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    Home»Earnings»Five takeaways from report into fire that shut Heathrow down
    Earnings

    Five takeaways from report into fire that shut Heathrow down

    onlyplanz_80y6mtBy onlyplanz_80y6mtJuly 2, 2025No Comments3 Mins Read
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    Five takeaways from report into fire that shut Heathrow down
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    Ben KingTransport correspondent, BBC NewsGetty ImagesA report into a fireplace at an electrical energy substation that resulted in Heathrow Airport shutting down for almost a day, inflicting chaos for greater than 200,000 passengers, has been launched.The Nationwide Power System Operator (NESO) recognized the doubtless reason for the fireplace, and mentioned that Nationwide Grid which operates the substation was warned a couple of fault seven years in the past. Listed here are 5 key findings from the report.1. The hearth was attributable to moistureThe NESO report answered one of many key questions – what triggered the fireplace?The system which caught hearth was a “supergrid transformer”, which takes excessive voltage electrical energy from the transmission grid and reduces it to a decrease voltage for the subsequent stage of its path to Heathrow Airport and surrounding homes.Inspectors mentioned the doubtless trigger was moisture entering into the high-voltage “bushing” – insulation across the connections.That triggered a short-circuit and “arcing” – electrical sparks like these in a spark plug – which resulted in a “catastrophic failure”.That triggered the oil which is used to chill the transformer to catch hearth, and took two transformers offline, slicing energy to Heathrow.2. Nationwide Grid knew about the issue seven years earlier than the fireThe report mentioned indicators of moisture had been detected at North Hyde in July 2018. Nationwide Grid’s steerage mentioned these had been “an imminent fault” that must be changed. However the challenge wasn’t mounted on the time.In 2022, fundamental upkeep on the transformer was deferred. A number of additional makes an attempt had been made to schedule upkeep, however none went forward.3. Heathrow knew an issue with one in all its three grid connections would shut the airportHeathrow makes use of as a lot electrical energy as a small metropolis, and it has three connections to the nationwide grid. But it surely new that if one in all them went down, it must shut the airport for 10 to 12 hours whereas key techniques had been linked to the opposite sources of provide.It didn’t assume it was a probable situation, so it was not thought of worthwhile to spend the cash to repair it – which Heathrow has beforehand mentioned would have value a billion kilos. NESO mentioned having three connections to the grid meant there have been “alternatives” to enhance Heathrow’s resilience of provide. 4. Nationwide Grid did not understand how vital the substation wasNational Grid and the vitality provider SSEN knew that electrical energy from North Hyde went to Heathrow Airport. However they didn’t know that Heathrow must shut down if that offer was interrupted. Maybe if they’d, they’d have taken a special strategy to upkeep. Power suppliers don’t at present know if their clients are counted as “important nationwide infrastructure (CNI)” – sectors corresponding to transport, defence, authorities or communications. The report calls higher communications between CNI operators and their vitality suppliers to make sure that provides don’t get interrupted.5. Heathrow shouldn’t be happyHeathrow got here beneath numerous criticism after the fireplace – together with the revelation that the chief govt Thomas Woldbye was asleep in mattress when the choice was taken to shut the airport. NESO mentioned its report was not written to “apportion blame”, however Heathrow says it’s now contemplating authorized motion in opposition to Nationwide Grid. In its view the report described “clear and repeated failings” which “may and may” have prevented the fireplace. It mentioned it anticipated Nationwide Grid to “take duty for these failings.” Nationwide Grid mentioned it had a complete upkeep programme, and would co-operate carefully with the Ofgem investigation.

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