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Spain's weak voltage control was key factor in 2025 blackout, industry body says

By Louis de Briant ( March 20, 2026, 13:52 GMT | Insight) -- Weak voltage control in Spain’s power system was a key cause of the April 28, 2025, blackout affecting Spain and Portugal, the trade association for European electricity transmission system operators has said. It has called for stronger operational practices, improved monitoring and closer coordination among grid operators, and urged regulators to adapt to the evolving electricity system.Deficient voltage control in the Spanish power system was one of the key causes of the huge blackout in Spain and Portugal on April 28, 2025, the trade association for European electricity transmission system operators has said....

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