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Spain Rejects Grid Experiment Claims, Points to Conventional Plants in April Blackout

Investigators continue probing the blackout’s unknown cause, scrutinizing voltage irregularities, urging deeper data transparency from energy firms

Un homme et un enfant dans un marché couvert plongé dans le noir lors de la panne électrique massive du 28 avril 2025, à Vigo, dans le nord-ouest de l'Espagne
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Overview

  • Spain’s Ecology Minister Sara Aagesen told Parliament that claims of grid experimentation are “totally false,” denying any government-led tests before the April 28 blackout.
  • Beatriz Corredor, president of Red Eléctrica Española, dismissed theories of excessive renewables, cyberattack, short-circuit or overload while identifying voltage control irregularities in conventional power plants.
  • The Association of Spanish Electricity Companies reported no defects in member installations and urged REE to provide full data to all stakeholders.
  • Spanish authorities logged two strong electrical oscillations 30 minutes before the outage, followed by three rapid substation failures in Granada, Badajoz and Seville.
  • Investigators say the blackout’s root cause remains unknown as they focus on voltage anomalies and transparency in the ongoing inquiry.