Spain and Portugal’s power is almost fully restored, but the huge blackout’s cause remains a mystery

Power had almost fully returned to Spain and Portugal on Tuesday although many questions remained about what caused one of Europe’s most severe blackouts
Passengers sit as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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Passengers sit as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

MADRID (AP) — Power was almost fully restored to Spain and Portugal on Tuesday although many questions remained about what caused one of Europe’s most severe blackouts that grounded flights, paralyzed metro systems, disrupted mobile communications and shut down ATMs across the Iberian Peninsula.

By 7 a.m., more than 99% of energy demand in Spain had been restored, the country’s electricity operator Red Eléctrica said. Portuguese grid operator REN said Tuesday morning all of the 89 power substations were back online since late last night and power had been restored to all 6.4 million customers.

By Tuesday morning, life was returning to normal: schools and offices reopened in Spain, traffic eased along the capital’s main arteries and public transport restarted after significant delays.

Spanish authorities did not provide new explanations for what caused the blackout, one of the most serious to ever take place in Europe.

In a televised address Monday night, Spanish Prime Minister Pedro Sánchez said the power grid for the Southern European nation of 49 million people lost 15 gigawatts — equivalent to 60% of its national demand — in just five seconds.

“We have never had a complete collapse of the system,” Sánchez said. Authorities were still investigating what happened on Tuesday.

Cause remains a mystery

Such widespread electric failure has little precedent on the Iberian Peninsula or in Europe.

On Tuesday, Spain’s meteorological agency AEMET said that it had not detected any “unusual meteorological or atmospheric phenomena” on Monday, and no sudden temperature fluctuations were recorded at their weather stations.

Portugal’s National Cybersecurity Center on Monday threw cold water on feverish speculation about foul play, saying there was no sign that the outage resulted from a cyber attack. European Council President Antonio Costa also said there were “no indications of any cyber attack” Monday afternoon.

Teresa Ribera, an executive vice president of the European Commission, also ruled out sabotage. Nonetheless, the outage “is one of the most serious episodes recorded in Europe in recent times,” she said.

Chaos at train stations, Madrid Open opening delayed

At Spain’s largest train stations, droves of travelers waited Tuesday morning to board trains, or to rebook tickets for journeys that were canceled or disrupted on Monday and return home.

At Atocha station in Madrid, hundreds of people stood near screens waiting for updates. Many had spent the night at the station, wrapped in blankets provided by the Red Cross around 1 a.m. Tuesday morning for those who had to wait overnight thanks to canceled trains. Similar scenes played out at Barcelona’s Sants station.

The Madrid Open tennis tournament being held this week was still affected by the power outage Tuesday after its cancellation the previous day. Tournament organizers delayed opening its doors.

Metro systems restored but other trains still disrupted

By 11 a.m. Tuesday, service on Madrid’s metro system was fully restored. In Barcelona, the system was operating normally but commuter trains were suspended due to “electrical instability,” the company that runs the service, Rodalies Catalunya, said on X.

In some parts of the country, commuter and mid-distance services were still suspended or running at reduced capacity.

Emergency workers in Spain said they had rescued some 35,000 passengers on Monday stranded along railways and underground, with the blackout turning sports centers, train stations and airports into makeshift overnight refuges.

On Monday, Rubén Carión was stranded on a commuter train outside Madrid, when he pried the window open and walked to the nearest transit station by foot. Then, he spent the night in the city’s Atocha station after his train back to Barcelona was canceled.

The 24-year-old said he chose to wait overnight at the station instead of a hotel so he could stay updated on when he could board a train home, describing his experience as “pure chaos.”

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Associated Press video journalist Helena Alves in Lisbon, Portugal, contributed to this report.

People wait outside a closed train station, during a major power outage in Barcelona, Spain, Monday, April 28, 2025. (AP Photo/Emilio Morenatti)

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Paquita Gonzalez cries as she waits for news of train departures, after spending the whole night at the station Sants station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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A man sells battery-powered radios and torches on a Barcelona street during the blackout in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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Passengers sleep and sit on the ground as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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Passengers crowd the train accesses at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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Electric trams drive through Lisbon, Tuesday, April 29, 2025, the day after a nationwide power outage that stopped trams, trains and subways. (AP Photo/Armando Franca)

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Passengers react as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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Passengers wait outside Atocha train station during a nationwide power outage in Madrid, Monday, April 28, 2025. (AP Photo/Manu Fernandez)

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Passengers crowd the train accesses as other sleep at the ground at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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Passengers sit as they wait for news of train departures, at Sants train station in Barcelona, Spain, Tuesday, April 29, 2025. (AP Photo/Emilio Morenatti)

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People queue for petrol in Lisbon, Tuesday, April 29, 2025, the day after a nationwide power outage that shut down gas stations, trains and subways. (AP Photo/Armando Franca)

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Passengers roam outside Atocha train station during a nationwide power outage in Madrid, Monday, April 28, 2025. (AP Photo/Manu Fernandez)

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Vendors react outside their shop, during a major power outage in Barcelona, Spain, Monday, April 28, 2025. (AP Photo/Emilio Morenatti)

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Passengers wait outside Atocha train station during a nationwide power outage in Madrid, Monday, April 28, 2025. (AP Photo/Manu Fernandez)

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A medical staffer relocates a patient during a nationwide power outage in Pamplona, northern Spain, Monday, April 28, 2025. (AP Photo/Miguel Oses)

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People try to board a crowded bus after the subway stopped running following a power outage in Lisbon, Portugal, Monday, April 28, 2025. (AP Photo/Armando Franca)

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Passengers wait outside Lisbon Airport during a nationwide power outage in Lisbon, Monday, April 28, 2025. (AP Photo/Armando Franca)

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A vendor sit at her shop, during a major power outage in Barcelona, Spain, Monday, April 28, 2025. (AP Photo/Emilio Morenatti)

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Garbage bags hang from the doors of electric recycling bins during a massive power outage in Pamplona, northern Spain, Monday, April 28, 2025. (AP Photo/Miguel Oses)

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A freight train loaded with cars is stopped on the track during a nationwide power outage near Sagunto, eastern Spain, Monday, April 28, 2025. (AP Photo/Alberto Saiz)

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A car drives down an unlit street in Lisbon, during a nationwide power outage, Monday night, April 28, 2025. (AP Photo/Armando Franca)

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People board on a bus, during a major power outage in Barcelona, Spain, Monday, April 28, 2025. (AP Photo/Emilio Morenatti)

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A city bus goes by the historic city of Santiago, Spain during a major power outage across Spain and Portugal Monday, April, 28, 2025. (AP Photo/Mic Smith)

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