Red Eléctrica, Spain’s electricity grid operator, ruled out a cyberattack, human error or unusual weather. Experts say it could take weeks to determine the cause.

MADRID (AP) — The cause of Spain and Portugal’s widespread blackouts remained a mystery on Tuesday, with some isolated disruption remaining after power was largely restored to both countries.

On 28 April 2025, an unprecedented collapse of the Iberian Peninsula's electricity grid brought Spain and Portugal to a standstill. The likelihood of this ever happening was extremely low and—speculation about its causes aside—the episode has caused serious social disruption,