South West of England Regional Development Agency Wave Hub Technical Feasibility Study Final Report
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South West of England Regional Development Agency Wave Hub Technical Feasibility Study Final Report January 2005 Halcrow Group Limited In association with: Abbott Risk Consulting Global Marine Systems Ltd South West of England Regional Development Agency Wave Hub Technical Feasibility Study Final Report January 2005 Halcrow Group Limited In association with: Abbott Risk Consulting Global Marine Systems Ltd Halcrow Group Limited Ambassador House, Ambassador Drive, Exeter, Devon EX1 3QN Tel +44 (0)1392 444252 Fax +44 (0)1392 444301 www.halcrow.com Halcrow Group Limited has prepared this report in accordance with the instructions of their client, South West Regional Development Agency, for their sole and specific use. Any other persons who use any information contained herein do so at their own risk. © Halcrow Group Limited 2005 Halcrow Group Limited Ambassador House, Ambassador Drive, Exeter, Devon EX1 3QN Tel +44 (0)1392 444252 Fax +44 (0)1392 444301 www.halcrow.com South West of England Regional Development Agency Wave Hub Technical Feasibility Study Final Report Contents Amendment Record This report has been issued and amended as follows: Issue Revision Description Date Signed 1 0 First Draft for team review 12/04 PS 2 0 Second draft with comments 12/04 PS 3 0 Final 01/05 PS 4 0 Final 01/05 PS Contents Executive summary i 1 Introduction 1 1.1 Project background 1 1.2 Project team 3 1.3 W ave energy potential in the South W est of England 5 1.4 W ave Hub concept and its development 7 1.5 Methodology 8 2 Wave energy Developers 11 2.1 Developer requirements 11 2.2 Status of Developer readiness 16 2.3 Conclusions on Developer responses 16 3 Wave Hub design choices 18 3.1 W ave Hub design choices and stage one sifting 18 3.2 Stage two evaluation 18 3.3 Developing the four preferred options and third stage evaluation 20 3.4 Discarding of Options 1 and 3 24 3.5 Concept development 24 3.6 Conclusions 27 4 Site identification 29 4.1 Introduction 29 4.2 Screening of potential sites 29 4.3 Site identification: onshore 30 4.4 Site identification: offshore 32 4.5 Cable route and risk study 36 4.6 Environmental scoping study 40 5 Wave Hub technical specification 45 5.1 Introduction 45 5.2 Offshore equipment - wet hub 45 5.3 Electrical connection from wet hub to shore 47 5.4 W et hub system expansion 47 5.5 Onshore equipment 47 5.6 Specification for Developers 49 6 Operation and maintenance 51 6.1 Organisation and responsibilities 51 6.2 Operating requirements 52 6.3 Maintenance requirements 54 6.4 Training 56 6.5 Quality, health, safety and environmental management 56 6.6 Community liaison 57 7 Power generation potential 58 7.1 Introduction 58 7.2 Methodology 58 7.3 Results 59 7.4 Conclusions 61 8 Technical financial analysis 62 8.1 Introduction 62 8.2 Development and procurement costs 62 8.3 Construction costs 64 8.4 Costs of alternative W ave Hub arrangement 65 8.5 Phasing/modularity 65 8.6 Connection costs 66 8.7 O& M costs 66 8.8 Cost : risk and sensitivity analysis 68 9 Proposed development programme 70 9.1 Development schedule 70 9.2 Construction schedule 71 9.3 Environment impacts on construction schedule 72 9.4 Conclusion 73 10 Conclusions 75 10.1 Aims of the study 75 10.2 Need for the project 75 10.3 Conceptual and outline design 77 10.4 Location and impact 77 10.5 Cost and timing 78 Glossary Appendices Appendix A - List of associated TFS reports Appendix B - Consultee list Appendix C - Project outline drawings, Nos. 001-004 Appendix D - Capital cost breakdown Executive summary The Wave Hub is an exciting opportunity to help ensure the UK continues to lead the development of Wave Energy. In simple terms, it consists of an offshore electrical “socket” connecting Wave Energy Converters (WECs) to the national grid. It will also provide a suitable offshore wave energy site fully monitored for the wave resource and with a simplified route to permitting and consenting. The mission of Wave Hub is to: • demonstrate the commercial viability of wave energy by supporting wave energy developers across the funding gap between the R&D stage and supported commercial development, complementing existing UK initiatives such as EMEC, NaREC and the Carbon Trust Marine Energy Challenge. A need for this facility has been established by the emerging wave energy industry to enable WEC developers to bridge the so called 'valley of death' between production prototypes and full commercial wave farms. • be an 'infrastructure plus' project for the South West supporting the emerging marine energy sector and make Cornwall and the South West of England the destination of choice for WEC developers to conduct commercial-scale developments. • build on the work already carried out by NaREC, EMEC, Carbon Trust and the DTI to establish the UK as the world leader in marine energy. Help to develop the emerging UK renewable energy sector, increasing GDP and creating a significant numbers of jobs. • contribute to the South West renewable energy targets in line with the South West Renewable Energy Strategy. In doing so, there will be a variety of direct and indirect benefits to the region and the industry: • The production of a significant amount of clean renewable energy in the South West region to help meet regional and national targets • Promotion of the South West region as a leader in the field of wave energy electricity generation • The creation of new jobs and skills in wave energy project development and operation • The creation of new industry and expansion of existing marine and engineering industries capable of manufacturing, deploying, maintaining, inspecting, repairing and decommissioning the potentially wide range of WEC types likely to be deployed • The enhancement of the academic capability and knowledge base in the South West and the provision of a resource in support of local education and training in renewable energy technologies • Provision for WEC developers to install demonstration size projects and plug the gap identified in a number of studies between test machines and large scale commercial projects comprising of arrays of WEC’s WGEHUB1214R – Wave Hub Technical Feasibility Study – Final Report (Task 11) – January 2005 i • Prove the wave energy concept to the satisfaction of potential project lenders to enable future financing of commercial projects The project fits closely in with both the South West Regional Economic Strategy and the South West Renewable Energy Strategy – it will grow a new industry and develop areas of excellence. SWRDA appointed Halcrow in June 2004 to assess the technical feasibility of this initiative and to: • develop the Wave Hub concept in discussion with wave energy converter (WEC) developers & other stakeholders. • prepare a conceptual design and technical specification. • select a location. • prepare an outline assessment of impacts. • gather and analyse evidence to help assess its overall financial feasibility leading to submission to external partners for funding to develop the facility. The study has included discussions with WEC developers to establish their views and requirements of such a facility. Common themes included: • The South West is seen as the optimum area for device proving by nearly all developers. • The principal benefits are seen as reducing risk and programme constraints from permitting and consenting, and reducing up front capital costs. • A water depth of 50-60m would serve the majority of promising devices; an additional area at a depth of 25m would allow one further device to be attracted within the next 10 years. • Developers have varied requirements for support services, but telemetry infrastructure for metocean and WEC monitoring was a common theme. This report focuses on the optimum infrastructure to enable uptake of Wave Hub facilities by WEC developers, however, what can be said from the developer response is that: • there is a key need to provide additional deployment opportunities with significant grid connectivity. • the present, largely untested, UK offshore consenting regime presents a significant uncertainty and programme risk to developers. • the capital costs and risk of providing grid connection infrastructure is considered to be a significant obstacle to developers in deploying demonstration scale device arrays. While these do not in themselves prove the need for the Wave Hub, they do form an essential precursor for the economic study to complete the business case. WGEHUB1214R – Wave Hub Technical Feasibility Study – Final Report (Task 11) – January 2005 ii The analysis of the market and potential “customers”, together with initial assessment of physical and technical constraints led to four principal Wave Hub options being assessed against a combined technical, financial, environmental, health & safety and functionality scoring matrix. The preferred option is to provide a single 33kV armoured sea bed cable to the WEC deployment area, where the following equipment (illustrated in Figure 5.3 on page 50) would be situated on the sea bed: • Four way termination and distribution unit (TDU) - ie a cable splitter • 11/33kV power connection units (PCU) for each of the four cables to the TDU • Umbilical cables from the PCU for pick up and array connection • Independent remotely operable switchgear and electrical protection on each umbilical The requirement for land-side infrastructure is modest, with only a 30 x 30m compound proposed, containing switchgear, monitoring equipment and control room together with storage for operation and maintenance hardware. All the equipment proposed is known technology in current use elsewhere. The sub-sea equipment has been proven in the offshore oil and gas industry. A coarse screening of the whole of the north coast of Cornwall confirmed Hayle as the optimum location for the landfall of the Wave Hub power cable.