Nick Beake
Europe Correspondent, reporting from Madrid

Here at Atocha train station in Madrid, many people endured a miserable night sleeping on the floor.

Many were angry and said they were hungry and thirsty.

There are now big queues on the concourse as passengers try to work out if their service is running.

Many trains are being moved to other platforms at short notice so it is a rather confusing scene.

Construction work has resumed here, causing a massive din that echoes through the station, adding to the chaotic atmosphere.

Portuguese energy operator Ren says it has restored power to all substations on the national transport network.

Ren says it worked with both international and national network operators, and adds that "the network is now perfectly stabilised".

Guy Hedgecoe
Reporting from Madrid

Image source, EPA-EFE/REX/Shutterstock

Spanish Prime Minister Pedro Sánchez has warned that people should be careful about misinformation regarding this whole crisis.

Inevitably, people are looking very closely at what might be the cause of all this.

Yesterday, the regional president of Andalucía, Juanma Moreno, suggested that a cyberattack was the likely cause. But that was then quickly dismissed by other officials close to the government.

There is going to be a lot of debate as to whether this has anything to do with a cyberattack or perhaps a weather phenomenon.

The government is saying wait, hold tight and wait for information, and in the coming days hopefully we will know what the cause of all this was.

Guy Hedgecoe
Reporting from Madrid

Image source, Reuters

We do have power back. Things are returning to normal, although the government has said that it is going to be a process which could take a little bit longer.

For example, school classes will not take place in many areas of the country today.

The transport sector, which was heavily affected yesterday, is still going to be impacted.

There were a number of trains last night which were still stranded between stations in some rural areas - so there are still some challenges there.

But the feeling is things are slowly returning to normal.

Image source, Getty Images

Spain’s transport minister has given an update after widespread disruption led to trains being cancelled and even evacuated in some regions.

A number of train lines are cancelled until further notice, mainly affecting commuter trains in places like Bilbao, Cadiz, Seville, Zaragoza, Vigo and San Sebastian.

Commuter services in Madrid and Valencia are returning to normal but with “reduced services”.

For long-distance trains, services from Madrid to Barcelona, Valencia, Malaga, Santander, Granada and the Basque Country are “progressively returning to normal”.

However, trains from Madrid to Huelva, Cadiz, Salamanca, Badajoz and Galicia remain cancelled until further notice.

If you missed it, the Madrid Metro has now fully reopened except for Line 7A, which connects the north of the city to the east via Atletico Madrid’s stadium.

As for flights, there are under 500 cancellations across Spain and Portugal.

In its latest update, Spanish power operator Red Electrica says "99.95% of demand restored".

Work is still ongoing to get it back to 100%.

Image source, Getty Images

Flight cancellations are currently below 500 across Spain and Portugal, according to transport journalist Simon Calder.

He says the situation isn’t on the same scale as the recent Heathrow Airport power cut, which saw 1,400 flights cancelled.

Calder also tells BBC Radio 5 Live’s Breakfast that many people who were due to fly from Spain and Portugal to the UK couldn’t get to the airport because of severe transport chaos on the ground.

He adds that while some airlines are allowing travellers to postpone their journeys, “other airlines not being necessarily so generous”.

“If you’re travelling today – you can hopefully expect things to go ahead ok. There are a few residual problems [airline delays] but you should get to where you’re going.”

Image source, Getty Images

Madrid Metro services across the whole network, except for Line 7A, have started at 08:00 local time (07:00 BST), according to the president of the Community of Madrid.

Isabel Díaz Ayuso also says that 80% of trains will "run during a normal morning rush hour".

All public city buses and intercity train lines are running as normal and will be free all day, she adds.

"The region's six transport interchanges remain open as usual."

Red Electrica, Spain's power operator, says that as of 06:00 local time (05:00 BST), 99.16% of power has been restored to mainland Spain.

"All substations on the transmission grid are operational. We continue with the restoration work," the operator says.

Thomas Mackintosh
Live reporter

Image source, Getty Images

Good morning from London.

We're taking over from our colleagues in Singapore, focusing on the fallout from yesterday's massive power cut across Spain and Portugal.

If you're just joining us, here are the main updates:

• Power has now been restored to around 90% of mainland Spain
• In Portugal, about 6.2 million out of 6.5 million households now have electricity again
• Spain's King Felipe is set to chair a national security meeting later to find out what caused the power cut, local media reports
• A state of emergency is still in place across Spain, and regions including Madrid, Andalusia and Extremadura have asked the central government to take charge of public order

We'll keep you updated throughout the day, so stay with us.

Image source, Reuters

Power has been restored overnight in parts of Lisbon, according to the government.

About 6.2 million out of 6.5 million households in Portugal now have electricity again, the national grid operator tells AFP news agency.

Energy operator Ren says it has managed to get power to "85 of the 89 substations and switching stations" and hopes to fix the remaining issues today.

While the majority of power has been recovered overnight, a state of emergency remains in place in Spain this morning as the recovery from the blackout continues.

The emergency status will be applied to regions that request it, officials say.

So far, Madrid, Andalusia and Extremadura have asked for the central government to take over public order and other functions.

Spain's 17 regions have their own directly-elected authorities, which handle a number of issues local to their area.

But when big events happen which impact large swathes of the country, regions are able to get further help from the national government by requesting the intruduction of a state of emergency.

There were cheers as the power came back on in Madrid, hours after the Spanish capital was plunged into darkness.

While there is still widespread disruption, there has been major progress overnight in restoring power in Spain.

Red Eléctrica, the partly state-owned body which operates Spain's national grid, reported at 04:00 in Spain (03:00 BST) that 87% of power had been restored.

Yang Tian
Live reporter

Image source, Getty Images

Welcome back to our live coverage of the sweeping power outage that has left millions of people in Spain, Portugal and parts of France without electricity on Monday.

It's still unclear why the outage occurred and how it spread so quickly, but Portuguese Prime Minister Luis Montenegro insisted there was "no indication" of a cyber-attack.

A European trade body told the BBC's The World Tonight there was a "technical issue" with an energy connection between France and Spain.

Stay with us as we bring you the latest updates.

Image source, Reuters

It's been several hours since the first reports emerged of power cuts in Spain and Portugal, causing widespread disruption and travel chaos.

As we approach midnight in Barcelona and 23:00 in Lisbon, here are the latest updates:

• Half of Spain's power has been restored, according to Prime Minister Pedro Sanchez, after a state of emergency was declared in the country
• Authorities are still yet to establish why the outage occurred, Sanchez said, after Portuguese Prime Minister Luis Montenegro insisted there was "no indication" of a cyber attack

• Sanchez told the country "a long night lies ahead" as images across Spain and Portugal show residents plunged into darkness

• A European trade body told the BBC's The World Tonight there was a "technical issue" with an energy connection between France and Spain earlier

• Portugal's power firm REN said earlier today it could take a week to normalise the country's power network in full

We'll be pausing our live coverage but you can stay across this story on the BBC's website:

• Spain and Portugal scramble to restore power as officials chase cause of outage
• 'Everything went off': How Spain and Portugal's massive power cut unfolded
• Watch: Traffic chaos as Spain and Portugal face power outages

Gabriela Pomeroy
Live reporter

Image source, Isaac Bifet

Classical violinist Isaac Bifet went to a rehearsal this morning at the symphony orchestra in Madrid. But the building was all dark and most of the other orchestra players hadn't turned up because they were stranded with no transport.

People without cash were particularly stuck, he says, because online payments systems went down.

"I had no cash," Isaac says, "so I went to a café and the owner said: 'Don't worry you can pay me another time.'"

Isaac has had no mobile phone connection for most of the day. When he spoke to me, his connection had just come back but he is still not able to charge his phone. He went out and bought a transistor radio, because old-style radios were still working, he says.

"It was a very strange day," Isaac says. "The atmosphere in the city was actually pretty nice" he says, "though a little medieval".

Now he is at home, drinking beers with friends by candlelight.

Sergi Forcada Freixas
BBC News

Spain's Interior Ministry has been reinforcing police patrols across the country by deploying 30,000 officers to maintain public order and prevent security incidents, particularly on roads where traffic signals are not working.

“Citizens can and should remain calm,” Prime Minister Pedro Sánchez said during his latest address.

In many towns and cities, plain clothed officers are being used to prevent looting and protect businesses, many of which are unable to lower their electric shutters due to the power outage.

In Catalonia, the Mossos d'Esquadra (Catalan Police) will deploy more than 7,000 officers overnight to respond to emergencies and maintain public order.

We're getting some new details now from Spanish Prime Minister Pedro Sanchez

He says around half the country has now had their power restored - with the rest due to be restored by tomorrow.

As for any cause, Sanchez explains the authorities have not yet established why the outage occurred.

"Citizens can and should be calm," he says. "We have a clear goal and is to get power fully restored by tomorrow."

He adds that schools will remain open tomorrow but that in some cases there won't be classes or exams.

"A long night lies ahead; we will continue working to restore normality as soon as possible," he concludes.

The trade body that represents the power industry in Europe tells BBC's The World Tonight a problem occurred with the energy connection between France and Spain earlier today.

Kristian Ruby, the general secretary of EURELECTRIC, also describes the outage as a "50 year, if not 100 year incident....something very very rare "

Ruby tells BBC's World Tonight they are aware of a "specific incident with an interconnector between France and Spain".

The general secretary says: "There was a specific technical issue that arose there and hence the Spanish grid was disconnected from the broader European grid earlier today.

"Now, judging from that situation alone, you wouldn't think that would cause a power cut across the entire Iberian peninsula, so my assessment is there is likely to have been other elements in this equation that have caused this situation," he adds.