The overvoltage-driven blackout of the Iberian Peninsula on 28th April 2025

Key Points

• The blackout was triggered by overvoltage conditions, severely impacting the power grid across the Iberian Peninsula.
• Data indicated that voltage levels exceeded safe limits, with a notable spike observed only hours before the outage.
• Assessment of grid conditions prior to the event showed inadequate voltage regulation and monitoring systems in place.
• This event highlights critical vulnerabilities in the power grid, calling for improved safety measures and regulatory oversight.