so. (And by the theory above UFLS would have worsened it.)

linkedin.comUPDATE SPAIN BLACKOUT: The Spanish gov has published the most detailed… | Javier Blas | 45 commentsUPDATE SPAIN BLACKOUT: The Spanish gov has published the most detailed timeline yet of the April 28th blackout of the Iberian Peninsula. Lots of emphasis on "over voltage" and "frequenc...