‘Catastrophic failure’ led to Heathrow power outage – with chances missed to prevent it
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.
The fire at Hayes electrical substation, which led to Heathrow Airport shutting down in March. Pic: @JoselynEMuirhe1/PA
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.
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Moment Heathrow substation ignites
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.
The North Hyde electrical substation which caught fire. File pic: PA
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.
Smoke rises following the fire
“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”.
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Heathrow bosses were ‘warned about substation’
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.
Stranded passengers at Heathrow Terminal 5 following the fire
Pic: PA
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”.
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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”.
The world’s most valuable company, and first to be valued at $4trn (£2.9trn), beat market expectations in keenly anticipated financial results.
Microchip maker Nvidia recorded revenues of $46.7bn (£34.6bn) in just three months up to July, latest financial data from the company showed, slightly better than Wall Street observers had expected.
The company’s performance is seen as a bellwether for artificial intelligence (AI) demand, with investors paying close attention to see whether the hype is overblown or if significant investment will pay off.
Originally a creator of gaming graphics hardware, Nvidia’s chips help power AI capability – and the UK’s most powerful supercomputer.
Nvidia’s graphics processors underpin products such as ChatGPT from OpenAI and Gemini from Google.
Other tech giants – Microsoft, Meta and Amazon – make up Nvidia’s biggest customers and are paying large sums to embed AI into their products.
Why does it matter?
Nvidia has been central to the boom in AI development and the surge in tech stock valuations, which has seen stock markets reach record highs.
It represents about 8% of the value of the US S&P 500 stock market index of companies relied on to be stable and profitable.
Strong results will continue to fuel record highs in the market. Conversely, results that fail to live up to the hype could trigger a market tumble.
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Nvidia itself saw its share price rise more than 40% over the past year. Its value impacts anyone with cash in the US stock market, such as pension funds.
The S&P 500 rose 14% over the past year, and the tech-company-heavy NASDAQ gained 21%, largely thanks to Nvidia.
As such, its earnings can move markets as much as major economic or monetary policy announcements, like an interest rate decision.
Sir Keir Starmer with NVIDIA chief Huang at London Tech Week. Pic: AP
What next?
Revenue rises are forecast to continue to rise as Nvidia said it expected a rise to roughly $54bn (£40bn) in the next three months, more than the $53.14bn (£39.3bn) anticipated by analysts.
This excludes any potential shipments to China as export of Nvidia’s H20 chip, designed with the Biden administration’s export crackdown on advanced AI powering chips in mind, had been banned under US national security grounds.
But in recent weeks, Nvidia and another chipmaker, AMD, reached an unprecedented agreement to pay the Trump administration a 15% portion of China sales in return for export licences to send chips to China.
There were no H20 sales at all to China in the second quarter of the year, the period for which results were released on Wednesday evening.
Previously, 13% of Nvidia’s revenue came from China, with nearly 50% coming from the US.
Market reaction
Despite the expectation-beating results, Nvidia shares were down in after-hours trading, as the massive revenue rises previously booked by the company were not repeated in the latest quarter.
Compared to a year ago, revenues rose 56% and 6% compared to the three months up to April.
The absence of Chinese sales in forecasts appeared to disappoint.
A larger than expected hike in the energy price cap from October is largely down to higher costs being imposed by the government.
The typical sum households face paying for gas and electricity when using direct debit is to rise by 2% – or £2.93 per month – to £1,755, the energy watchdog Ofgem announced.
The current price cap is £1,720 a year. A 1% increase had been widely forecast.
The latest bill settlement, covering the final quarter of the year until the next price review takes effect from January, will affect around 20 million households.
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There are 14 million others, such as those on pre-payment meters, who will also see bills rise by a similar level.
Those on fixed deals, which are immune from price cap shifts until such time as the term ends, currently stands at 20 million.
Wholesale prices – volatile since Russia’s invasion of Ukraine back in February 2022 – have been the main driver of rising bills.
But they are making little contribution to the looming increase.
Ofgem explained that government measures, such as the expansion of the warm home discount announced in June, were mainly responsible.
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The discount is set to add £15 to the average annual bill.
It will provide £150 in support to 2.7 million extra people this year, bringing the total number of beneficiaries to six million.
The balance is made up from money needed to upgrade the power network.
Tim Jarvis, director general of markets at Ofgem, said: “While there is still more to do, we are seeing signs of a healthier market. There are more people on fixed tariffs saving themselves money, switching is rising as options for consumers increase, and we’ve seen increases in customer satisfaction, alongside a reduction in complaints.
“While today’s change is below inflation, we know customers might not be feeling it in their pockets. There are things you can do though – consider a fixed tariff as this could save more than £200 against the new cap. Paying by direct debit or smart pay as you go could also save you money.
“In the longer term, we will continue to see fluctuations in our energy prices until we are insulated from volatile international gas markets. That’s why we continue to work with government and the sector to diversify our energy mix to reduce the reliance on markets we do not control.”
The looming price cap lift will leave bills around the same sort of level they were in October last year but it will take hold at a time when overall inflation is higher.
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Food price increases, also partly blamed on government measures such as the national insurance contributions hike imposed on employers, have led the main consumer prices index to a current level of 3.8%.
It is predicted to rise to at least 4% in the coming months, further squeezing household budgets.
Ministers argue that efforts to make the UK less reliant on natural gas, through investment in renewable power sources, will help bring down bills in future.
Energy minister Michael Shanks said: “We know that any price rise is a concern for families. Wholesale gas prices remain 75% above their levels before Russia invaded Ukraine. That is the fossil fuel penalty being paid by families, businesses and our economy.
“That is why the only answer for Britain is this government’s mission to get us off the rollercoaster of fossil fuel prices and onto clean, homegrown power we control, to bring down bills for good.
“At the same time, we are determined to take urgent action to support vulnerable families this winter. That includes expanding the £150 Warm Home Discount to 2.7 million more households and stepping up our overhaul of the energy system to increase protections for customers.”
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