‘Catastrophic failure’ led to Heathrow power outage – with chances missed to prevent it

Published

1 week ago

July 2, 2025

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A power outage that shut Heathrow Airport earlier this year, causing travel chaos for more than 270,000 passengers, was caused by a “catastrophic failure” of equipment in a nearby substation, according to a new report.

Experts say the fire at the North Hyde Substation, which supplies electricity to Heathrow, started following the failure of a high-voltage electrical insulator known as a bushing, before spreading.

The failure was “most likely” caused by moisture entering the equipment, according to the report.

National Grid, which owns the substation, missed two opportunities to prevent the failure, experts found, the first in 2018 when a higher-than-expected level of moisture was found in oil samples.

Such a reading meant “an imminent fault and that the bushing should be replaced”, according to guidance by the National Grid Electricity Transmission.

However, the report by National Energy System Operator (NESO) said the appropriate responses to such a serious issue were “not actioned”, including in 2022 when basic maintenance was postponed.

“The issue therefore went unaddressed,” the report added.

The design and configuration of the airport’s internal power network meant the loss of just one of its three supply points would “result in the loss of power to operationally critical systems, leading to a suspension of operations for a significant period”, the report added.

Heathrow – which is Europe’s biggest airport – closed for around 16 hours on 21 March following the fire, before reopening at about 6pm.

Around 1,300 flights were cancelled and more than 270,000 air passenger journeys were disrupted.

Tens of millions of pounds were lost, thousands of passengers were stranded, and questions were raised about the resilience of the UK’s infrastructure.

More than 71,000 domestic and commercial customers lost power as a result of the fire and the resulting power outage, the report said.

NESO chief executive, Fintan Slye, said there “wasn’t the control within their [National Grid’s] asset management systems that identified that this [elevated moisture levels] got missed.

“They identified a fault, [but] for some reason the transformer didn’t immediately get pulled out of service and get repaired.

“There was no control within the system that looked back and said ‘oh, hang on a second, you forgot to do this thing over here’.”

Sky’s science and technology editor, Tom Clarke, pointed to the age of the substation’s equipment, saying “some of these things are getting really very old now, coming to the end of their natural lives, and this is an illustration of what can happen if they are not really well maintained”.

The report also highlights a lack of joined-up thinking, he said, as “grid operators don’t know who’s critical national infrastructure on the network, and they don’t have priority”.

Responding to the report’s findings, a Heathrow spokesperson said: “A combination of outdated regulation, inadequate safety mechanisms, and National Grid’s failure to maintain its infrastructure led to this catastrophic power outage.

“We expect National Grid to be carefully considering what steps they can take to ensure this isn’t repeated.

“Our own Review, led by former Cabinet Minister Ruth Kelly, identified key areas for improvement and work is already underway to implement all 28 recommendations.”

In May, Ms Kelly’s investigation revealed that the airport’s chief executive couldn’t be contacted as the crisis unfolded because his phone was on silent.

Energy Secretary Ed Miliband, who commissioned the NESO report, called it “deeply concerning”, because “known risks were not addressed by the National Grid Electricity Transmission”.

Mr Miliband said energy regulator Ofgem, which opened an investigation on Wednesday after the report was published, is investigating “possible licence breaches relating to the development and maintenance of its electricity system at North Hyde.

“There are wider lessons to be learned from this incident. My department, working across government, will urgently consider the findings and recommendations set out by NESO and publish a response to the report in due course.”

National Grid said in a statement it has “a comprehensive asset inspection and maintenance programme in place” and said it has “taken further action since the fire”.

This includes “an end-to-end review” of its oil sampling process and results, further enhancement of fire risk assessments at all operational sites, and “re-testing the resilience of substations that serve strategic infrastructure”.

A spokesperson said: “We fully support the recommendations in the report and are committed to working with NESO and others to implement them. We will also cooperate closely with Ofgem’s investigation.

“There are important lessons to be learnt about cross sector resilience and the need for increased coordination, and we look forward to working with government, regulators and industry partners to take these recommendations forward.”

The Metropolitan Police previously confirmed on 25 March that officers had “found no evidence to suggest that the incident was suspicious in nature”.

Business

Trump fires tariff threats at more nations as EU ‘ready for all scenarios’

Published

47 mins ago

July 9, 2025

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Trump fires tariff threats at more nations as EU 'ready for all scenarios'

Donald Trump has revealed a list of more nations set to face delayed ‘liberation day’ tariffs from 1 August.

He has threatened tariffs of 30% on Algeria, 25% on Brunei, 30% on Iraq, 30% on Libya, 25% on Moldova and 20% on the Philippines. Sri Lanka was later told it faced a 30% duty.

Letters setting out the planned rates – and warning against retaliation – are being sent to the leaders of each country.

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They were the latest to be informed of the president‘s plans after Japan and South Korea were among the first 14 nations to be told of the rates they must pay on their general exports to the US from 1 August.

The duties are on top of sectoral tariffs, covering areas such as steel and cars, already in place.

Mr Trump further warned, on Tuesday, that a 50% tariff rate on all copper imports to the US was looming.

He has also threatened a 200% rate on pharmaceuticals and is also expected to take aim at all imports of semiconductors too.

The European Union, America’s largest trading partner in combined trade, services and investment, is expected to get a letter within the next 48 hours unless further progress is made in continuing talks.

The bloc, which Mr Trump has previously claimed was created to “screw” the US, has been in negotiations with US officials for weeks and working to agree a UK-style truce by the end of the month.

The EU has retaliatory tariffs ready to deploy from 14 July but it is widely expected to delay them until such time that any heightened US duties are imposed.

It remains hopeful of a deal in the coming days but European Commission president Ursula von der Leyen told the European Parliament: “We stick to our principles, we defend our interests, we continue to work in good faith, and we get ready for all scenarios.”

While the UK’s so-called deal with Mr Trump is now in force, it remains unclear whether steelmakers will have to pay a 50% tariff rate, deployed by the US against the rest of the world, as some final details on an exemption are yet to be worked out.

The rate is currently 25%.

Business

Nvidia wins race to become first $4trn listed company

Published

4 hours ago

July 9, 2025

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Nvidia wins race to become first trn listed company

Nvidia has become the first stock market-listed company to achieve a value of $4trn.

Its share price rose by more than 2% at the market open on Wall Street to reach the milestone moment.

It was achieved just over a year since Nvidia overcame the $3trn barrier and overtook Apple, in market cap terms, in the process.

The AI-focused chipmaker has been the darling of Wall Street for many years.

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The value of its shares has risen by 409,825% since its market debut in 1999.

Its status has been cemented thanks to the rush for AI technology – suffering several wobbles along the way – but nothing significant when you refer to the percentage rise of the past 26 years.

The most recent pressures have come from the emergence of the low-cost chatbot DeepSeek and concerns for global AI demand as a result of Donald Trump’s trade war hitting growth.

Financial markets have been taking a more risk-on approach to the trade war since the delays to “liberation day” tariffs in April.

It’s explained by a market trend that’s become known as the TACO trade: Trump always chickens out.

It has helped US stock markets post new record highs in recent days.

The wave of optimism is down to the fact that the president is yet to follow through with the worst of his threatened tariffs on trading partners.

Corporations are also yet to report big hits to their earnings – a fact that is also propping up demand for shares.

If Mr Trump does go all-out in his trade war, as he has now threatened from 1 August, then that $4trn market value for Nvidia – and wider stock markets – could be short-lived, at least in the short term.

But market analysts believe Nvidia’s value has further to go.

Matt Britzman, senior equity analyst at Hargreaves Lansdown, said of its meteoric rise: “Once known for powering video games, NVIDIA has transformed into a foundational player in AI infrastructure.

“Its high-performance chips now drive everything from natural language processing to robotics, making them essential to training and deploying advanced AI models.

“Beyond hardware, its full-stack ecosystem – including software platforms and developer tools – helps companies scale AI quickly and efficiently. This end-to-end approach has positioned Nvidia as a cornerstone in a market where speed, scalability, and efficiency are critical.”

He added: “The key question is where it goes from here, and while it might seem strange for a company that’s just passed the $4trn mark, Nvidia still looks attractive.

“Growth is expected to slow, and it’s likely to lose some market share as competition and custom solutions ramp up. But trading at a relatively modest 32 times expected earnings, and over 50% top-line growth forecast this year, there’s still an attractive opportunity ahead.

“For investors, it remains a compelling way to gain exposure to the AI boom – not just as a participant, but as one of its architects.”

Business

Greater risk to UK economy following Trump’s tariffs, says Bank of England

Published

4 hours ago

July 9, 2025

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Greater risk to UK economy following Trump's tariffs, says Bank of England

The future of the UK economy is weaker and more uncertain due to President Trump’s tariffs and conflict in the Middle East, the Bank of England has said.

“The outlook for UK growth over the coming year is a little weaker and more uncertain,” the central bank said in its biannual health check of the UK’s financial system.

Economic and financial risks have increased since the last report was published in November, as global unpredictability continued after the announcement of country-specific tariffs on 2 April, the Bank’s Financial Stability Report said.

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These risks and uncertainty, as well as geopolitical tensions, like the wars in Ukraine and the Middle East, are “particularly relevant” to UK financial stability as an open economy with a large financial sector, it said.

Pressures on government borrowing costs are “still elevated” amid significant doubts over the global economic outlook.

Had a 90-day pause on tariffs not been announced, conditions could have worsened, the report added.

The chance of prices rising overall has also grown as tensions between Iran and Israel and the US threaten to push up energy prices.

Possible higher inflation in turn raises the prospect of more expensive borrowing from higher interest rates to bring down those price rises. This compounds the pressure on state borrowing costs.

Mortgages

Borrowing costs for about 40% of mortgage holders are set to become costlier over the next three years as households refix to more expensive deals, affecting 3.6 million households, the Bank said.

Many homes have not refixed their mortgage since interest rates began to rise in 2021, meaning the full impact of higher rates has yet to filter through.

Those looking to get on the property ladder got a boost as the Bank said lenders could issue more loans deemed to be risky, meaning people could be able to borrow more.

Financial institutions can now have 15% of their new mortgages deemed risky every year, up from the current 9.7%.

Riskier mortgages are those with a loan value above 4.5 times the borrower’s income.

Be ‘prepared for shocks’

Despite the global and domestic economy concerns, the outlook for UK household and business resilience remained “strong”, the Bank said.

Investors, however, were warned that there could be “sharp falls in risky asset prices”, which include shares and currencies.

If there are any vulnerabilities in non-bank lenders, it “could amplify such moves, potentially affecting the availability and cost of credit in the UK”.

“It is important that in their risk management, market participants [people involved in investing] are prepared for such shocks.”

The steep market reaction following the tariff announcements in April “highlights that the interconnectedness of global financial markets can mean stress from one market can move quickly to others,” the report said.

Overall, though, “household and corporate borrowers remain resilient”, the Bank concluded.