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Heathrow airport closed: counter-terrorism police deployed in ‘routine’ investigation into substation fire – live

Posted byFinance World 24

Counter-terrorism involvement ‘routine’ and ‘nothing more than precaution’

Vikram Dodd

Vikram Dodd

Investigators continue to believe the fire was not the result of a deliberate act, but stress inquiries are at an early stage.

Detectives from Scotland Yard’s counter-terrorism command are being deployed as part of the investigation, but that is described as routine and nothing more than a precaution.

Counter-terrorism detectives bring some specialist skills but also they have the security clearance to access sensitive material as investigators try to establish the fire’s cause.

Authorities, including from the intelligence service, are monitoring and would be updated if the police led investigation suggests anything suspicious led to the fire.

Heathrow is part of the UK’s critical national infrastructure and thus a potential target for terrorism or sabotage in pursuance of a cause. Espionage and sabotage in the UK backed by state actors has risen in recent years.

A police officer and firefighters at the North Hyde electrical substation which caught fire.
A police officer and firefighters at the North Hyde electrical substation which caught fire. Photograph: Andrew Matthews/PA

The energy regulator, Ofgem, has promised to commission a review of the substation blaze which left up to 100,000 people without power and ground Heathrow airport to a halt.

Akshay Kaul, the director general for infrastructure at Ofgem, said: “We are clear the top priority is reconnecting both domestic and business customers, including Heathrow airport, as soon as possible and that vulnerable customers are supported in the meantime.”

n “Once power is restored, we will commission a review to understand the cause of this incident and what lessons can be learned.”

n Tens of thousands of customers have already had their power restored with restoration of supplies to the remaining 500 customers and Heathrow airport underway.

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Energy industry experts have questioned why Heathrow was so vulnerable to a major fault at one of National Grid’s substation within the local network with no immediate alternative electricity routes available through the local networks.

n Kaul said: “We expect network operators to keep their customers fully updated on the support available, including welfare provision, and when power will be restored.”

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The Metropolitan police has now confirmed that the counter-terrorism command is leading inquiries as to the source of fire at the substation in Hayes, while stressing there is “currently no indication of foul play.”

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n

A spokesperson for the Met said:

“We are working with the London fire brigade to establish the cause of the fire which remains under investigation. While there is currently no indication of foul play we retain an open mind at this time.

n Given the location of the sub-station and the impact this incident has had on critical national infrastructure, the Met’s counter-terrorism command is now leading inquiries.

n This is due to the specialist resources and capabilities within that command that can assist in progressing this investigation at pace to minimise disruption and identify the cause.”

n

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International Air Transport Association, the trade association for airlines, said it would be a “clear planning failure” if Heathrow turned out to be “dependent on a single power source without an alternative.”

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“From that arises the question of who bears the costs of taking care of disrupted travellers. We must find a fairer allocation of passenger care costs than airlines alone picking up the tab when infrastructure fails. Until that happens, Heathrow has very little incentive to improve,” IATA’s director general Willie Walsh said in a statement.

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Walsh added that “today’s closing of Heathrow will inconvenience a huge number of travellers,” as he called it a “yet another case of Heathrow letting down both travelers and airlines.”

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Investigators continue to believe the fire was not the result of a deliberate act, but stress inquiries are at an early stage.

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Detectives from Scotland Yard’s counter-terrorism command are being deployed as part of the investigation, but that is described as routine and nothing more than a precaution.

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Counter-terrorism detectives bring some specialist skills but also they have the security clearance to access sensitive material as investigators try to establish the fire’s cause.

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Authorities, including from the intelligence service, are monitoring and would be updated if the police led investigation suggests anything suspicious led to the fire.

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Heathrow is part of the UK’s critical national infrastructure and thus a potential target for terrorism or sabotage in pursuance of a cause. Espionage and sabotage in the UK backed by state actors has risen in recent years.

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police officer and firefighters at the North Hyde electrical substation which caught fire.”,”caption”:”A police officer and firefighters at the North Hyde electrical substation which caught fire.”,”credit”:”Photograph: Andrew Matthews/PA”}}],”attributes”:{“pinned”:true,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742556651000,”blockCreatedOnDisplay”:”07.30 EDT”,”blockLastUpdated”:1742559645000,”blockLastUpdatedDisplay”:”08.20 EDT”,”blockFirstPublished”:1742556853000,”blockFirstPublishedDisplay”:”07.34 EDT”,”blockFirstPublishedDisplayNoTimezone”:”07.34″,”title”:”Counter-terrorism involvement ‘routine’ and ‘nothing more than precaution'”,”contributors”:[{“name”:”Vikram Dodd”,”imageUrl”:”https://i.guim.co.uk/img/uploads/2017/12/26/Vikram-Dodd.jpg?width=300&quality=85&auto=format&fit=max&s=5cac2d25e43c39a15f90e14fc954abe4″,”largeImageUrl”:”https://i.guim.co.uk/img/uploads/2017/12/26/Vikram_Dodd,_L.png?width=300&quality=85&auto=format&fit=max&s=11c544e126c4149da7d3f86f61f45d67″}],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 EDT”},{“id”:”67dd4bd68f08e154ecc154de”,”elements”:[{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

UK prime minister Keir Starmer has posted an update on Heathrow outage, saying he is “receiving regular updates” on the incident.

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Here is what he said:

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n

“I know the situation in Heathrow is causing distress and disruption, especially for those travelling or without power in their homes. I’m receiving regular updates and I’m in close contact with partners on the ground. Thanks to our emergency workers for keeping people safe.”

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passenger stands outside Terminal 3 at Heathrow Airport.”,”caption”:”A passenger stands outside Terminal 3 at Heathrow Airport.”,”credit”:”Photograph: Tolga Akmen/EPA”}},{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

Travellers have woken up to the news that Heathrow airport is closed due to a nearby fire. Friday is usually the busiest day of the week for travel as people return from business trips or head off on holiday, with more than 1,350 flights due to take off and land.

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If you are among the up to 291,000 passengers whose flights have been disrupted by the power outage, you have significant rights in relation to replacement flights, refunds and general customer care.

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London fire brigade’s assistant commissioner Smith is also asked about air quality consequences of the fire.

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He insists that there were “no issues with the air quality as we stand,” and reassured reporters the LBF has “very good scientific advisers who advise us to make sure that we are doing what we need to ensure the quality of the air.”

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He declined to respond to questions about any potential previous fires at the substation, whether the airport had sufficient backup power, and potential costs associated with the disruption.

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London fire brigade is giving a press briefing just now, updating on its response to the incident.

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Deputy commissioner Jonathan Smith says the service received over 200 calls to a fire, which involved a transformed “comprising of 25,000 litres of cooling oil, fully alight.”

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He says this created “a major hazard due to the still live high voltage equipment and the nature of the oil fueled fire.”

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“At the most recent update that I have received, approximately 10% remains alight,” he says.

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He adds 67,000 households were left without power as a result of the fire, and 5,000 remain without power at the moment.

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He confirms that there remains no power at Terminal 2 and Terminal 4 of Heathrow.

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Smith says scientific advisers and the Metropolitan police are investigating the cause of the fire, and disruption is “expected to continue”.

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workers at the North Hyde electrical substation which caught fire.”,”caption”:”Electricity workers at the North Hyde electrical substation which caught fire.”,”credit”:”Photograph: Andrew Matthews/PA”}},{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

The substation fire which brought Heathrow to a standstill was highly rare and unusual, scientists have said.

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“Fires like this are not common at all, as equipment is monitored to check its health and the equipment gets replaced once it starts showing signs of age that mean it could be dangerous (for obvious safety reasons),” said Dr Robin Preece, reader in future power systems at the University of Manchester, “Until the reports are completed by the equipment owners, it’s not possible to know the cause of the failure and the fire.”

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Oil is used as an electrical insulator in these substations, he said, which means if there is a fire it becomes large and difficult to control: “The whole substation would probably need to be switched off and de-energised in order to let firefighters safely deal with the blaze. You cannot fight a fire in an electrical substation that is energised. Certainly all of the equipment adjacent to the transformer on fire would need to be de-energised.”

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He said that “pretty much everyone” will be “back on supply very quickly” as there are sufficient alternate supplies on the electricity grid.

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Dr Paul Cuffe, engineering professor at University College Dublin suggested Heathrow should have more resilient energy infrastructure to prevent these situations:

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“One could argue that a critical piece of national infrastructure like Heathrow deserves special grid connection arrangements to secure its supply of electricity further. For instance, sometimes critical loads like this are fed from two separate substations to provide redundancy when outages happen. I am not familiar with the exact connection arrangements for Heathrow airport but neither setup would surprise me.”

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“It is ultimately a political and economic question to determine the right level of capital investment into grid infrastructure to avoid the problems that outages like this cause. Redundant power supplies for an airport the size of Heathrow do not come free!”

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Flights will be diverted across the UK and Europe, but because Heathrow is so massive, these airports will likely run out of capacity, said Dr Guy Gratton, associate professor of aviation and the environment, at Cranfield University.

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He explained: “All airline flights must declare their destination and one or two ‘alternates’, which are airports they will go to in the event of problems at their destination. The UK has many large airports and flights have been diverting from Heathrow to airports at least as far away as Manchester. Alternates don’t have to be in the UK so for example Frankfurt or Schiphol may be used. With such a major airport closing however, there is significant risk of running out of capacity at those places.

n “The absolute priority will of course be safety, with convenience to the passengers inevitably secondary to that. This is inevitably going to lead to significant disruption and frustrations.”

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London mayor Sadiq Khan said that Heathrow has warned “of significant disruption over the coming days,” as he thanked emergency services for responding to the fire at a substation.

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Here is his statement in full:

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n

Heathrow Airport is closed today due to a power outage caused by a fire at a nearby electrical substation. The fire is having a significant impact on the local area with the airport closed, other businesses affected and homes left without power.

n

I know this will be hugely frustrating for the many thousands expecting to travel to and from Heathrow today, the families who have had their power cut and the commuters who have had their journeys disrupted.

n

I’d like to thank the emergency services who have been working hard overnight to tackle the fire, and I remain in close contact with them, as I have been overnight. Thankfully, there are no reports of any injuries.

n

Electricity suppliers are working hard to restore power, but Heathrow Airport have said they will be closed all day and has warned of significant disruption over the coming days.

n

Passengers are advised not to travel to the airport under any circumstances and I urge Londoners to follow the advice of emergency services and their travel providers.

n

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service information notice in the Underground Station at Terminal 5 at Heathrow Airport.”,”caption”:”A service information notice in the Underground Station at Terminal 5 at Heathrow Airport.”,”credit”:”Photograph: Tolga Akmen/EPA”}}],”attributes”:{“pinned”:false,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742550458000,”blockCreatedOnDisplay”:”05.47 EDT”,”blockLastUpdated”:1742552197000,”blockLastUpdatedDisplay”:”06.16 EDT”,”blockFirstPublished”:1742552199000,”blockFirstPublishedDisplay”:”06.16 EDT”,”blockFirstPublishedDisplayNoTimezone”:”06.16″,”title”:”Closed Heathrow airport – in pictures”,”contributors”:[],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 EDT”},{“id”:”67dd2f5f8f08cf08c55c76c1″,”elements”:[{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

If you’ve been impacted by the Heathrow airport closure as a traveller or live nearby and are experiencing a power cut, we’d like to hear from you.

“,”elementId”:”ff9ae7c1-2b23-4b2e-82d0-39c0e64feacc”},{“_type”:”model.dotcomrendering.pageElements.RichLinkBlockElement”,”prefix”:”Related: “,”text”:”Tell us: have you been affected by London’s Heathrow airport closure? “,”elementId”:”96f5df0d-1107-4e58-a3bc-f958b7af9c8e”,”role”:”thumbnail”,”url”:”https://www.theguardian.com/global/2025/mar/21/tell-us-have-you-been-affected-by-londons-heathrow-airport-closure-flight”}],”attributes”:{“pinned”:false,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742548831000,”blockCreatedOnDisplay”:”05.20 EDT”,”blockLastUpdated”:1742549275000,”blockLastUpdatedDisplay”:”05.27 EDT”,”blockFirstPublished”:1742549276000,”blockFirstPublishedDisplay”:”05.27 EDT”,”blockFirstPublishedDisplayNoTimezone”:”05.27″,”title”:”Tell us: have you been affected by London’s Heathrow airport closure?”,”contributors”:[],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 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North Hyde electrical substation which caught fire.”,”caption”:”The North Hyde electrical substation which caught fire.”,”credit”:”Photograph: Jonathan Brady/PA”}}],”attributes”:{“pinned”:false,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742545412000,”blockCreatedOnDisplay”:”04.23 EDT”,”blockLastUpdated”:1742545672000,”blockLastUpdatedDisplay”:”04.27 EDT”,”blockFirstPublished”:1742545672000,”blockFirstPublishedDisplay”:”04.27 EDT”,”blockFirstPublishedDisplayNoTimezone”:”04.27″,”title”:”Emergency services at North Hyde substation in Hayes – in pictures”,”contributors”:[],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 EDT”},{“id”:”67dd212b8f084e9a4f71610e”,”elements”:[{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

British Airways has posted this statement on its social media:

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n

Due to a power outage in the London Heathrow area, London Heathrow Airport is currently closed.

n

As a result, customers due to travel from Heathrow on Friday are advised not to travel to the airport until further notice.

n

This will clearly have a significant impact on our operation and our customers and we’re working as quickly as possible to update them on their travel options for the next 24 hours and beyond.

n

“,”elementId”:”9c034bb0-30c6-4c59-8398-56064f812fe1″}],”attributes”:{“pinned”:false,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742545195000,”blockCreatedOnDisplay”:”04.19 EDT”,”blockLastUpdated”:1742545272000,”blockLastUpdatedDisplay”:”04.21 EDT”,”blockFirstPublished”:1742545272000,”blockFirstPublishedDisplay”:”04.21 EDT”,”blockFirstPublishedDisplayNoTimezone”:”04.21″,”title”:”‘Significant impact’ of Heathrow closure, British Airways say”,”contributors”:[],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 EDT”},{“id”:”67dd1ee98f084e9a4f7160fe”,”elements”:[{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

We are also getting another line from UK energy secretary Ed Miliband doing the morning media round: he has told the LBC Radio that “there is no suggestion that there is foul play.”

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n

You may wonder whether that we know why this happened. At the moment, the focus is on restoring the power, we don’t yet have any understanding or real understanding of what caused … the fire.

n

“,”elementId”:”303437cd-046e-4ef1-9393-d0aca3dde9f2″},{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

He was then pressed further if he can rule out foul play, to which he responded:

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n

I have no… There’s no suggestion that there is foul play.

n

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Adding:

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n

That is, I mean, the conversation I’ve had is with the National Grid, the chief executive of the National Grid, and certainly that’s what he said to me.

n

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London fire brigade has now confirmed that the fire in Hayes is “now under control,” adding that the emergency services “will remain on scene throughout the day.”

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“Our fire investigators will begin their investigation & we will continue working closely with our partners to minimise disruption and support the community,” they said in a social media update.

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A statement on their website confirmed the fire was brought under control by 6:28 GMT, and added that “The Brigade’s fire investigators are working closely with the Metropolitan Police Service on the investigation into the cause of the fire.”

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UK energy secretary Ed Miliband appeared on BBC One in the last half hour, where he called the fire as “catastrophic,” and explained that it also affected “the potential backup generation” for the airport.

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He said:

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n

The [National] Grid is doing everything they can to restore power as quickly as they can to Heathrow.

n

Heathrow is saying that the airport will be closed today until midnight, as you know, but the grid are doing everything they can to seek to restore power.

n

My understanding from Grid is 100,000 homes were without power as a result of this fire overnight.

n

The figure they gave to me a short time ago was that that’s down now to 4,000 but obviously this is a fast moving situation.

n

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UK transport secretary Heidi Alexander has just commented on the Heathrow closure, urging passengers not to travel to the airport.

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She said:

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n

I’m receiving updates on the fast-moving situation at Heathrow Airport.

n

I’m grateful to emergency services responding to the fire, and National Grid for working to restore power to the airport and homes.

n

I’d urge passengers not to travel to the airport, and contact their airline.

n

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London Stansted airport is still open but has not yet received any requests for diverted flights. A spokesperson said: “London Stansted is currently operating as normal, we have capacity for a small number of diverts but as yet we haven’t received any requests.”

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What started off as a fire at a electrical substation in Hayes, West London, has caused Heathrow, one of the world’s busiest airports, to close until midnight on Friday. The substation supplies power to the major aviation hub.

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If you are just tuning in, or waking up in the UK, here is what you need to know:

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    n

  • n

    In the early hours of Friday morning Heathrow airport announced that the airport would be closed until midnight on Friday due to a “significant power outage” caused by a substation fire.

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    The shutdown occurred just hours before the global travel hub was due to open, forcing at least 120 flights that were already in the air to divert, according to Flightradar24.

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    A spokesperson for the airport has told passengers not to travel to the airport “under any circumstances” and warned that “significant disruption” is expected in the coming days.

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    Travel experts say the Heathrow closure will have a global impact, with dozens of air carriers forced to hurriedly reconfigure their networks to move planes and crews around as a result.

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    Already, scores of flights are being diverted to other airports, with Qantas Airways sending its flight from Perth to Paris and a United Airlines New York flight heading to Shannon, Ireland. Some flights from the US were turning around mid-air and returning to their point of departure. A United Airlines flight from San Francisco was due to land in Washington, D.C. rather than London. British Airways and Virgin Atlantic diverted flights to nearby Gatwick.

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    According to Flightradar24, more than 1,000 flights will be impacted by the sudden closure of Heathrow.

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    On the ground, the Hayes fire is also causing significant disruption with power outages impacting more than 16,300 homes. Footage posted to social media showed huge flames and large plumes of smoke coming from the substation facility. The fire brigade said nearly 200 calls had been received in relation to the incident with crews from Hayes, Heathrow, Hillingdon, Southall and surrounding areas on the scene.

    • n

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Elias Visontay, our transport and urban affairs reporter, has spoken to an aviation expert who says that airlines around the world will now be grappling with a “logistical nightmare”.

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Neil Hansford, head of the Sydney-based Strategic Aviation Solutions consultancy, said the closure of Heathrow for a day was “unheard of” for the industry.

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While London’s other airports, such as Gatwick and Stansted, would traditionally take diverted flights, Heathrow’s scale means other airports in and near London do not have the capacity to absorb all of its operations.

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“These airports can’t take anything close to the volume of Heathrow’s five terminals, where there’s an arrival every minute,” said Hansford.

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PHOTO: A general view Heathrow Airport near London, Britain 11 October, 2016.”,”caption”:”FILE PHOTO: A general view Heathrow Airport near London, Britain 11 October, 2016. “,”credit”:”Photograph: Stefan Wermuth/Reuters”}},{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

Hansford said that even if airports such as Amsterdam’s Schiphol and Paris’ Charles de Gaulle and Orly could handle diverted arrivals, it was unclear what they would do from there to return to their flight schedules.

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“If you land in Paris or Amsterdam, or even Manchester, how are you going to get your passengers and crew to London, and how are your outbound passengers and replacement crew going to get to the other city? Trains cannot do all of that moving. Every airline will be facing this problem today. Airlines base their staff in certain cities they fly to, but they may not have any staff in the cities they have to divert to.”

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“Beyond positioning the crew, fuel will be a huge problem,” he added. “Airlines plan to refuel at Heathrow which has a huge supply, but other airports that accept diversions likely won’t be able to refuel all of these extra planes.”

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Hansford said that even if Heathrow resumed operations by Saturday, the cascading flight disruptions would ripple through global aviation schedules for days, if not longer.

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“It’s catastrophic for air traffic,” he said.

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Many of the Heathrow-bound flights have diverted to London’s Gatwick, as airports around the United Kingdom and Europe brace for an influx of unexpected passengers.

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A statement from a London Gatwick spokesperson said: “We are aware of the situation at Heathrow Airport today and we are supporting by accepting diverted flights as required. Flights are operating from London Gatwick as normal today.”

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London Gatwick has so far accepted seven diverted flights originally scheduled to land at Heathrow, including flights from Singapore, Johannesburg, Lagos, Cape Town and Doha.

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Meanwhile, other flights have diverted to Paris, among other cities.

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Airlines’ carefully choreographed networks depend on airplanes and crews being in specific locations at specific times. Dozens of air carriers will have to hurriedly reconfigure their networks to move planes and crews around after the Heathrow closure.

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“The other question is, ‘What will airlines do to deal with the backlog of passengers?’”, said travel industry analyst Henry Harteveldt with Atmosphere Research Group. “It’s going to be a chaotic couple of days.”

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PHOTO: A passenger plane flies over horses feeding as it makes its landing approach to Heathrow Airport in west London, Britain, 28 January, 2025.”,”caption”:”FILE PHOTO: A passenger plane flies over horses feeding as it makes its landing approach to Heathrow Airport in west London, Britain, 28 January, 2025. “,”credit”:”Photograph: Toby Melville/Reuters”}}],”attributes”:{“pinned”:false,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742533380000,”blockCreatedOnDisplay”:”01.03 EDT”,”blockLastUpdated”:1742533524000,”blockLastUpdatedDisplay”:”01.05 EDT”,”blockFirstPublished”:1742533525000,”blockFirstPublishedDisplay”:”01.05 EDT”,”blockFirstPublishedDisplayNoTimezone”:”01.05″,”title”:”Travel experts say the disruption will extend far beyond Heathrow”,”contributors”:[],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 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Some more details from Flightradar24, which says that more than 1,000 flights will be impacted by the sudden closure of Heathrow today.

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“Today’s total closure of London-Heathrow will affect at least 1,351 flights to/from LHR,” the flight tracker said in a post on Bluesky, “That doesn’t include any flights that might be canceled or delayed due to aircraft being out of position.”

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It’s going to be a chaotic day for some travellers with flight tracking website Flightradar24 saying that at least 120 flights in the air bound for Heathrow will have to divert due to the airport closure.

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Scores of flights are already being diverted to other airports, with Qantas Airways sending its flight from Perth to Paris and a United Airlines New York flight heading to Shannon, Ireland. Some flights from the US were turning around mid-air and returning to their point of departure.

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A United Airlines flight from San Francisco was due to land in Washington, D.C. rather than London. British Airways and Virgin Atlantic diverted flights to nearby Gatwick.

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Heathrow is one of the busiest two-runway airports in the world with about 1,300 combined take-offs and landings a day, according to its website.

n “Heathrow is one of the major hubs of the world,” said Ian Petchenik, spokesman for FlightRadar24. “This is going to disrupt airlines’ operations around the world.”

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radar map of flights into Heathrow”,”caption”:”Flight radar map of flights into Heathrow”,”credit”:”Photograph: Bluesky”}}],”attributes”:{“pinned”:false,”keyEvent”:true,”summary”:false},”blockCreatedOn”:1742529413000,”blockCreatedOnDisplay”:”23.56 EDT”,”blockLastUpdated”:1742530873000,”blockLastUpdatedDisplay”:”00.21 EDT”,”blockFirstPublished”:1742530053000,”blockFirstPublishedDisplay”:”00.07 EDT”,”blockFirstPublishedDisplayNoTimezone”:”00.07″,”title”:”At least 120 flights diverted”,”contributors”:[],”primaryDateLine”:”Fri 21 Mar 2025 08.27 EDT”,”secondaryDateLine”:”First published on Thu 20 Mar 2025 23.22 EDT”},{“id”:”67dcd5998f080f2f26ae1547″,”elements”:[{“_type”:”model.dotcomrendering.pageElements.TextBlockElement”,”html”:”

Hello and welcome to our live coverage of the closure of Heathrow airport following a fire at an electricity substation in Hayes. The fire led to a power outage that has left the airport without electricity.

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Airport operators said the travel hub would be closed until midnight on March 21. Significant disruption to travel is expected and passengers should avoid the airport.

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Fire crews are responding to the accident but there is no clarity on when power may be reliably restored, a Heathrow spokesperson told Reuters in an email, and added that they expect significant disruption over the coming days.

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Eurocontrol, which manages air traffic control operations across Europe, said on its operations website that no arrivals were being allowed at Heathrow due to the power outage and there were diversion plans in place for flights.

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Heathrow was the world’s second-busiest international airport in 2024 behind Dubai, according to travel data firm OAG.

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The London Fire Brigade said its crews was tackling the fire in Hayes in west London and had evacuated around 150 people as a precaution.

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Here is the full report:

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Key events

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Ofgem to commission review of Hayes substation blaze

Jillian Ambrose

Electricity workers at the North Hyde electrical substation which caught fire.
Electricity workers at the North Hyde electrical substation which caught fire. Photograph: Andrew Matthews/PA

The energy regulator, Ofgem, has promised to commission a review of the substation blaze which left up to 100,000 people without power and ground Heathrow airport to a halt.

Akshay Kaul, the director general for infrastructure at Ofgem, said: “We are clear the top priority is reconnecting both domestic and business customers, including Heathrow airport, as soon as possible and that vulnerable customers are supported in the meantime.”

“Once power is restored, we will commission a review to understand the cause of this incident and what lessons can be learned.”

Tens of thousands of customers have already had their power restored with restoration of supplies to the remaining 500 customers and Heathrow airport underway.

Energy industry experts have questioned why Heathrow was so vulnerable to a major fault at one of National Grid’s substation within the local network with no immediate alternative electricity routes available through the local networks.

Kaul said: “We expect network operators to keep their customers fully updated on the support available, including welfare provision, and when power will be restored.”

Met’s counter-terrorism command leads the investigation, police says, but ‘no indication of foul play’

The Metropolitan police has now confirmed that the counter-terrorism command is leading inquiries as to the source of fire at the substation in Hayes, while stressing there is “currently no indication of foul play.”

A spokesperson for the Met said:

“We are working with the London fire brigade to establish the cause of the fire which remains under investigation. While there is currently no indication of foul play we retain an open mind at this time.

Given the location of the sub-station and the impact this incident has had on critical national infrastructure, the Met’s counter-terrorism command is now leading inquiries.

This is due to the specialist resources and capabilities within that command that can assist in progressing this investigation at pace to minimise disruption and identify the cause.”

‘Clear planning failure’ if Heathrow depends on single power source

International Air Transport Association, the trade association for airlines, said it would be a “clear planning failure” if Heathrow turned out to be “dependent on a single power source without an alternative.”

“From that arises the question of who bears the costs of taking care of disrupted travellers. We must find a fairer allocation of passenger care costs than airlines alone picking up the tab when infrastructure fails. Until that happens, Heathrow has very little incentive to improve,” IATA’s director general Willie Walsh said in a statement.

Walsh added that “today’s closing of Heathrow will inconvenience a huge number of travellers,” as he called it a “yet another case of Heathrow letting down both travelers and airlines.”

Passengers at Hatton Cross Underground station pass a notice advising people not to travel to Heathrow Airport in London.
Passengers at Hatton Cross Underground station pass a notice advising people not to travel to Heathrow Airport in London. Photograph: Tolga Akmen/EPA

Counter-terrorism involvement ‘routine’ and ‘nothing more than precaution’

Vikram Dodd

Vikram Dodd

Investigators continue to believe the fire was not the result of a deliberate act, but stress inquiries are at an early stage.

Detectives from Scotland Yard’s counter-terrorism command are being deployed as part of the investigation, but that is described as routine and nothing more than a precaution.

Counter-terrorism detectives bring some specialist skills but also they have the security clearance to access sensitive material as investigators try to establish the fire’s cause.

Authorities, including from the intelligence service, are monitoring and would be updated if the police led investigation suggests anything suspicious led to the fire.

Heathrow is part of the UK’s critical national infrastructure and thus a potential target for terrorism or sabotage in pursuance of a cause. Espionage and sabotage in the UK backed by state actors has risen in recent years.

A police officer and firefighters at the North Hyde electrical substation which caught fire.
A police officer and firefighters at the North Hyde electrical substation which caught fire. Photograph: Andrew Matthews/PA

Prime minister Starmer ‘receiving regular updates’ on Heathrow outage

UK prime minister Keir Starmer has posted an update on Heathrow outage, saying he is “receiving regular updates” on the incident.

Here is what he said:

“I know the situation in Heathrow is causing distress and disruption, especially for those travelling or without power in their homes. I’m receiving regular updates and I’m in close contact with partners on the ground. Thanks to our emergency workers for keeping people safe.”

What are your rights after flight cancellations?

Zoe Wood

Zoe Wood

A passenger stands outside Terminal 3 at Heathrow Airport.
A passenger stands outside Terminal 3 at Heathrow Airport. Photograph: Tolga Akmen/EPA

Travellers have woken up to the news that Heathrow airport is closed due to a nearby fire. Friday is usually the busiest day of the week for travel as people return from business trips or head off on holiday, with more than 1,350 flights due to take off and land.

If you are among the up to 291,000 passengers whose flights have been disrupted by the power outage, you have significant rights in relation to replacement flights, refunds and general customer care.

During the briefing, Smith reveals that firefighters evacuated 29 people from neighbouring properties and established a 200-meter cordon as a precaution, with further 150 people evacuated to a rest centre.

No injuries were reported, he confirmed.

That concludes the LFB’s briefing.

No air quality issues after Hayes substation fire, fire brigade says

London fire brigade’s assistant commissioner Smith is also asked about air quality consequences of the fire.

He insists that there were “no issues with the air quality as we stand,” and reassured reporters the LBF has “very good scientific advisers who advise us to make sure that we are doing what we need to ensure the quality of the air.”

He declined to respond to questions about any potential previous fires at the substation, whether the airport had sufficient backup power, and potential costs associated with the disruption.

During the Q&A, London fire brigade’s Smith gets also asked about an unconfirmed report by The Times that counter-terrorism police is part of the investigation, although the newspaper noted that this was understood to be “a precautionary measure rather than an indication of foul play.”

He says:

As you’ll appreciate, I won’t be able to comment on the investigations of the Metropolitan police.

All I can say is the Metropolitan police are investigating the cause of this fire, ably assisted by our fire investigation officers, and we will, of course, assist with that process.

‘25,000 litres of cooling oil alight’ in Hayes substation fire, London fire brigade says

London fire brigade is giving a press briefing just now, updating on its response to the incident.

Deputy commissioner Jonathan Smith says the service received over 200 calls to a fire, which involved a transformed “comprising of 25,000 litres of cooling oil, fully alight.”

He says this created “a major hazard due to the still live high voltage equipment and the nature of the oil fueled fire.”

“At the most recent update that I have received, approximately 10% remains alight,” he says.

He adds 67,000 households were left without power as a result of the fire, and 5,000 remain without power at the moment.

He confirms that there remains no power at Terminal 2 and Terminal 4 of Heathrow.

Smith says scientific advisers and the Metropolitan police are investigating the cause of the fire, and disruption is “expected to continue”.

Ryanair and Eurostar have decided to added extra connections to their schedules to help people stranded in London after the closure of Heathrow.

Ryanair said it would operate four extra flights between Dublin and Stansted on Friday afternoon and another four on Saturday morning.

In a statement to the Guardian, Eurostar confirmed plans to run one additional service from London to Paris (departing 3pm) and from Paris to London (departing 8pm), with 882 seats on each train.

‘Highly rare and unusual’ substation fire, scientists say

Helena Horton

Helena Horton

Electricity workers at the North Hyde electrical substation which caught fire.
Electricity workers at the North Hyde electrical substation which caught fire. Photograph: Andrew Matthews/PA

The substation fire which brought Heathrow to a standstill was highly rare and unusual, scientists have said.

“Fires like this are not common at all, as equipment is monitored to check its health and the equipment gets replaced once it starts showing signs of age that mean it could be dangerous (for obvious safety reasons),” said Dr Robin Preece, reader in future power systems at the University of Manchester, “Until the reports are completed by the equipment owners, it’s not possible to know the cause of the failure and the fire.”

Oil is used as an electrical insulator in these substations, he said, which means if there is a fire it becomes large and difficult to control: “The whole substation would probably need to be switched off and de-energised in order to let firefighters safely deal with the blaze. You cannot fight a fire in an electrical substation that is energised. Certainly all of the equipment adjacent to the transformer on fire would need to be de-energised.”

He said that “pretty much everyone” will be “back on supply very quickly” as there are sufficient alternate supplies on the electricity grid.

Dr Paul Cuffe, engineering professor at University College Dublin suggested Heathrow should have more resilient energy infrastructure to prevent these situations:

“One could argue that a critical piece of national infrastructure like Heathrow deserves special grid connection arrangements to secure its supply of electricity further. For instance, sometimes critical loads like this are fed from two separate substations to provide redundancy when outages happen. I am not familiar with the exact connection arrangements for Heathrow airport but neither setup would surprise me.”

“It is ultimately a political and economic question to determine the right level of capital investment into grid infrastructure to avoid the problems that outages like this cause. Redundant power supplies for an airport the size of Heathrow do not come free!”

Flights will be diverted across the UK and Europe, but because Heathrow is so massive, these airports will likely run out of capacity, said Dr Guy Gratton, associate professor of aviation and the environment, at Cranfield University.

He explained: “All airline flights must declare their destination and one or two ‘alternates’, which are airports they will go to in the event of problems at their destination. The UK has many large airports and flights have been diverting from Heathrow to airports at least as far away as Manchester. Alternates don’t have to be in the UK so for example Frankfurt or Schiphol may be used. With such a major airport closing however, there is significant risk of running out of capacity at those places.

“The absolute priority will of course be safety, with convenience to the passengers inevitably secondary to that. This is inevitably going to lead to significant disruption and frustrations.”

‘Significant disruption over coming days,’ London mayor says

London mayor Sadiq Khan said that Heathrow has warned “of significant disruption over the coming days,” as he thanked emergency services for responding to the fire at a substation.

Here is his statement in full:

Heathrow Airport is closed today due to a power outage caused by a fire at a nearby electrical substation. The fire is having a significant impact on the local area with the airport closed, other businesses affected and homes left without power.

I know this will be hugely frustrating for the many thousands expecting to travel to and from Heathrow today, the families who have had their power cut and the commuters who have had their journeys disrupted.

I’d like to thank the emergency services who have been working hard overnight to tackle the fire, and I remain in close contact with them, as I have been overnight. Thankfully, there are no reports of any injuries.

Electricity suppliers are working hard to restore power, but Heathrow Airport have said they will be closed all day and has warned of significant disruption over the coming days.

Passengers are advised not to travel to the airport under any circumstances and I urge Londoners to follow the advice of emergency services and their travel providers.

Closed Heathrow airport – in pictures

Departure boards and other screens are dark as Heathrow airport experienced a significant power outage in the early hours.
Departure boards and other screens are dark as Heathrow airport experienced a significant power outage in the early hours. Photograph: Klara Simonova/Getty Images
Departure boards and other screens are dark at Heathrow airport.
Departure boards and other screens are dark at Heathrow airport. Photograph: Klara Simonova/Getty Images
A service information notice in the Underground Station at Terminal 5 at Heathrow Airport.
A service information notice in the Underground Station at Terminal 5 at Heathrow Airport. Photograph: Tolga Akmen/EPA

A local resident said a “bright flash of white” from the electrical substation fire in Hayes preceded an immediate power cut across the area.

Mathew Muirhead was working a night shift on Thursday when he noticed smoke rising from the electrical substation.

“We were stood outside our branch in Hayes and my colleague noticed smoke coming over the trees,” the 42-year-old told PA.

“It was 23.30 when we saw it, we were heading to West Drayton, so we went to check it out, we heard the sirens as we were headed to Bulls Bridge roundabout.

“We saw a bright flash of white and all the lights in town went out.”

“My wife rang me and told me our electric was out – I found out a few hours later that Heathrow was completely shut down.”

Foam at the North Hyde electrical substation which caught fire.
Foam at the North Hyde electrical substation which caught fire. Photograph: Jonathan Brady/PA

Source: www.theguardian.com