A massive power cut has hit large parts of Spain and Portugal
The mayor of Madrid warns people to stay off the roads and only call the emergency services if it's "truly urgent"
Shops and restaurants in the Spanish capital were plunged into darkness, writes our correspondent Guy Hedgecoe
In Portugal, police say traffic lights are also down, the metro in Lisbon and Porto is closed, and there were long queues at cash points
The head of Spain's electricity network said earlier that restoring power could take between six and 10 hours
Andorra and parts of France were also hit - although the Balearic and Canary Islands seem not to have been affected
Are you affected? Email: bbcyourvoice@bbc.co.uk, external or WhatsApp +44 7756 165803
Some final remarks from Portugal's power firm REN, which goes on on to say that, "due to the complexity of the phenomenon and the need to rebalance electricity flows internationally, it is estimated that full normalisation of the network could take up to a week".
Earlier, the head of Spain's electricity network said that restoring power could take between six and 10 hours.
We have a bit more for you now from the Portuguese energy company REN (Rede Eletrica Nacional).
It says that "due to extreme temperature variations in the interior or Spain, there were anomalous oscillations in the very high voltage lines (400 KV), a phenomenon known as 'induced atmospheric vibration'".
As we said in our last post, Spain is yet to respond to these claims.
We're now hearing from Portugal's grid operator, REN, which says interruptions to the country's power supply were the result of a "fault in the Spanish electricity grid.
They say this was related to a "rare atmospheric phenomenon", but don't clarify what that means.
Spain is yet to respond to the claim.
We'll bring you more on this in our next few posts.
Holly Wallis
Live reporter
Will David, 40, a Briton living in Lisbon, says he was having a haircut and beard trim in the basement of a barbers in Lisbon when the power went down.
"Customers needing electric razors had to leave in various states of haircut and shave completion," says Will.
Rita, the barber, kindly found him a spot by the window upstairs to finish the cut with scissors and left Will looking "halfway presentable".
"The walk home felt very strange, both with the lack of traffic lights meaning a complete free-for-all for vehicles and pedestrians on the roads - as well as so many people milling around outside their places of work with nothing to do."
Image source, Getty ImagesPeople queuing for a bus in Lisbon earlier - trains and trams went down in the power cuts
Josh Parry
LGBT and identity reporter
Curtis Gladden, 29, is originally from Liverpool but recently moved to in La Vall D’Uixo, about 30 miles from Valencia.
He tells BBC News his phone signal hadn’t worked for around two hours, which he says was "scary" as he struggled to get updates about what was happening.
Now the signal has returned, he and other locals are using the time without electricity to get outside and enjoy a drink in the town’s pavement cafes.
It’s a local holiday in some parts of Spain, known as Saint Vincent Ferrer’s day.
Curtis and his partner Miguel were hoping to join in the festivities but say they are "uncertain" whether they’ll take place.
He says: "Nothing is working; we came to get some food and a drink but they can’t cook without electricity. There’s supposed to be a festival today but we’re not sure if it will happen now."
Residents in La Vall D’Uixo are taking the chance to have a drink outside during the power outage
Molly Stazicker
Transport reporter
Image source, ReutersIn our last post, we brought you an update from some of the affected airports across Spain and Portugal.
Now Gatwick, in London, has also reported issues - telling the BBC it's experiencing short delays on flights to Spain and Portugal.
The airport says there have so far been no cancellations and it's waiting for the issues to be resolved.
Meanwhile, airline Ryanair says it's monitoring potential disruptions to flights operating to and from all airports in mainland Spain and Portugal.
Let's have a quick look now at the situation at airports.
Madrid's international airport - Adolfo Suárez Madrid-Barajas - and Barcelona's Josep Tarradellas Barcelona-El Pratairport currently have notices saying "some incidents are occurring" as a result of the outage. The airports add that contingency generators are active, but warn anyone travelling to check with airlines as disruptions may affect access and ground transportation.
Lisbon and Porto airports similarly warn that "operation constraints" may occur.
Portuguese news agency Lusa is reporting that airport operator Ana has activated emergency generators - enabling essential operations to continue in Porto and Faro, but Lisbon is seeing further limitations.
Looking at departure boards, airports including Madrid, Barcelona and Porto are seeing delays.
Bernadette McCague
BBC News
Emily Thorowgood, who's from Bristol but who works as a teacher in an international school in Lisbon, has told the BBC she is currently "teaching in the dark" after the power went off at around noon local time.
"Lots of parents are taking their children out due to the power cuts," she says.
"It was flashing on and off for a long while but seems to have finally given up."
Image source, Getty ImagesA queue at a cash machine in Lisbon earlier - card payments are down across the city
Bernadette McCague
BBC News
Image source, EPAA closed pump in Castellon, north-east Spain
Lesley has lived in Spain for 11 years with her husband. The couple are currently based in Murcia, Spain.
"There's very little news about what's happened," she tells the BBC.
"We are worried about food, water, cash and petrol in case this goes on for a couple of days."
She says there's "more to worry about" than the Madrid Open tennis tournament being suspended.
"My husband is driving around now trying to find a petrol station that's open to get petrol for the generator so that we can plug in the fridge."
Image source, EPAPedro Sanchez is currently hosting an "extraordinary" meeting of Spain's national security council, the prime minister's press office says in a statement on social media, external.
We're yet to hear an update from the meeting, but when we do we'll let you know.
James Kelly
BBC News
In the Spanish resort of Benidorm, Mark England tells us how the lack of power has disrupted his holiday.
He says he and his partner Jonnie had gone for lunch when the lights in the dining room started to go off.
"Then everything went off and the fire alarm started going off and the fire doors started closing," he tells the BBC.
"There’s still no power. We’re walking down the main street now and the majority of shops are in darkness and shuttered up or have people on the entrances saying you can’t come in.
"There’s no cash machines, no traffic lights so it’s strange. It’s kind of bizarre."
Worst of all, at a holiday destination like Benidorm, Mark says bars are unable to serve drinks because of a lack of power to their pumps.
"If you haven’t got a drink, you are out of luck," he says.
Mark England (left) has had his holiday in Benidorm disrupted by the power cut
The head of Spain’s electricity grid says restoring power could take hours.
Speaking at a news conference, Red Electrica CEO Eduardo Prieto tells reporters that the operation to solve the issue could take "between six and ten hours".
We'll bring you more on this as soon as we get it.
It's been more than two hours since a massive power cut left swathes of Spain and Portugal without power.
What we know so far
What we don't yet know
Image source, ReutersEarlier, the outage stopped play at the Madrid Open, with Britain's Jacob Fearnley among those forced off court
Image source, Getty ImagesWe've now heard from the mayor of Madrid, who's asking residents to stay put where possible.
"I ask all residents of Madrid to keep their movements to an absolute minimum and, if at all possible, to remain where they are. We want to keep all roads clear," José Luis Martínez-Almeida says in a video posted on social media.
Speaking from the integrated emergency security centre of Madrid he says that on top of traffic lights being off, tunnels of certain highways have had to be closed.
The mayor also asks residents to only call emergency services if it is "truly urgent": "If emergency calls go unanswered, go to the police and the fire stations in person, where they will try to deal with all the emergencies which may present themselves."
Joaquin Sorolla train station in Valencia, Spain, is full of passengers who are stranded after their trains were affected by the power outage.
Earlier, Spain's national railway company Renfe said the "entire National Electricity Grid" had been "cut off".
Image source, Reuters
Image source, Reuters
Image source, ReutersHannah Lowney, who is from Manchester but lives in Madrid, says she was halfway through scanning her grocery shopping in Aldi when the power went out.
In a voice message to the BBC's Naga Munchetty, on Radio 5 Live, she explains:
"Looking out the window it seemed like it was the whole street [that lost power], and then the people in Aldi said it was a nationwide power cut.
"The traffic lights are out. People are coming out of their offices and walking home because they can’t tell when the buses are coming.
"It seems no one has an idea of when it will come back.
"It’s a bit disconcerting that it’s the whole country, I’ve never experienced this before."
Image source, ReutersMetro workers in Spain have barricaded stations and are telling members of the public to find alternative routes
Image source, ReutersPeople pictured on their phones at the Madrid Open tennis tournament, which was suspended due to the outage
Mobile phone networks have also been hit by the massive power cut.
Reporters for the AFP news agency in Madrid and Barcelona saw people heading into the streets, holding their smartphones up to try to connect to a network.
Many people used the radio, rather than their phones, to get updates, the news agency says.
Portuguese airline TAP Air has warned passengers not to head to airports until further notice.
In a statement on its Facebook page, the airline says some services are not operating as usual and asks passengers to await more information.
Parts of France temporarily lost power following the outages in Spain and Portugal, Reuters news agency reports, citing French grid operator RTE.
A spokeswoman for RTE gives no further detail on the extent of the outage, but says that power has now resumed after the brief interruption.
We're seeing some reports about Portuguese electricity distribution network, E-Redes, working on re-establishing power in phases.
However, their website has just gone down "for maintenance". We'll have more updates from Portugal as soon as we get them.
Image source, ReutersA closed metro station in Lisbon