Our proposals

Our proposals include the construction and operation of approximately 183km of the transmission network between existing substations in Norwich, Bamford, and Tilbury, and a new 400kV substation in Tendring, to connect to new offshore wind generation.

Our current proposals comprise mostly of overhead line and pylons, along with some underground cables from Flowton to Bramford substation, from the Capel St Mary area through the Dedham Vale Area of Outstanding Natural Beauty (AONB) and continuing to the proposed new substation near Lawford, and in the Great Horkesley and Fairstead areas.  

Cable Sealing End (CSE) compounds would be required to connect sections of underground cable with the overhead lines. Each CSE compound would be fenced and would contain electrical equipment, support structures, a small control building and a permanent access track.

We are proposing the new substation site to be located in Tendring District, known as the East Anglia Connection Node (EACN). It would connect clean energy from offshore wind generation so it can be transported to homes and businesses. It would be fenced and would include a permanent access road and parking areas. It would contain high-voltage electrical equipment, such as transformers, circuit breakers and shunt reactors, support structures and control buildings.   

Work would be required at the existing 400kV substations at Norwich, Bramford and Tilbury.

How our proposals have evolved

Since our 2022 consultation we have:

  • undertaken further technical work and carefully considered the consultation feedback
  • developed a preferred draft alignment, which shows potential positions for pylons, overhead lines, underground cables and cable sealing end compounds
  • developed our proposed preferred site for the new substation at Lawford.

As a result of consultation feedback and further assessments we have made the following changes to our proposals:

  • Diverting to the East of Wortham Ling before re-joining the preferred corridor to the south-west of Diss
  • Diverting to the east, south of Offton, then paralleling the existing 132kV overhead line route to the north and east of Flowton to Bramford substation, referred to as North of Flowton
  • Added an alternative route to the north and east of Notley Enterprise Park and at the northern edge of the Dedham Vale AONB, referred to as West of Great Wenham 
  • Straightened the draft alignment slightly West of Writtle
  • Added an alternative route Further east of Ingatestone

There are also areas where the preferred draft alignment would be routed within an area thought less likely within the 2022 draft corridor, as was shown by the graduated swathe.

The proposed draft alignment is shown for each district council area, with a summary of what has changed both inside and outside the preferred draft corridor that we shared at our consultation in 2022. 

More information on the changes and how we have progressed the project design since the 2022 non-statutory consultation is available in the Design Development Report 2023.