We propose to build and operate three new substations – one in Chesterfield, another near Brinsworth and a third in High Marnham – to allow us to safely carry more energy between the North of England and the Midlands.

The proposed substations would also enable us to upgrade the existing Brinsworth to Chesterfield and Chesterfield to High Marnham overhead lines in the region and connect future electricity transmission network projects as part of The Great Grid Upgrade

The Brinsworth to High Marnham project includes upgrading the existing overhead lines and building the three proposed new substations.



We propose to build and operate a new 400 kV substation which will extend to the south of our existing site off Calow Lane in Cock Alley, near Chesterfield in Derbyshire. We’d remove some of the existing equipment and replace it with new infrastructure.

We expect it will be a gas insulated switchgear (GIS) substation as it’s more compact than AIS and there’s limited space at the site. Most of the equipment would be housed within a single building.

The new substation would be within a compound of approximately 150 metres x 165 metres—the size of around 3.5 football pitches—and include supergrid transformers, which increase or decrease the voltage of electricity between different circuits. It would also include approximately 16 bays, network stability equipment, standard substation plant, and control infrastructure.

The GIS building would be the highest structure within the substation compound, at approximately 14 metres. We also propose six overhead line gantries, which are bridge-like structures with platforms to support equipment and cabling. The footprint of the site has the potential for some future expansion, if required.

Chesterfield substation


Chesterfield sign-gate

We also propose a temporary diversion of the Chesterfield to High Marnham overhead electricity line, with temporary pylons during construction. We expect these temporary diversions will be in place for around two years. We’ll include details when we submit our planning application.

The existing substation site currently includes three pylons. Once we’ve built the new 400 kV substation, we’ll remove two pylons and replace them with another two to the south and south west of the site. One of the pylons will remain. 


Learn more 

Submit your feedback

We value your input as we develop our plans – feedback from local communities and stakeholders will play an important part and help shape our plans ahead of the planning applications.

To provide feedback on our Chesterfield proposals you can: 

  • Complete an online feedback form

  • Email your comments to: [email protected]

  • Call us on freephone 0800 073 1047 between 9am and 5.30pm

  • Post your written responses or printed feedback form to: FREEPOST National Grid Projects (JBP) (no stamp or additional address information required)

If you’d like help submitting your feedback or require a feedback form in another format, please contact our Community Relations Team.

We must receive your comments by 11.59pm on Monday 20 May 2024.

Consultation events

Join us at one of our consultation events to find out more about our proposals – members of the project team will be available to answer questions:

Chesterfield face-to face events:






Calow Community Centre, Allpits Road, Chesterfield, S44 5AT

Friday 10 May 2024

Saturday 11 May 2024

2 – 7pm

9am – 2pm

Chesterfield online webinar: 

Webinar session



Chesterfield   proposals

Wednesday 1 May 2024

6- 7pm 


Register for the webinar here or call our Community Relations Team on 0800 073 1047 or email [email protected] to book

National Grid partners with Met Office to boost capacity on the electricity transmission network - electricity transmission pylon and overhead lines at dusk

Get in touch

Do you have questions about the project? Or would you like to register your interest for us to keep in touch? Contact our Community Relations Team:

Email:[email protected]

Freephone:0800 073 1047 Monday to Friday 9am-5:30pm (An answering service is in place outside of these times)

Write to us: FREEPOST National Grid Projects (JBP) (no stamp or additional address information required)

You can also register your details to receive email updates on the project.

Register your email  

If you think our proposals could affect your land, please contact the Brinsworth to High Marnham Land Referencing Team at Ardent. You can call 0203 693 2500 or email [email protected]. Alternatively, you can write to Ardent, 36-38 Botolph Lane, London, EC3R 8DE.