Following the massive power outage in Spain and Portugal in April, an investigation report released on Tuesday revealed that the blackout was caused by a power surge. The power surge on April 28 triggered a chain reaction of protective shutdowns,

Spain's Energy Minister Sara Aagesen announced that a lack of voltage regulation in the power grid led to a substantial blackout in Spain and Portugal on April 28. The investigation revealed no cyberattack involvement.

Spanish grid operator Redeia disputed the findings of a government report that said failure by the operator to calculate the correct mix of energy was one of the factors that led to a massive blackout in Spain and Portugal on April 28.