Thames Estuary 2100 Plan

Location: Thames Estuary                                                                        Client: Environment Agency


We were commissioned to undertake the ten-year review of the economic case for the Thames Estuary 2100 Plan, the plan to manage tidal flood risk within and across the Thames Estuary. As part of this process, the client saw an opportunity to review how the principles of natural capital could be integrated into future updates to the economic case for the plan.


A bespoke natural capital accounting framework was developed in line with the most up-to-date guidance and evidence available, which would allow the client to determine the net change in ecosystem services benefits delivered resulting from the scheme in economic terms. The framework built upon our previous baseline natural capital assessment of the Tidal Thames delivered for the Ministry for Housing, Communities and Local Government, as well as the EA’s Natural Capital Register and Account Tool (NCRAT), providing an opportunity to trial the application of this tool at a regional scale.


The framework delivered a clear and accessible approach for determining robust values for the monetisation of environmental externalities associated with the scheme for application within the economic appraisal process. As part of the framework, a systematic review and testing of the NCRAT delivered new insights for further development of the tool. Throughout the process, we were also able to deliver guidance and recommendations for how the client might integrate the principles of natural capital, SEA and BNG to deliver upon their wider, sustainability commitments more efficiently moving forwards.

Want to know more?

For more information about this project please email Rachelle Ngai or Oliver Seville.

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