Spain-Portugal blackouts latest: Head of Spain’s power grid refuses to resign as officials hunt for cause - Power has been restored to tens of millions but the cause of the power cut remains unknown ...

The cause of the blackout remains a mystery At a press conference on Monday evening, Spanish Prime Minister Pedro Sánchez said a nationwide blackout of this scale had never happened before in Spain.

Spain lost 15 gigawatts of electricity — or about 60% of its supply. Portugal, whose grid is connected to Spain’s, also went down. Only the countries’ island territories were spared.

Spain lost 15 gigawatts of electricity — or about 60% of its supply. Portugal, whose grid is connected to Spain's, also went down. Only the countries' island territories were spared.

Spain and Portugal begin recovering from a massive blackout. Here's what to know Spanish prime minister Pedro Sánchez said a nationwide blackout of this scale had never happened before in Spain.

The cause of the blackout remains a mystery At a press conference on Monday evening, Spanish Prime Minister Pedro Sánchez said a nationwide blackout of this scale had never happened before in Spain.