Overview

• Electricity supply in Spain and Portugal has been restored to over 99%, with normal operations resuming across most sectors.
• The blackout, which began on April 28, caused a sudden loss of 15 GW—about 60% of Spain's electricity demand—in under five seconds.
• Transport systems, including metros, trains, and airports, were paralyzed, leaving thousands stranded and disrupting daily life.
• Three Spanish nuclear reactors automatically shut down and operated on backup diesel generators as a safety measure.
• Authorities are investigating the cause of the outage, with no conclusive findings yet but cyberattack scenarios ruled out.