The outage began shortly after noon on April 28 in Spain and lasted through nightfall, disrupting businesses, transit systems, cellular networks, internet connectivity and other critical infrastructure.

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.