Sizewell C nuclear power plant

Details of proposals for Sizewell C, another nuclear power plant in Suffolk.

In November 2009 the government announced that Sizewell, amongst other sites, would be a suitable location for a new nuclear power station.

EDF Energy is bringing forward an application to construct and operate Sizewell C. Details of the proposals are available on EDF Energy’s Sizewell C pages.

In 2011 the National Policy Statements for Energy Infrastructure were approved. These contain the policies by which applications for major energy projects are judged, and as such, are relevant to the Sizewell proposals.

The Planning Inspectorate will determine the application, not the local councils.

However Suffolk County Council and East Suffolk Council are statutory consultees and will evaluate, challenge and comment upon the proposals for a new nuclear power station to get the best possible outcomes for the people of Suffolk.

The key milestones in the planning phase of the proposed new power station



Stage One consultation: EDF Energy set out the background and context to the development

Completed on 6 February 2013

Stage Two consultation: a second formal stage of consultation

From 23 November 2016 to 3 February 2017

Stage Three consultation: a third stage of formal consultation

From 4 January 2019 to 29 March 2019

Stage Four consultation: a fourth stage of formal consultation, supplementary to the stage three consultation, focusing on specific issues

From 18 July 2019 to 27 September 2019

Submission of Development Consent Order (DCO) to the Planning Inspectorate

27 May 2020

Section 56 consultation (invitation to register as an Interest Party and submit Relevant Representations to the Planning Inspectorate)

From 8 July to 30 September 2020

Examination of the DCO by an Examining Authority appointed by the Planning Inspectorate

15 April to 14 October 2021

Decision by the Secretary of State (SoS)

Within 6 months after the end of the Examination

Suffolk County Council and East Suffolk Council are working together to respond to EDF Energy’s proposals. Further information about the two councils’ work on Sizewell C including their formal joint responses to the Sizewell C consultations are available on the joint local authority page on

All documents submitted by the Applicant and all Interested Parties (including Suffolk County Council) are published on the Planning Inspectorate website.

Local Impact Report

Suffolk County Council and East Suffolk Council submitted on 12 May 2021 their joint Local Impact Report to the Planning Inspectorate.

The Local Impact Report sets out the Councils’ assessment of the likely impacts of the proposed development, and considers whether the proposed mitigation is appropriate or additional mitigation is required.

The submission to the Planning Inspectorate includes also a significant number of Annexes and Appendices, which are being published on the Planning Inspectorate website.

Read the Joint Suffolk Local Impact report (PDF, 3.6MB).

Suffolk County Council’s Relevant Representation

The Council submitted its Relevant Representation to the Planning Inspectorate on 28 September 2020, following a debate and decision at a meeting of the Council’s Cabinet on 22 September 2020.

The Relevant Representation provides a summary of the Council’s views on the proposals put forward in the Development Consent Order (DCO) application and identifies the key topics and issues have the Council wishes to see addressed during the examination stage.

Read Suffolk Council Council’s Relevant Representation (PDF, 513KB).

Suffolk County Council’s response to Sizewell C consultation on proposed changes

In November/December 2020, EDF Energy held a 30-day consultation regarding some amendments to its Sizewell C DCO application, with a particular focus on proposals to move more freight to marine and rail-based transport modes.

Read Suffolk County Council’s response to the EDF Energy consultation on proposed changes (PDF, 509KB).

Review of Sizewell C Bat Impact Assessment

Suffolk County Council and East Suffolk Council, working closely with the Suffolk Wildlife Trust, commissioned an independent review of the bat impact assessment.

This review will inform the Councils’ discussions with EDF Energy, in order to improve the Sizewell C proposals for mitigation to ensure they will not have a significant adverse effect on bats.

Read the:

Sizewell C Power Export Connection review

In light of Suffolk County Council’s concerns about the proposed introduction of four additional pylons and overhead lines as part of the Sizewell C proposals, and the resulting impacts on the Suffolk Coast and Heath Area of Natural Beauty (AONB), the County Council commissioned a high level independent report into the feasibility of alternative export connections avoiding pylons, to feed into the County Council’s responses to the Planning Inspectorate.

Read Sizewell C Power Export Connection review (PDF, 271KB)

Review of EDF Energy’s rail proposals for the Sizewell C development

Suffolk County Council commissioned an independent report into possible options to increase deliveries of materials by rail in response to the proposals put forward by EDF Energy in its Development Consent Order application, to feed into the County Council’s responses to the Planning Inspectorate.

Read the:

Accommodation Campus report

Following the EDF Energy Stage Two public consultation and Suffolk County Council's ask that EDF review potential alternative sites for the Accommodation Campus, the County Council commissioned an independent report as our contribution to this review.

Read the Accommodation Campus report (PDF, 4.5MB).

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