By Pietro Lombardi MADRID (Reuters) -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.

A view shows Santa Llogaia electrical sub-station connected to the interconnection grid between France and Spain that tripped after a sudden, large drop in power supply and caused the major blackout in the Iberian Peninsula, in the village of Santa Llogaia d'Alguema, near Figueres, Spain April 29, 2025. REUTERS/Bruna Casas/File Photo

MADRID (AP) — Spain’s government said Tuesday that the massive April power outage across Spain and Portugal that left tens of millions of people disconnected in seconds was caused by technical and planning errors that left the grid unable to handle a surge in voltage.