Document library

Our first stage of consultation finished in June 2022, but you can continue to view our consultation documents and materials below. These include the Corridor and preferred routeing and siting study (CPRSS) report, which contains detailed information on the work we have done and presented at our Spring 2022 consultation and the Project Background Document, which provides this information in a more accessible format. 

Description of consultation documents



Project Background Document

Providing an overview of the project and detailing our proposals and how we are consulting.

Corridor and preliminary routeing and substation siting report

Providing more technical information on the project and the need for the project, the options considered, the routing and siting options assessed and our preferred options.

Overview map and individual route section maps

Showing the location of the preferred route and the graduated swathe.


Summarising details of the project and public consultation.

Feedback form

To gather comments and feedback.


Hosting all project information, including downloadable versions of all the above documents, FAQs, an online feedback form and interactive map.


Interactive map

We produced an interactive map to support our public consultation in spring 2022 to make it easier to identify where you are in relation to our proposals. This interactive map will be updated as we develop our proposals further.

View the interactive map of our proposals 

Using this interactive map, you can:

View our proposed graduated swathe detailing a new 400kV overhead line between the existing Norwich Main substation in Norfolk to the existing substation at Bramford, and from Bramford to the existing Tilbury substation in Essex.

View the graduated swathe detailing our proposals for a connection substation on the Tendring Peninsula. This is detailed in the 'Our proposals in Babergh, Tendring and Colchester' section of our project background document.

The key on the upper left-hand side of the interactive map provides you with the functionality to toggle between both our proposed new 400kV overhead line and the connection substation.

As our proposals relate to the reinforcement of the 400kV network in East Anglia, this map only illustrates the existing 400kV network along with related substations. A detailed map of the existing 275kV and 132kV network, particularly in and around London, can be viewed on page 25 of our project background document.