Abstract
This Evidence Review Note (ERN) provides comprehensive guidance on assessing the impacts of offshore windfarm (OWF) projects on shipping and navigation in the UK. Drawing on evidence from 76 Environmental Impact Assessments (EIAs), along with input from regulators and shipping and navigation professionals, the ERN aims to support more effective, proportionate, and consistent EIAs.
This ERN does not propose any changes to Navigational Risk Assessment (NRA) methodology and refers to the standard good practice and policy that is currently used. The NRA provides a detailed technical assessment of navigational hazards and risks, e.g. including calculations of collision probabilities, while the EIA summarises these findings and presents them in line with the requirements of the EIA regulations.
Several challenges have been identified in this latter component, i.e. the translation of the NRA into EIA reporting on shipping and navigation impacts. EIA scoping, reporting structures and terminology varies widely across projects, making it difficult to compare findings and increasing the complexity of assessments. Environmental Statements (ES) and EIA reports are often overly detailed and lengthy, which can obscure key conclusions and reduce their accessibility for stakeholders. There is an increasing need to better assess and screen for potential cumulative impacts and strategic-level considerations to identify any potential unacceptable risks earlier, prior to embarking on detailed EIA.
The analysis highlights the importance of mitigation measures in reducing adverse effects on shipping and navigation. Well-designed interventions are proven to be highly effective, usually bringing predicted impacts below significance thresholds in EIA and into tolerable thresholds for NRA. Better integration of digital tools such as GIS, interactive maps and dynamic reporting platforms present a transformative opportunity to enhance the clarity and accessibility of EIA outputs.
To address these issues, the ERN gives recommendations in six key areas in relation to shipping and navigation EIA:
- Standardisation of Scoping: Standardise scoping practices across the UK, to prioritise significant impacts while minimising unnecessary assessments.
- Consistency and Clarity of Reporting: Use standardised chapter structures, consistent terminology, and streamlined reporting formats. This will improve accessibility for all stakeholders, from technical specialists to the general public.
- Proportionality of Reporting: Focus on significant impacts and use technical appendices for detailed data, avoiding unnecessary duplication of NRA content, and ensuring concise ES, supported by digital tools. Use integrated digital platforms to enable improved reporting with interactive, user-friendly outputs through GIS-based mapping, dynamic visualisations, and the potential for enhanced monitoring reporting.
- Monitoring and Enforcement: Carry out robust management and monitoring of frameworks to ensure the implementation of controls, monitor the effectiveness of mitigation measures and enforce non-compliance.
- Strategic Approach to Risk Assessment: Create greater alignment between project-level assessments and wider strategic objectives, including cumulative effects across multiple OWF projects. This will improve efficiency and provide better context for decision-making.
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Use of Cumulative Effects Assessment (CEA): Adopt a consistent approach to assessing CEA for shipping and navigation. Identify any cumulative adverse effects, across regions or areas of sea where offshore wind is deployed, that need to be taken into account for future projects.
By implementing these recommendations, the offshore wind sector can reduce costs, increase certainty and streamline the consenting process. Clearer and more accessible reporting will foster trust and engagement among stakeholders. A consensus-led and evidence-based approach will balance the need for renewable energy development while safeguarding the needs of shipping and navigation.