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Parts of Spain, Portugal and southern France were plunged into darkness on Monday by a massive power outage. The lights are coming back on for some, but the cause of the outage remains unclear.

The sweeping blackout across the Iberian Peninsula began midday local time. As of Monday evening, power has been partially restored across the three countries, but large swaths of the region remain without electricity. 

The power outage halted nearly every aspect of daily life for tens of millions of people — disrupting subways, cutting phone service and shutting down traffic lights and ATM machines. Meanwhile, back-up systems maintained power for hospitals, nuclear plants and prisons. 

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.

He added that, within a matter of seconds, a large amount of power — equivalent to 60% of Spain's electricity demand — was lost. Sánchez said the underlying cause of the outage remains unclear, and no theory has been ruled out.

Earlier on Monday, António Costa, the president of the European Council and former prime minister of Portugal, said on X that there were 

no signs so far suggesting that a cyber attack

Significant progress made in restoring electricity

On Monday evening, Sánchez said almost half of the power supply in Spain had been recovered. He added that nearly every region in Spain was showing improvement. He also thanked France and Morocco for their assistance in bringing back electricity.

Among the areas where power has been restored are major cities, including the country's capital Madrid and Murcia, as well as regions like Catalonia, home to Barcelona, according to Spanish power distributor Red Eléctrica. 

Despite the progress, the prime minister said it remains unclear how long it will take to fully restore power across Spain.

Meanwhile, Portuguese grid operator REN said that 

 in Portugal as of Monday night. Electricity had not yet been restored in Lisbon, the nation's capital, but REN said 

Blackout led to major disruptions in travel

The massive blackout brought Spain and Portugal to an abrupt standstill on Monday.  

Public transportation, including subways and rail services, was suspended across Spain. Authorities worked to 

 that were stranded on Monday, the country's transport minister Oscar Puente wrote on X.

The blackout also led to dozens of flight delays and cancellations at airports in Lisbon, Madrid and Barcelona, according to the flight tracking website 

. But Aena, which manages many Spanish airports, said on X that 

most airports were able to remain operational

 on Monday thanks to backup electrical systems.  

NPR's Eleanor Beardsley in Paris and Miguel Macias in Seville, Spain contributed reporting.

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Spanish prime minister Pedro Sánchez said a nationwide blackout of this scale had never happened before in Spain. He added that the underlying cause remains unclear. 

Spain and Portugal begin recovering from a massive blackout. Here's what to know

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