Spain and Portugal have been hit by widespread blackouts, with millions plunged into darkness amid scenes of mayhem across major European cities.

Spanish officials have said they are investigating the possibility of the blackouts being triggered by a devastating cyber attack.

Spain experienced power cuts following a significant milestone where the country’s power grid successfully operated solely on renewable energy sources like wind, solar, and hydropower on April 16.

During the power cuts, entire regions such as Valencia and Barcelona were left without electricity. Moreover, Spain’s entire rail network ceased operations, internet services went down, and streets faced traffic congestion in major cities like Madrid and Lisbon.

Online videos depicted the disarray in Spanish cities as the railway networks descended into confusion. The footage showed individuals being evacuated from tunnels, underground stations in darkness, and trains coming to a standstill due to the widespread blackouts.

Parts of France also lost power after the outages in Spain and Portugal, the country’s grid operator confirmed. Further outages have been reported as far as Belgium, according to the latest information.

The cause of the outages is not yet clear, with the Spanish government saying it is working to ‘identify the origin’.

A fire on the Alaric mountain in the south-west of France which damaged a high-voltage power line has also been identified as a possible cause, Portugal’s national electric company REN said.

E-Redes, a Portuguese electricity grid monitoring company, said it was investigating the cause of the outage, which it described as ‘a wider European problem’.

Airports were also affected, with emergency generators turned on at Porto and Faro airport, but operations ‘limited’ at Lisbon, according to officials.

Parts of Madrid’s sprawling metro system have been evacuated and traffic lights in the capital have stopped working, posing risk on major carriageways.

The outage is also said to have forced the closure of Barcelona’s tram system and stopped some traffic lights in the city from working. 

Internet and telephone lines across the country are also down. 

Meanwhile play has been suspended at the Madrid Open tennis tournament.

‘A crisis committee has been set up to manage the situation [in Spain]. At this stage there’s no evidence yet regarding the cause of the massive blackout,’ an official briefed on the situation in Spain told Politico.

‘A cyberattack has not been ruled out and investigations are ongoing,’ they added.

Spain’s INCIBE cybersecurity agency is investigating the possibility of the blackout being triggered by a cyber attack.

The country’s government said it is working to ‘identify the origin’ of the blackouts, with officials saying they are still gathering evidence.

Backup generators have meant Spain’s hospitals have been spared the worst of the power outages, with videos 

Some have suspended non-emergency surgeries, however emergency power supplies have kept essential equipment such as ventilators and cardiac monitors running.

A British expat living in Barcelona told MailOnline that ‘nobody seems to know what’s going on’ in Spain ‘because nobody has signal’.

The English teacher said he only found out about the European blackout from British reports.

‘I can get signal on my rooftop, but I can’t get signal down below. One floor down I have nothing,’ they said.

‘The traffic lights are still working… The underground is not working apparently. Lots of parts of the public transport are not working.’

Spanish railway company Renfe said that all trains have halted and no departures are currently taking place, with a power outage at a ‘national level’. 

Spain’s electricity grid operator Red Eléctrica wrote on X: ‘Plans to restore the electricity supply have been activated in collaboration with companies in the sector following the zero that occurred in the peninsular system.

‘The causes are being analyzed and all resources are being dedicated to solving it. We will continue to report.’

Lottie Feist, 23, who lives in Lisbon, told of panic across the Portuguese capital as traffic lights cut out.

The translation student at Nova University said: ‘There is no electricity, nothing is working.

‘We don’t know what’s happening or why we are having a blackout.

‘The roads are absolute carnage as no traffic lights are working.

‘All the power is down, and businesses are being impacted.

‘It’s terrifying, people will be stuck in elevators, and everything has completely shut down.’

In the Spanish city of Valencia, Metrovalencia which runs the city’s urban rail system said traffic was ‘disrupted’ due to a ‘general power outage in the city’.

In a post on X, Metrovalencia added: ‘The extent and duration of the outage are unknown.’

The Spanish government has gathered for an emergency session and is monitoring the situation as it develops, according to Spanish media. 

It is rare to have such a widespread outage there. Spanish generator Red Eléctrica said it affected the Iberian peninsula and the incident is being assessed.

The countries have a combined population of over 50 million people. It was not immediately clear how many were affected.

Spain’s public broadcaster RTVE said a major power outage hit several regions of the country just after midday local time, leaving its newsroom, Spain’s parliament in Madrid and subway stations across the country in the dark.

A graph on Spain’s electricity network website showing demand across the country indicated a steep drop around 12:15 p.m. from 27,500MW to near 15,000MW.

A couple of hours later, Spain’s electricity network operator said it was recovering power in the north and south of the peninsula, which would help to progressively restore the electricity supply nationwide.

In Portugal, a country of some 10.6 million people, the outage hit the capital, Lisbon, and surrounding areas, as well as northern and southern parts of the country.

Portugal’s government said the incident appeared to stem from problems outside the country, an official told national news agency Lusa.

‘It looks like it was a problem with the distribution network, apparently in Spain. It’s still being ascertained,’ Cabinet Minister Leitão Amaro was quoted as saying.

Portuguese distributor E-Redes said the outage was due to ‘a problem with the European electricity system,’ according to Portuguese newspaper Expresso. 

The company said it was compelled to cut power in specific areas to stabilize the network, according to Expresso.

Several Lisbon subway cars were evacuated, reports said. Also in Portugal, courts stopped work and ATMs and electronic payment systems were affected. Traffic lights in Lisbon stopped working.

It was not possible to make calls on mobile phone networks, though some apps were working.