The blaze that saw the lights go out at Heathrow has been doused, but the impact of it continues to be felt.

Here’s a summary of Heathrow Airport's reopening plans:

• Europe’s busiest airport will reopen at 5pm local time.

• Some eight British Airways long-haul flights are expected to be among the first to fly, including a flight to Sydney.

• The airport says initial flights will focus on repatriating passengers diverted elsewhere in Europe and people shouldn’t go to the airport unless told by their airline.

It's been a chaotic day.

• Hundreds of thousands of passengers have had their plans affected, with some 1,300 flights disrupted.
• Counter-terror police are continuing to investigate the fire but say there's currently no suggestion of foul play.
• The UK’s Prime Minister has called for an investigation into the fire and has warned of delays and disruption in the coming days.

We'll leave our live coverage here for now, but keep an eye on the ABC News website and ABC app for the very latest updates.

Here is a round-up from Reuters on what individual airlines have said about the closure of Heathrow Airport today:

• British Airways: "We've been given clearance by Heathrow Airport to depart eight of our long-haul flights today from 7pm. We are now urgently contacting customers to let them know so they can make their way to the airport from 5pm."

• United Airlines: We will continue to adjust our flying schedule to London in close coordination with airport authorities. At this time, we expect to operate most scheduled Friday departures to London."

• Air India: "London Heathrow-bound AI129 from Mumbai is returning to Mumbai; AI161 from Delhi is diverting to Frankfurt. All our remaining flights to and from London Heathrow, including AI111 of this morning, have been cancelled for 21 March."

• Aer Lingus: "Cancelling all flights to and from London Heathrow Airport until further notice today following the closure of the airport by the authorities."

• Virgin Atlantic: "This has had a significant impact on our flying programme both into and out of Heathrow and all Virgin Atlantic arriving and departing flights are cancelled until midday on March 21, with the rest of today's schedule currently under review."

• Qantas: "Our Singapore-London and Perth-London services were diverted to Paris today, with buses arranged to take customers on to London."

• Scandinavian Airlines System: "All our 12 round trips are so far cancelled to and from Heathrow. We will keep affected passengers informed."

• Ryanair: The airline said in a post on X that it had added up to eight rescue flights between Dublin and London Stansted to rescue passengers affected by Heathrow's closure.

• Singapore Airlines: A spokesperson for the airline said four flights from Singapore to London were affected and four flights from London to Singapore had been cancelled.

• JetBlue: All JetBlue flights to and from Heathrow will be cancelled and additional flights may be scheduled once the airport reopens to accommodate affected passengers.

• Delta Air Lines: "Delta has suspended operations to Heathrow Airport and provided customers additional flexibility in rebooking their travel."

• American Airlines: "American issued a travel alert, providing additional flexibility for customers impacted by the London Heathrow Airport closure."

British Airways has said the airline has been given clearance for eight long-haul flights this evening. 

It added that only those with tickets for the following flights should go to the airport: 

BA015 to Sydney via Singapore

BA055 to Johannesburg

BA057 to Johannesburg

BA011 to Singapore

BA259 to Riyadh

BA045 to Cape Town

BA059 to Cape Town

BA249 to Buenos Aires via Rio de Janeiro

Heathrow Airport is to reopen at 5pm, local time. 

British Airways has begun contacting passengers and hopes to have eight long-haul flights scheduled this evening, from 7pm. 

A flight to Sydney is expected to be among them. 

While thousands of passengers grapple with ruined plans amid Heathrow's closure, it has faced extended challenges before.

The eruption of a volcano in Iceland caused a massive ash cloud to spread across Europe in 2010, causing trans-Atlantic air travel disruptions for months, including at Heathrow.

This fire isn't ideal, but it's unlikely to match that level of chaos.

Heathrow Airport apologised for the inconvenience caused by the shutdown and said airlines would aim to swiftly repatriate passengers whose flights were diverted. 

“We will now work with the airlines on repatriating the passengers who were diverted to other airports in Europe," it said in a statement.  

It added: "As the busiest airport in Europe, Heathrow uses as much energy as a small city, therefore getting back to a full and safe operation takes time. We apologise for the inconvenience caused by this incident.”

We can now bring you the full statement from Heathrow Airport.

"Following an earlier power outage, Heathrow is now safely able to restart flights," the statement posted on its website says.

"To maintain the safety of our passengers and colleagues, Heathrow will running a reduced operation prioritising repatriation and relocation of aircraft.

"Passengers should contact their airline for further information. We apologise for the inconvenience."

London's Heathrow Airport has released a statement saying it will resume flights.

It says it expects to run a full operation on Saturday, local time.

We will bring you more on this shortly.

While there's still no official word from Heathrow about when it will reopen, two airlines are expressing optimism they could be operating there soon.

A spokesperson for United Airlines says it expects its flights to be able to leave the US on Friday and land at Heathrow on Saturday morning, local time.

An Air Canada spokesperson said its regular flights to London Heathrow would resume on Friday afternoon, local time.

Reporting with Reuters

Firefighters were called to the "highly visible" blaze at the substation shortly after 11:30pm on Thursday night, local time.

Some 70 firefighters battled the blaze, which was brought under control by 8am Friday morning.

Despite that, authorities spent much of Friday restoring power to the area and Heathrow Airport, while airlines and passengers scrambled to rearrange plans.

Reporting with AFP