We propose a series of works to build and operate three new substations – one near Brinsworth, another near Chesterfield 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 electricity lines and connect future electricity transmission network projects as part of The Great Grid Upgrade.
 

High Marnham

We propose to build and operate a new 400 kV substation to the west of our existing site in High Marnham, near Normanton on Trent in Nottinghamshire. We'd remove some of the existing equipment and replace it with new infrastructure.

The new substation would be within a compound approximately 690 metres x 200 metres, the size of around 13 football pitches, and includes two supergrid transformers, which are used to increase or decrease the voltage of electricity between different circuits. The substation would include 16 bays, as well as network stability equipment and control infrastructure.

The highest structures within the substation compound would be the 10 overhead line gantries, which are bridge-like structures with platforms used to support equipment and cabling, at approximately 12 metres high.

We also propose a temporary diversion of the existing overhead electricity lines with temporary pylons during construction.