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Frequently Asked Questions

Latest News

Latest News

20/03/2026

Current Works:

Cladding of the main building is ongoing.

Internal concrete floors within the main building have been poured with some final internal walls remaining.

The 400kV bay extension is progressing well.

The main connection cable has been completed between the Synchronous Condenser facility and the National Grid substation.

Site drainage works (below ground) are ongoing and are being completed around the other activities due to sequencing requirements.

 

Looking Ahead (within the next month):

Abnormal Indivisible Load (AIL) movements commenced in March 2026. The specialist transporter has circulated further information to affected residents and businesses in advance of any movements.

The Synchronous Condenser building doors will be installed in the coming weeks and the foundations for the smaller electrical transformer housing will be excavated and poured.

Work on the erection of structures associated with the high voltage switchyard will commence.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed throughout the winter months and the wheel wash facility will be reviewed and used if/when needed.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation. The lorry movements are irregular. We continue to work closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

03/03/2026
Upcoming AIL movements:

Please see statement from Allelys Heavy Haulage regarding upcoming abnormal load movements that will result in layby closures and parking restrictions.




20/02/2026​:

Current Works:

Cladding of the main building is nearing completion. Internal concrete floors within the main building are ongoing, with the last few sections ready to be poured.

The Generator Circuit Breakers are currently being installed and the 400kV bay extension is progressing well.

The main connection cable has been installed between the Synchronous Condenser facility and the National Grid substation and this will be connected shortly.

Site drainage works (below ground) are ongoing and are being completed around the other activities due to sequencing requirements.

 

Looking Ahead (within the next month):

Abnormal Indivisible Load (AIL) movements are due to commence in March 2026. The specialist transporter will be circulating further information to affected residents and businesses in advance of any movements.

The Synchronous Condenser building doors will be installed in the coming weeks and the foundations for the smaller electrical transformer housing will be excavated and poured.

Grid step-up transformers will be delivered and installed.

Work on the erection of structures associated with the high voltage switchyard will commence.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed throughout the winter months and the wheel wash facility will be reviewed and used if/when needed.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation. The lorry movements are irregular. We continue to work closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

20/01/2026:

Current Works:

Cladding of the main building is ongoing, which has now shifted to wall cladding following completion of the roofs. Internal concrete floors within the main building are currently being poured.

 

Looking Ahead (within the next month):

Abnormal Indivisible Load (AIL) movements are due to commence in February 2026.

Grid step-up transformers and generator circuit breakers will also be delivered and installed.

Work on the erection of structures associated with the high voltage switchyard will commence.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed throughout the winter months and the wheel wash facility will be reviewed and used if/when needed.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation. The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.
 

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

05/01/2026:

Looking Ahead:

The foundations for the High Voltage Switch Yard, the Synchronous Condenser and the Transformer bay are now complete. Preparations are underway for the installation of the Transformer in the new year.

The main building steelwork is complete and cladding is complete to the roofline. Work has started on cladding the building walls and this will continue into the new year.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed throughout the winter months and the wheel wash facility will be reviewed and used if/when needed.

 

Deliveries:

The Civils contractor is receiving ongoing deliveries for the building cladding and structural steelwork for the High Voltage switchyard.

The delivery of the first Transformer is due at the end of January/early February 2026.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation. The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.
 

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

25/11/2025:

Looking Ahead:

Foundations for the High Voltage Switchyard and the transformer bay are now complete, with preparations underway for receiving and installing the Transformers in December.

Work continues on the Synchronous Condenser foundations.

The building steelwork is completed and cladding installation has started. This will continue for the next 4 weeks.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed. Being in Autumn and with winter approaching the

wheel wash facility will be reviewed and used as and when needed.

 

Deliveries:

In addition to miscellaneous deliveries for the civils works, with construction work progressing well on the main building, cladding deliveries are scheduled to be received by the site w/c 24 November.

The Transformers are scheduled to be received by the site in the 1st and 2nd weeks of December (subject to final programming).

The delivery of structural steelwork for the High Voltage Switchyard is also due in the 2nd week of December.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation.

The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

​​

30/09/2025:

 

 

 

 

 

 

 

 

 

 

 

Looking Ahead:

Work is progressing well on the foundations across the site. The main building foundation pads are now complete and the building steelwork is being erected. After this the cladding will be installed, in readiness for receiving the synchronous condenser plant deliveries.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed. Being in Autumn and with winter approaching the wheel wash facility will be reviewed and used as and when needed.

 

Deliveries:

The site is receiving frequent steelwork deliveries for the main building frame, which is currently under construction. After this the building cladding will be delivered to the site, with subsequent deliveries focused on smaller equipment.

The first Abnormal Load (the transformer) is scheduled for delivery in November.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation. The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

29/08/2025

Looking Ahead:

Work continues on the foundations across the site in preparation for the start of the main building construction.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed. During warm weather dust will be dampened down.

 

Deliveries:

Deliveries are currently less frequent to the site but will increase towards the end of the year to meet the equipment and machinery delivery and installation programmes.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation. The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

07/08/2025

Looking ahead:

Foundation installation continues across the site. The main areas of focus are:

  1. Within the High Voltage Yard;

  2. The Synchronous Condenser plant foundations;

  3. The transformer bays; and

  4. Foundation pads for the main plant building.
     

Excavation and concrete blinding works associated with the trough runs are ongoing.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed. Dust during warm weather will be dampened down.

 

Deliveries:

Deliveries to site will start to increase as we get further into the foundation construction stage and prepare for the equipment/machinery installation.

 

National Grid Substation:

National Grid is continuing their work within the Cilfynydd Substation.

The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:  

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

07/07/2025

Looking ahead:

Foundation works continue across the site for the HV Yard, the Synchronous Condenser, transformer bays and the foundation pads for the main building. Drainage works and haul road construction are also ongoing.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed. Dust during warm weather will be dampened down

 

Deliveries:

Deliveries to site will start to increase as construction works prepare for the equipment/ machinery installation.

 

National Grid Substation:

National Grid is continuing their work within the adjacent Cilfynydd Substation.

The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

11/06/2025

Looking ahead:

Work continues on installing the drainage system, the trough runs and foundations across the site, with the main building, High Voltage Switchyard and Transformer foundation excavations, blindings and pours due to start soon and continue over the summer.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed. During warm weather dust will be dampened down.

 

National Grid:

National Grid is continuing their work within the Cilfynydd Substation.

The lorry movements are irregular. We are still working closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

Contact Us:

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

15/05/2025

Looking ahead:

Over the next 4 weeks the following works will be progressed on site:

  • The installation of Earthing tape;

  • Continuing the drainage works including the filter drains and attenuation pond;

  • Ongoing construction of the Haul Road; and,

  • Starting concrete pours for the synchronous condenser foundations and the step-up transformer bays.

 

Road Cleaning:

The jet wash facility will remain on the construction site for the duration of the works as well as the Telehandler brush attachment. A road sweeper is also on standby to clean the public road as and when needed.

 

National Grid:

National Grid is continuing its construction work within the Cilfynydd Substation. The lorry movements are not as regular now; however, we continue to work closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

14/04/2025

Looking ahead:

 

Excavation of the synchronous condenser foundations and earthworks for the wider site will continue over the coming weeks. Installation of the sustainable surface water drainage system will start, including the filter drainage and surface water carrier system, creating the attenuation pond base and installing the pond lining.

 

Road Cleaning:

The jet wash facility and telehandler brush attachment will remain on the construction site for the duration of the works.

A road sweeper is also on standby to clean the public road as and when needed.

 

National Grid:

National Grid is continuing its construction work within the Cilfynydd Substation. The lorry movements are not as regular now; however, we continue to work closely with National Grid to ensure that disruption is kept to a minimum and we have regular calls to discuss traffic management.

 

Contact Us:

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk


19/03/2025

Looking ahead:

 

Excavation for the water management and drainage works has started and will continue over the coming weeks. The disused brickwork tank will also be removed. Unsuitable material will be temporarily stored on the Fairview field before it is removed.

 

Structural steelwork is being procured and will start to be delivered to the site in April.

 

Road Cleaning:

 

The wheel cleaning facility will remain on the construction site for the duration of the works. A road sweeper is also on standby to clean the public road as and when needed.

 

National Grid:

 

National Grid has started their work within the Cilfynydd Substation, which is generating regular lorry movements. We are working with National Grid to ensure that disruption is kept to a minimum and have regular calls to discuss traffic management.

 

Contact Us:

 

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk


19/02/2025

Looking ahead:

 

Over the next 4 weeks excavation on the development site will continue, though movements of soil from the site to the temporary construction compound will be less frequent. The temporary welfare and office cabins in the construction compound will be removed at the end of February and steelwork will be delivered to the site in mid-March.

 

Road Cleaning:

 

The wheel cleaning facility will remain on the construction site for the duration of the works. A road sweeper is also on standby to clean the public road as and when needed.

 

Contact Us:

 

Should you have any questions or concerns regarding the Cilfynydd Grid Services construction works please e-mail the Project Team: info@cilfynyddgridservices.co.uk

13/01/2025

Dŵr Cymru Welsh Water has completed the water main diversion and reinstatement works in National Road.

​The synchronous condenser temporary construction compound has been set up in the ‘Fairview Field’, with the access, hardstanding areas and interim welfare facilities installed through November into December 2024. A perimeter fence has also been installed for safety and security purposes.

On the main development site, the initial topsoil strip has taken place and construction of the main access into the site has started. A perimeter fence has also been installed. Over the next two weeks site set-up preparations will continue, with the main earthworks scheduled to start w/c 27 January 2025.

​October 2024
Meet the Contractor Events

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