Power has been restored to sparked a wave of cancelled flights.

"We’re sorry for the disruption caused by a fire at our North Hyde substation and for the loss of power supplies in the area," National Grid UK said in a statement shared to X/. "Teams have been working around the clock to restore power as soon as possible.

"Working in partnership with the local network operator SSEN Distribution, the network has been reconfigured to restore all customers impacted, including the ability to resupply the parts of Heathrow airport that are connected to North Hyde. This is an interim solution while we carry out further work at North Hyde to return the substation and our network to normal operation.

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"We are continuing to work closely with all stakeholders to manage this incident, and are focused on returning to normal resilience levels as soon as possible."

Lights were seen coming back on at Terminal four with lifts at the multi-storey car park also working again. Further work will be needed to bring the services back to a normal level.

The fire was sparked at the National Grid facility in Hayes, west London, and had a knock-on effect with London bound flights being diverted to Amsterdam, Paris and Dublin. It is estimated as many as 220,000 passengers could have had their flights disrupted.

Mayor of London said 150 families had to be evacuated from their homes after the substation caught fire on Thursday night. Mr Khan told the PA news agency on Friday: “Because of the size of the fire, the fire brigade had a cordon around 200 metres away from the substation that unfortunately led to around 150 families being evacuated from their homes.

“The commissioner (Andy Roe) is hoping that most of those families can be allowed back into their homes during the course of the day and National Grid are working really hard to return power as soon as possible.”

A Heathrow Airport spokesperson previously said: "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. We expect significant disruption over the coming days and passengers should not travel to the airport under any circumstances until the airport reopens.

"We will provide an update when more information on the resumption of operations is available. We know this will be disappointing for passengers and we want to reassure that we are working as hard as possible to resolve the situation."

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