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Spain’s blackout caused by over-voltage cascade, oscillations, generation loss (update*)

By Eleonora Rinaldi ( October 3, 2025, 09:32 GMT | Insight) -- The April 28 blackout resulted from a cascade of over-voltage events triggered by oscillations and a sudden loss of power generation in Spain, according to an investigation by the European Network of Transmission System Operators. Mandatory voltage controls for all technologies, renewable and non-renewable, should be required, Entso-E said. A second “political report,” with policy recommendations, is expected in the first quarter of 2026.The April 28 Iberian blackout was caused by cascading over-voltage events triggered by sudden oscillations and the loss of “reactive power” from disconnecting generation assets, Entso-E said in a report on Friday (see here)....

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