Fire at Power Substation Shuts Down Heathrow Airport, Disrupting Flights

London’s Heathrow Airport (LHR), one of the world’s busiest airports and a key hub for Indian travelers, was forced to close temporarily following a fire at a nearby power substation. The incident caused significant flight disruptions throughout the day.

“Heathrow is experiencing a significant power outage across the airport due to a large fire at a nearby electrical substation. Whilst fire crews are responding to the incident, we do not have clarity on when power may be reliably restored. To maintain the safety of our passengers and colleagues, we have no choice but to close Heathrow until 23h59 on 21 March 2025,” the airport stated.

Heathrow serves as a major gateway for travel between India and the UK and acts as a transit point for flights to Europe and the US.

Impact on Flights Between India and Heathrow

According to Cirium, an aviation analytics company, 37 two-way flights between India and Heathrow were scheduled for Friday. Air India had six flights planned with a total of 1,843 seats. Heathrow operates 1,186 flights between India and the UK in March alone.

Air India, British Airways, and Virgin Atlantic operate direct flights between India and Heathrow. British Airways has eight daily flights, while Virgin Atlantic operates five daily non-stop flights from Delhi, Mumbai, and Bengaluru.

Air India reported that its operations were severely affected. “Our operations to and from LHR have been disrupted following the temporary suspension of operations at the airport until 23h59 London time of 21 March… Consequently, Heathrow-bound AI129 from Mumbai is returning to Mumbai; AI161 from Delhi is getting diverted to Frankfurt. All our remaining flights to and from London Heathrow, including AI111 this morning, have been cancelled for 21 March… Flights to London’s Gatwick remain unaffected,” the airline said.

Cirium estimated that 699 flights were scheduled to depart from Heathrow on Friday, with approximately 145,000 passengers affected.

British Airways and Virgin Atlantic Respond

A British Airways spokesperson stated that passengers scheduled to fly from Heathrow on Friday should not travel to the airport.

“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,” the spokesperson said.

Virgin Atlantic also confirmed the disruption, stating that all arriving and departing flights were cancelled until 21:30 on 21 March. “Unfortunately, this has had a significant impact on our flying programme, both to and from Heathrow,” a spokesperson noted.

Mumbai’s Chhatrapati Shivaji Maharaj International (CSMI) airport issued an advisory, asking passengers to contact their airlines for updates on flight schedules.

Passenger Experience and Flight Diversions

Debasish Chakraverty, a Mumbai resident, was aboard Virgin Atlantic flight VS359 from Mumbai to London when the pilot announced that the flight would return to Mumbai.

“As an Indian American who has lived through the aftermath of 9/11, my first thoughts were that this might be something of a similar magnitude. However, I had opted for Wi-Fi onboard and was able to learn the actual reason,” he said.

Air India’s flight from Delhi was diverted to Frankfurt, leaving passengers stranded. “The passengers were given accommodation, but the status of the flight will be updated once a communication from LHR is received,” an airline official stated.

Cirium reported that fewer flights were scheduled for Saturday. “There are 615 flights scheduled to depart from LHR tomorrow, (with 136,951 seats) and 604 flights scheduled to land in LHR with 134,726 seats,” it noted.

Heathrow Resumes Operations After Outage

By Saturday, Heathrow had resumed full operations after the power outage. British Airways expected to run about 85% of its schedule. Power was restored to Heathrow by National Grid UK’s North Hyde substation, allowing normal airport operations to resume.

“We have hundreds of additional colleagues on hand in our terminals and we have added flights to today’s schedule to facilitate an extra 10,000 passengers traveling through the airport,” a Heathrow spokesperson said. Heathrow advised passengers to check with their airlines for the latest updates.

The Metropolitan Police confirmed that its counter-terrorism command was investigating the fire at the power substation but noted that there was no indication of foul play.

Financial and Operational Impact

The incident caused over 1,300 flights to be cancelled or rerouted on Friday alone.

Heathrow, a major hub for transatlantic travel and connections to the Middle East and Asia, faced major disruptions. Some flights were diverted to nearby airports like London Gatwick, while others were sent as far as Frankfurt.

“This incident will have a substantial impact on our airline and customers for many days to come, with disruption to journeys expected over the coming days,” said British Airways chief Sean Doyle. The airline planned to operate nearly 600 flights on Saturday.

The financial impact of the disruption could reach between $80 million and $100 million, factoring in costs for accommodation, food, transportation, and operational adjustments, said Ronan Murphy, director at Alton Aviation Consultancy.

Challenges for Heathrow’s Infrastructure

The scale of the outage raised questions about Heathrow’s infrastructure and backup systems. Energy Secretary Ed Miliband stated that the fire damaged both the power substation and a backup generator.

Prime Minister Keir Starmer said he was receiving regular updates and remained in contact with authorities.

The police said they were conducting assessments to determine whether the circumstances were suspicious but found no immediate evidence of foul play.

Heathrow has long sought to add a third runway to expand its capacity and maintain competitiveness with other global hubs like Dubai and Istanbul.

Its main investors include French private equity firm Ardian SAS, Qatar Investment Authority, and Saudi Arabia’s Public Investment Fund.

Passenger Stories and Disruptions

Passengers faced major disruptions. Sue Thomas, who arrived from Canada, reported that power went out at her hotel near Heathrow on Thursday night. “Everything went black,” she said. The lifts stopped working, and the corridors were completely dark.

Nick Stone, an investor from Los Angeles, missed his daughter’s 12th birthday due to the disruption. “My flight was cancelled, and now I’m trying to figure out an alternative,” he said.

Eurostar and other carriers added extra capacity to accommodate stranded travelers. Ryanair added additional flights between London Stansted and Dublin, while EasyJet increased seat availability on key routes.

Even after Heathrow reopened, delays and disruptions were expected to continue for several days as airlines worked to reposition aircraft and crew.