Incidents

3:30pm, 22nd March 2025

National Grid response to National Energy System Operator investigation into power loss impacting Heathrow 

We welcome this investigation into yesterday’s events and will work closely with all parties involved to understand the cause of the incident

6am, 22nd March 2025

Power supplies have been restored to all customers connected to our North Hyde substation, including Heathrow, allowing operations to resume at the airport. We are now implementing measures to help further improve the resilience levels of our network.

We are deeply sorry for the disruption caused and are continuing to work closely with the Government, Heathrow and the police to understand the cause of the incident.

2pm, 21st March 2025

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. 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.  

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.

7am, 21st March 2025

A fire at our North Hyde substation in West London has damaged equipment, leading to a loss of power supply in the area. We are working at speed to restore power supplies as quickly as possible.

We are working alongside the DNO for the area, SSEN, to reconnect affected domestic customers. As of 0600, power has been restored to 62,000 customers, with 4,900 currently without power. Restoration efforts will continue this morning and further updates will be provided.

5.30am, 21st March 2025

A fire at North Hyde substation in West London has damaged equipment, leading to a loss of power supply in the area. We are working at speed to restore power supplies as quickly as possible and will provide an update as soon as we can.