Swansea Bay Tidal Lagoon

Swansea Bay Tidal Lagoon
Name	Swansea Bay Tidal Lagoon
Location	Swansea Bay, Swansea, Wales
Status	Proposed
Cost	£1.3–£1.4 billion (est.)
Capacity	320 MW (proposed)
Developer	Tidal Lagoon Power
Type	Tidal lagoon power plant

Swansea Bay Tidal Lagoon The Swansea Bay Tidal Lagoon was a proposed tidal power project intended for Swansea Bay in Swansea, Wales, developed by Tidal Lagoon Power with wide engagement across United Kingdom policymaking, engineering, environmental science and finance sectors. The proposal attracted attention from institutions such as Department for Business, Energy and Industrial Strategy, UK Treasury, National Grid ESO and research bodies including Cardiff University, Queen's University Belfast and Bangor University. Debates involved stakeholders like Welsh Government, UK Government, Royal Society, Energy Technologies Institute and NGOs such as Greenpeace, Friends of the Earth and WWF-UK.

Overview

The project envisioned a tidal lagoon in Swansea Bay providing predictable renewable electricity by capturing tidal range through turbines, comparable in concept to installations like La Rance Tidal Power Station and proposals across Severn Estuary schemes, and was part of broader UK renewable energy discussions alongside Hinkley Point C, Beatrice Offshore Wind Farm, Dogger Bank Wind Farm and other low-carbon initiatives. Proponents cited benefits similar to those discussed in UK Carbon Plan and HM Treasury appraisals, while critics invoked fiscal scrutiny from institutions including National Audit Office and legal frameworks such as the Electricity Act 1989 and Planning Act 2008.

Design and Engineering

Designs proposed a crescent-shaped embankment with sluice gates, low-head bi-directional turbines, concrete caissons and rock-armour revetments reflecting engineering experience from La Rance, Sihwa Lake Tidal Power Station and coastal projects managed by firms like Atkins, Arup, Balfour Beatty, Mott MacDonald and Royal HaskoningDHV. The design team referenced modelling methods used by University of Southampton, Imperial College London and University of Plymouth to simulate hydrodynamics, sediment transport and flood risk, integrating telemetry systems akin to National Grid ESO operational control. Materials procurement and marine construction sequencing drew on precedents from Thames Barrier, Forth Road Bridge maintenance and port projects at Port Talbot and Swansea Docks.

Environmental Impact and Research

Environmental assessments engaged specialists from Natural Resources Wales, Environment Agency, Centre for Ecology & Hydrology, and academic researchers at Cardiff University, University of Bristol and Plymouth Marine Laboratory. Key topics included effects on tidal range, intertidal habitats, Burry Inlet bird populations monitored under conventions like the Ramsar Convention and East Atlantic Flyway, fish migration concerns paralleling studies at La Rance and Sihwa Lake, and sediment dynamics comparable to research at Wash Estuary and Severn Estuary. Monitoring proposals referenced frameworks used by Joint Nature Conservation Committee and mitigation measures akin to adaptive management applied in Thames Estuary 2100 planning and Marine Management Organisation licensing.

Economic and Policy Considerations

Economic modelling involved entities such as KPMG, PwC, Oxford Economics and drew comparisons with contracts for difference awarded to projects like Hinkley Point C and Hornsea Project. Public value analyses were debated between UK Treasury, Department for Business, Energy and Industrial Strategy and independent reviewers including National Audit Office and Institute for Fiscal Studies. Policy discussions referenced UK commitments under Climate Change Act 2008, carbon budgets overseen by the Committee on Climate Change, and integration into networks managed by National Grid ESO and market arrangements in Ofgem regulation. Financing strategies considered involvement from entities like UK Green Investment Bank, European Investment Bank, Infrastructure UK and pension funds akin to Legal & General and Aviva Investors.

Planning, Approvals and Political Debate

The proposal underwent public consultation processes engaging Swansea Council, Neath Port Talbot Borough Council, local MPs including representatives from Welsh Labour, Plaid Cymru, Conservative Party (UK), and advocacy from groups such as Swansea Tidal Lagoon Group. National political debate involved Prime Minister of the United Kingdom, chancellors including references to Philip Hammond and successors, ministers in Welsh Government like First Minister of Wales and scrutiny from parliamentary committees including the Select Committee on Energy Security. Opposition addressed value-for-money concerns raised by National Audit Office reports and media coverage in outlets like BBC News, The Guardian, Financial Times and The Telegraph.

Construction, Operation and Decommissioning Plans

Construction plans described phased marine works, turbine installation, cofferdams and commissioning schedules informed by projects like Sihwa Lake retrofit, with workforce and skills development linked to Swansea University training programmes and trade unions such as Unite the Union and GMB Union. Operational plans outlined predictable generation profiles over a projected 120-year asset life, maintenance access inspired by La Rance practices and grid connection arrangements with National Grid ESO and regional distribution networks operated by companies like Western Power Distribution. Decommissioning scenarios followed guidance from Marine Management Organisation and international best practice exemplified by ITER site planning and lifecycle analyses used by International Renewable Energy Agency and IEA modelling.

Category:Tidal power stations in the United Kingdom