Spain's Energy Minister Sara Aagesen said a report about an investigation into the causes of the blackout that hit the Iberian Peninsula on April 28 will be released later on Tuesday afternoon. She told a news briefing the report concluded there was no evidence that a cyberattack had caused the outage.

Spain has identified the causes of the historic April 28 electricity outage and signaled that it was due to a lack of capacity to control voltage changes.

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,