Latest news with #NorthHyde
Times
3 hours ago
- General
- Times
Is this a good time to buy shares in National Grid?
T his month's official report into the power cut at Heathrow airport in March made uncomfortable reading for National Grid. The company presents itself as the careful custodian of the high-voltage electricity network across England and Wales — yet the report by the National Energy System Operator gives the impression that it has been asleep on the job. The blaze in a transformer at National Grid's North Hyde substation that triggered the chaos was most likely to have been caused, Neso found, by moisture entering equipment known as a bushing, causing a short circuit and the ignition of oil within it. Moisture had been detected in oil samples in July 2018, indicating an 'imminent fault' that needed fixing — yet National Grid failed to do so for seven years. It deferred basic maintenance at the substation and failed to fix a fire suppression system that was found in 2022 to be 'inoperable'. Some 108 of National Grid's 805 transformers nationally are overdue maintenance, the report found, a proportion that's within the company's own limits but raises obvious questions about what risks may be going unaddressed.
BBC News
02-07-2025
- General
- BBC News
Five takeaways from report into fire that shut Heathrow down
A report into a fire at an electricity substation that resulted in Heathrow Airport shutting down for nearly a day, causing chaos for more than 200,000 passengers, has been National Energy System Operator (NESO) identified the likely cause of the fire, and said that National Grid which operates the substation was warned about a fault seven years ago. Here are five key findings from the report. 1. The fire was caused by moisture The NESO report answered one of the key questions – what caused the fire?The device which caught fire was a "supergrid transformer", which takes high voltage electricity from the transmission grid and reduces it to a lower voltage for the next stage of its route to Heathrow Airport and surrounding said the likely cause was moisture getting into the high-voltage "bushing" – insulation around the caused a short-circuit and "arcing" - electric sparks like those in a spark plug - which resulted in a "catastrophic failure".That caused the oil which is used to cool the transformer to catch fire, and took two transformers offline, cutting power to Heathrow. 2. National Grid knew about the problem seven years before the fire The report said signs of moisture were detected at North Hyde in July 2018. National Grid's guidance said these were "an imminent fault" that should be replaced. But the issue wasn't fixed at the 2022, basic maintenance on the transformer was deferred. Multiple further attempts were made to schedule maintenance, but none went ahead. 3. Heathrow knew a problem with one of its three grid connections would close the airport Heathrow uses as much electricity as a small city, and it has three connections to the national grid. But it new that if one of them went down, it would have to close the airport for 10 to 12 hours while key systems were connected to the other sources of did not think it was a likely scenario, so it was not considered worthwhile to spend the money to fix it – which Heathrow has previously said would have cost a billion pounds. NESO said having three connections to the grid meant there were "opportunities" to improve Heathrow's resilience of supply. 4. National Grid didn't know how important the substation was National Grid and the energy supplier SSEN knew that electricity from North Hyde went to Heathrow Airport. But they did not know that Heathrow would have to shut down if that supply was interrupted. Perhaps if they had, they would have taken a different approach to maintenance. Energy suppliers do not currently know if their customers are counted as "critical national infrastructure (CNI)" – sectors such as transport, defence, government or communications. The report calls better communications between CNI operators and their energy suppliers to ensure that supplies do not get interrupted. 5. Heathrow is not happy Heathrow came under a lot of criticism after the fire - including the revelation that the chief executive Thomas Woldbye was asleep in bed when the decision was taken to close the airport. NESO said its report was not written to "apportion blame", but Heathrow says it is now considering legal action against National Grid. In its view the report described "clear and repeated failings" which "could and should" have prevented the fire. It said it expected National Grid to "take responsibility for those failings." National Grid said it had a comprehensive maintenance programme, and would co-operate closely with the Ofgem investigation.
