London: Britain’s Heathrow airport, Europe’s busiest, was shut down early Friday for 24 hours after a major fire at an electricity substation cut power to the sprawling facility west of London, officials said.
Airport authorities said they “expect significant disruption” over the coming days, with hundreds of flights and thousands of passengers affected.
“Heathrow is experiencing a significant power outage,” the airport operator said in a statement on its website, adding it would be closed until just before midnight Friday (2359 GMT).
“Passengers should not travel to the airport under any circumstances until the airport reopens.”
Online flight tracking service FlightRadar24 said Heathrow’s closure would affect at least 1,351 flights to and from the airport.
It said 120 flights to the airport were in the air when the closure was announced.
London Fire Brigade said there had been a “significant” fire at a substation in Hayes, a nearby town in the London borough of Hillingdon, which caused the power outage.
It said 10 fire engines and around 70 firefighters were on the scene, while around 150 people had been evacuated from nearby properties.
Images on social media — which could not immediately be verified by AFP — showed huge flames and smoke rising from the substation.
Other videos, apparently shot inside Heathrow’s terminals, showed shuttered shops and deserted corridors, lit only by emergency lighting.
“The fire has caused a power outage affecting a large number of homes and local businesses, and we are working closely with our partners to minimize disruption,” said London Fire Brigade assistant commissioner Pat Goulbourne.
He said the blaze was first reported at 11:23 p.m. (2323 GMT).
“This is a highly visible and significant incident, and our firefighters are working tirelessly in challenging conditions to bring the fire under control as swiftly as possible,” a statement said.
British utility firm Scottish and Southern Electricity Networks said on its website that an “unplanned outage” had left more than 16,000 homes without power in the area.

Heathrow handles more than than 80 million passengers a year and the operator says there are around 1,300 takeoffs or landings a day.
Seven United Airlines flights returned to their airport of origin or to other airports and all Friday flights to London Heathrow are being canceled, a spokesperson said.
In Sydney, Qantas said two flights en route to Heathrow — a non-stop flight from Perth and another via Singapore — had both diverted to Paris’ Charles de Gaulle airport.
It said two other flights scheduled to fly out of London on Friday were likely to be impacted.
In January, the government gave permission for Heathrow to build a third runway — which could be ready by 2035 — after years of legal wrangling brought on by complaints from local residents.
Five major airports serve the capital and towns nearby.
But capacity is stretched, especially at Heathrow whose two runways each measure almost four kilometers in length, while the airport covers a total area 12.3 square kilometers.
It opened in 1946 as London Airport before being renamed Heath Row, a hamlet demolished two years earlier to make way for the construction.
Situated 25 kilometers (15 miles) west of central London, the present Heathrow serves 200 destinations in more than 80 countries, with passengers having access to four terminals.
Among its main flight destinations last year were Dublin, Los Angeles, Madrid and New York.

US safety regulators on Thursday recalled virtually all Cybertrucks on the road, the eighth recall of the Tesla-made vehicles since deliveries to customers began just over a year ago.
The National Highway Traffic Safety Administration’s recall, which covers more than 46,000 Cybertrucks, warned that an exterior panel that runs along the left and right side of the windshield can detach while driving, creating a dangerous road hazard for other drivers, increasing the risk of a crash.
The stainless steel strip, called a cant rail assembly, between the windshield and the roof on both sides, is bound to the truck’s assembly with a structural adhesive, the NHTSA report said. The remedy uses an adhesive that’s not been found to be vulnerable to “environmental embrittlement,” the NHTSA said, and includes additional reinforcements.
Tesla will replace the panel free of charge. Owner notification letters are expected to be mailed May 19, 2025.
The recall of 46,096 Cybertrucks covers all 2024 and 2025 model years, manufactured from November 13, 2023, to February 27, 2025. The NHTSA order says that Tesla became aware of the problem early this year.
Videos posted on social media showing people ripping the panels off of Cybertrucks with their hands have gone viral in recent days.

The Cybertruck, which Tesla began delivering to buyers in late 2023, has been recalled eight times in the past 15 months for safety problems, including once in November because a fault in an electric inverter can cause the drive wheels to lose power. Last April, the futuristic-looking trucks were recalled to fix acceleration pedals that can get stuck in the interior trim. Other recalls were related to windshield wipers and the display screen.
It’s the latest setback for the Elon Musk-owned electric automaker, which has come under attack since President Donald Trump took office and empowered Musk to oversee a new Department of Government Efficiency that’s slashing government spending.
While no injuries have been reported, Tesla showrooms, vehicle lots, charging stations and privately owned cars have been targeted.
Prosecutors in Colorado charged a woman last month in connection with attacks on Tesla dealerships, including Molotov cocktails thrown at vehicles and the words “Nazi cars” spray-painted on a building.
And federal agents in South Carolina last week arrested a man they say set fire to Tesla charging stations near Charleston. An agent from the Bureau of Alcohol, Tobacco, Firearms and Explosives wrote in an affidavit that authorities found writings critical of the government and DOGE in his bedroom and wallet.
Even before the attacks ramped up in recent weeks, Tesla has been struggling, facing increased competition from rival electric vehicles, particularly out of China.
Though largely unaffected by Thursday’s recall announcement, Tesla shares have plummeted 42 percent in 2025, reflecting newfound pessimism as sales crater around the globe.
With regard to Thursday’s recall, Cybertruck owners may contact Tesla customer service at 1-877-798-3752 and the National Highway Traffic Safety Administration Vehicle Safety Hotline at 888-327-4236, or go to nhtsa.gov.