Spanish authorities say the massive power outage in April across Spain and Portugal was due to technical and planning errors that led to a cascade of failures in the grid.

Spanish grid operator Redeia blamed power plants for the massive blackout that affected the Iberian peninsula in April, as it disputed a government report that said its failure to calculate the correct energy mix was a key factor.

MADRID (Reuters) -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.