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.

Chesterfield

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.
 

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 

• Read our Project Summary Document

• View our event materials

• Listen to our webinar

• Call us on freephone 0800 073 1047 between 9am and 5:30pm

• Email [email protected] 
  

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