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Marine Renewable Energy Infrastructure Analysis The Research Prioritisation Action Plan for Marine Renewable Energy (Area J) contains 5 key objectives. Objective 4 relates to infrastructure, specifically: “To ensure that an adequate infrastructure/ecosystem is managed, developed and future needs identified in order to support research across the development spectrum from early stage research to full scale deployment, aligned to the needs of each category of ocean energy technology, engineering materials and ICT in the marine environment.” The specific actions identified in the action plan: J4.1 - Conduct a mapping and gap analysis of research infrastructure for marine renewable energy, including access procedures. J4.2a - Identify and explore options available to ensure on-going, adequate support for the full range of infrastructure required to enable this Priority Area, enabling world class development, commercialisation and deployment of Marine Renewable Energy devices, systems and related ICT. Determine the facilities required to enable research into all key MRE system elements ranging from heavy mechanical engineering and electrical power systems to marine operations and ICT systems. J4.2b - Ensure appropriate mechanisms are in place to facilitate access by HEI/ industry researchers to research infrastructure. J4.3 - Within the policies/strategies for strategic infrastructure, identify the measures including grid, shipping and port infrastructure necessary to support MRE research, development and deployment. J4.4 - Explore further the potential for interconnection between RoI, NI, Scotland and France to accommodate offshore renewable energy, as identified in the ‘ISLES’ (EU INTERREG) project. This report assesses the current state of infrastructure related to Marine Renewable Energy as identified in the Action Plan. It leverages a number of studies and policy documents which have been published in recent years. David McAuley, 2014 Page 1 of 15 Research Infrastructure for device development: The development of ocean energy devices and the associated support systems is dependent of the availability of suitable infrastructure. The type of infrastructure required depends on the stage of development of the technology. Technology Readiness Levels (TRLs) help to define the stage of development. The progression of the development from idea to full scale deployment of marine renewable energy devices requires the availability of testing facilities at different scales. At present, parts of this development path require developers to visit the UK or France’s facilities. Equivalent facilities are being built in Ireland to fulfil this requirement. However, the networks with these countries will remain. Different scales require varied testing facilities, as demonstrated in Table 1 below. TRL Description 0 Idea 1 Basic Research Detail R&D,D,D Marine Renewable Energy Example Infrastructure Unproven concept, no testing has been performed. Research Ideas N/A Principles postulated and observed but no experimental proof available. - Configuration Described. Research Basic principles defined: Type of technology: attenuator or point absorber or oscillating water column, etc. Power take-off system Mooring/foundation type Purpose(s) of technology identified: Electricity generation, water desalination, pumping, etc. N/A Outcome: Concept sketch with annotations and device description. Spend: €1,000 – €250,000 2 Technology Formulation Concept and application have been formulated. Technology Development Stream Initiated. Research First consideration of: Principal dimensions and main components. Target water depth and wave resource requirements. Power production performance, Survivability, manufacturability, deployability. Access for maintenance, operability and decommissioning. Modelling capabilities Outcome: Concept configuration drawings and report. Performance estimates and cost calculations. Spend: €10,000 – €50,000 3 Applied Research First laboratory tests completed; proof of concept. - Initial Product Verification. Research Performance testing: Tank testing physical models in various appropriately- scaled wave conditions at 1:25 – 1:100 scale, Numerical simulation modelling Survivability testing Outcome: System definition, initial survivability result, power matrix, Numerical model, construction cost targets. 1:30 Sacle tank testing - HMRC, Beaufort, UCC Spend: €200k – €500k David McAuley, 2014 Page 2 of 15 4 Small-Scale Prototype In a laboratory environment (ugly prototype). Development Further Performance Testing: Tank testing physical models at increased scale, 1:25 or greater, Numerical simulation modelling, Much more detailed survivability testing Manufacturability assessment, PTO and power train definition, System breakdown and high level, definition of subsystems. Outcomes: Significant development of TRL3 outcomes. System control strategy. SCADA, control and instrumentation requirements defined. Health and safety and maintenance issues considered. Array schematic and business model project based on latest CAPEX, OPEX and power production estimates 1:15 Scale tank testing - Beaufort Research (UCC), Nantes (France) Spend: €0.5 – 1.0m, 9 to 12 months 5 Large-Scale Prototype Tested in intended environment. Development 1:4 Scale Tank testing - Galway Bay Test Site. 6 Prototype System Tested in intended environment close to expected performance. Demonstrati on 1:1 Scale Testing EMEC (Scotland) 7 Demonstrat ion System Operating in operational environment at precommercial scale. Demonstrati on 1:1 Scale Testing Belmullet test site 8 First Commercial System Manufacturing issues solved. Demonstrati on WestWave, Co. Clare. 9 Full Commercial Application Technology available for consumers. Deployment Table 1 – TRLs related to Marine Renewable Energy development. Access procedures: Access to facilities is managed through the EU FP7 “TWENTIES” Project co-ordinated by UCC. Marine Infrastructure Analysis: A number of studies have been carried out to understand the current state of related infrastructure in Ireland. These include recommendations made in the Governments Offshore Renewable Energy Development Plan, SEAIs Supply Chain Opportunity Study, a Ports and Shipping Study, and the Eirgrid Offshore Wind Grid study. These reports are detailed below. A template for tracking the current state of infrastructure and associated activities is provided in Appendix IV. David McAuley, 2014 Page 3 of 15 2014 – Ireland’s Sustainable Energy Supply Chain Opportunity SEAI, in partnership with IDA and Enterprise Ireland, carried out a study of the supply chain for various sustainable energy technologies. It includes analysis of Offshore Wind energy, Wave Energy, and Electricity Transmission Grid. The full report can be found at the link. http://www.seai.ie/Publications/Statistics_Publications/Energy_Modelling_Group_Publications/Ireland% E2%80%99s-Sustainable-Energy-Supply-Chain-Opportunity.pdf Details can be found in Appendix I. 2014 - Offshore Renewable Energy Development Plan, DCENR The Government re-iterated its commitment to the development of Marine Renewable Energy through its OREDP, published in 2014. “The overarching objective of the Government’s energy policy is to ensure secure and sustainable supplies of competitively priced energy to all consumers. The development of Ireland’s renewable energy resources is critical for the achievement of each element of this objective. Cost-effective harnessing of the potential of the clean, sustainable, indigenous, renewable energy resources that Ireland is fortunate to have in abundance, is crucial to reducing our dependence on expensive fossil fuel imports, improving our national competitiveness over time, reducing harmful emissions and delivering growth and jobs in the green economy. These objectives are fully aligned with those of EU energy policy, reflecting the common challenges faced by Ireland, and our partners in Europe, in decarbonising our energy systems and creating a sustainable and competitive EU internal market for energy.” The plan states that “Development of our offshore renewable energy resource will require investment in both Ireland’s grid and ports infrastructure” – See Appendix II for details. David McAuley, 2014 Page 4 of 15 2014 – “Maritime Infrastructure Development Priorities to Support Ireland’s Future Ocean Energy Industry” - Marine Renewable Energy Association The Marine Renewables Industry Association recommends, in summary, that: 1. The State invests in a mobile offshore platform to build up experience and understanding of the capacity of such vessels to make up any short-term shortfall in port facilities to support ocean energy developments. It could also aid the installation of early demonstration arrays. Such a mobile platform could be powered by an ocean energy device. It could be acquired second-hand and used for several purposes besides ocean energy such as fisheries research, marine science etc. 2. The provision of suitable vessels to support ocean energy should be left to the private market place where capable local companies would welcome new business opportunities. However, the Irish Maritime Development Office should actively monitor the situation and communicate any specific needs e.g. incentives to the Ocean Renewable Energy Steering Group. 3. Steps are taken as soon as possible to undertake all necessary planning to provide at least minimum facilities (200m quay, heavy-loading laydown area, etc) to support ocean energy at a port location in Mayo. The Association is conscious of the need to avoid raising expectations and to avoid land speculation. It must be emphasised that this recommendation is made in a measured fashion and it is made only in light of the particularly long leadtime typically encountered in port developments. It represents a ‘hedge’ on future port needs. 4. A review of ports policy, specifically in regard to the marine renewables industry, takes place no later than 2020. At that stage, issues such as market access for marine renewables electricity, and the likely pace of development of wave energy technology should be a great deal clearer than at present while offshore wind developments may be in early prospect off the west coast. This review should be a ‘whole of Government’ exercise, perhaps conducted under the auspices of the recently established Ocean Renewable Energy Steering Group. David McAuley, 2014 Page 5 of 15 2011 - Assessment of the Irish Ports & Shipping Requirements for the Marine Renewable Energy Industry – Marine Institute and SEAI http://www.seai.ie/Renewables/Energy_Research_Portal/National-EnergyResearch/Marine_Renewable_Energy/Marine-Publications/Shipping-and-Ports-Requirements.pdf This study of Ireland’s shipping and ports infrastructure begins by establishing the geographical distribution of ocean renewable energy around the Irish coast. This is necessary to determine the appropriate port resources needed for developments at the various coastal locations. In general it is established that the east coast is best placed to support fixed offshore wind and tidal installations, whereas the south and west coasts are best placed to support wave, fixed and floating wind installations. In terms of shipping, the study assesses the vessel type and the numbers required for various deployment scenarios for marine renewable energy in Ireland, under the heading of Offshore Wind, using an example of the fleet deployed during the installation of the Thanet offshore windfarm in UK waters. It is shown that an assorted fleet of up to 35 specialised vessels is necessary for this scale of deployment. The status of Irish vessel owners with respect to marine renewable energy developments and their capability to provide appropriate vessels is then established. Four significant ship-owning companies are operating in Ireland, based in Wicklow, Waterford, Cork and Killybegs. The study identifies a spatial framework of first-phase port locations for wind, wave and tidal developments. It is established that the development of the offshore renewable energy industry is an economic growth opportunity that can bring benefits to many areas of Ireland. To take this opportunity there is a need to bring forward a first phase of port locations that establish a competitive position for Ireland in this market. As the industry develops, and builds on existing strengths, a wider range of locations will play important roles. The total capital expenditure for offshore wind projects for developing 30GW of offshore wind in the UK alone is estimated to be between €88bn and €102bn. The initial focus on a first phase of locations will complement other actions drawing on Ireland’s energy and engineering experience that would ensure that Ireland may also benefit from this European opportunity. The development of appropriate locations is critical to Ireland becoming a base for construction and assembly of wind turbines and marine devices. Suitable locations are also required to grasp the opportunity to develop operations and maintenance hubs for offshore wind and wave farms both in the Irish Sea and off the Atlantic coast of Ireland. David McAuley, 2014 Page 6 of 15 2011 – Offshore Wind Study SEAI/Garrad Hassan Study The Sustainable Energy Authority of Ireland (SEAI) appointed GL Garrad Hassan (GLGH) to undertake an assessment of the industrial development potential of offshore wind in Ireland. The assessment is intended to assist SEAI and the Government of Ireland in analysing and developing targets, programmes and policies to develop Ireland’s offshore wind energy resources. The scope of work covered three broad areas; the current situation for offshore wind in Ireland, a review of international technology and supply trends in the industry, and scenario modelling to analyse the industrial development potential associated with varying degrees of future offshore wind deployment activity in Irish waters. 2011 – Eirgrid Offshore Grid Study Analysis of the offshore electrical grid requirements to facilitate the deployment of marine renewable energy. http://www.seai.ie/Renewables/Energy_Research_Portal/National-EnergyResearch/Marine_Renewable_Energy/Marine-Publications/Eirgrid-Offshore-Grid-Study-2011.pdf 2009 - ENGINEERING & SPECIALIST SUPPORT REQUIREMENTS FOR THE OE SECTOR http://www.seai.ie/Renewables/Energy_Research_Portal/National-EnergyResearch/Marine_Renewable_Energy/Marine-Publications/Marine-Engineering-and-Specialist-Support2009.pdf David McAuley, 2014 Page 7 of 15 APPENDIX I Supply Chain Study – Offshore Wind Energy 2011 Assessment of the Irish Ports & Shipping Requirements for the Marine Renewable Energy Industry http://www.seai.ie/Renewables/Energy_Research_Portal/National-Energy-Research/Marine_Renewable_Energy/MarinePublications/Shipping-and-Ports-Requirements.pdf David McAuley, 2014 Page 8 of 15 APPENDIX II OREDP Offshore Renewable Energy Development Plan (OREDP), 2014 http://www.seai.ie/Renewables/Energy_Research_Portal/National-Energy-Research/Marine_Renewable_Energy/OREDP-2014.pdf Extract related to Grid and Ports Infrastructure: Infrastructure Development of our offshore renewable energy resource will require investment in both Ireland’s grid and ports infrastructure. Grid Grid investment will cover reinforcement of the onshore grid, ensuring the overall grid is capable of handling increasing amounts of variable renewable generation, and ultimately development of an offshore grid. Ireland, working closely with Northern Ireland, is at the forefront of EU Member States in progressing the network development and system operation tools necessary to accommodate very high levels of renewable energy in our Single Electricity Market (SEM). There is also a high level of involvement in regional and EU grid development initiatives, signalling the importance of developing the grid to ensure the realisation of a pan-European energy market that facilitates the realisation of the potential of sustainable renewable energy, including that from offshore sources. The overarching aim of Eirgrid’s Grid 25 plan is to ensure that the supply of electricity to all consumers in Ireland, both domestic and commercial, is secure and reliable in the long term, while also allowing the integration of increasing amounts of instantaneous renewable generation. Consisting of over 150 individual projects, Grid 25 will see the upgrading of 2,200 kilometres of existing transmission lines and the building of 1,050 kilometres of new transmission lines, doubling the current size of Ireland’s electricity grid. In addition, there is now over 2,100 MW of renewable generation installed in Ireland. With renewable generation capacity set to reach in the region of 4,000 MW to deliver 40% of electricity from renewable sources in Ireland by 2020, managing such a large amount of variable generation on a small island system presents a unique set of operational challenges. The DS3 programme has been established by EirGrid and the System Operator for Northern Ireland (SONI) to develop system operations solutions to ensure the secure and safe operation of the all island power system as we move towards progressively higher levels of variable renewable penetration. In tandem with the work to plan for the future development and operation of Ireland’s electricity grid, and in order to develop a strategic understanding of the future network requirements of offshore renewable energy, EirGrid undertook an Offshore Grid Study, the first part of which was published in 2011. Key findings of the study were that an offshore network should be meshed (as opposed to a radial approach connecting individual offshore generators to the onshore grid) and, to ensure cost effectiveness, developed incrementally in a way that would be symbiotic with the onshore grid and in line with Grid 25. The study also identified the potential to use offshore generation points as interconnection points. David McAuley, 2014 Page 9 of 15 In June 2012 the Irish-Scottish Links on Energy Study (ISLES) reported on the feasibility of creating an offshore interconnected electricity grid linking the three jurisdictions based on renewable resources of wind, wave and tidal. The project is firmly grounded in EU energy policy objectives, in particular, the long term strategic planning necessary to achieve the technological shift needed to develop the trans-European energy networks required to decarbonise EU energy systems. The study estimates an initial maximum resource potential of 16.1 GW (12.1 GW wind and 4 GW of wave and tidal) in the ISLES areas, requiring a capital expenditure in the order of €6.74 billion to harness it. It also found that, while the technology for an ISLES network is available, complexity does arise in the range of regulatory regimes across the three jurisdictions. The next phase of the ISLES project will focus on further analysis of the environmental and regulatory requirements of a cross-jurisdictional offshore grid. In May 2013, EU Regulation 347 of 2013 on Guidelines for trans-European Energy Infrastructure, came into force. Using the criteria set out in the Regulation, an EU list of electricity Projects of Common Interest (PCI), relating to transmission system development and storage, was established in October 2013. PCI’s will benefit from accelerated planning processes, cross-border cost allocation and the opportunity to apply for EU financial assistance under the Connecting Europe Facility. While no offshore grid projects have been proposed for PCI status for this initial list, the PCI selection process utilises the on-going work of the North Seas Countries Offshore Grid Initiative (NSCOGI). The NSCOGI, in which Ireland participates, is charged with evaluating and facilitating the coordinated development of a possible offshore grid that maximises the efficient and economic use of renewable energy resources and infrastructure investments. The next call for PCI proposals under Regulation 347 of 2013 will be held by the European Commission in 2015. Ports The development of offshore renewable energy represents a significant opportunity for our ports, particularly those along the western seaboard. They will play a crucial role in facilitating the necessary development of both offshore renewable generation and grid infrastructure, requiring investment to handle the necessary plant, equipment and cabling, and the associated shipping during both the construction, and operation and maintenance phases of future projects. The 2013 National Ports Policy highlights that a number of Ports of National Significance have completed or commenced port master planning. In addition, as part of the emerging revised European TEN-T network, the Department of Transport, Tourism and Sport (DTTAS) is seeking to ensure that a number of port hinterland priorities are included as part of the proposed “core network”. These priorities encompass both road and rail links. The development of offshore renewable energy will complement these developments, increasing tonnage, turnover, profits and employment in key ports. In addition, in relation to the emerging ocean energy sector, the Irish Maritime Development Office Report on Irish Ports Offshore Renewable Energy Services, published in 2012, concluded that the three Ports of National Significance (Tier 1) had the greatest potential in servicing current and future demand in the offshore renewable energy sector. The report additionally identified the two Ports of National Significance (Tier 2), as well as Galway Harbour Company and Killybegs Fishery Harbour Centre, as having important potential in terms of servicing future demand in this sector. National Ports Policy endorses these findings. David McAuley, 2014 Page 10 of 15 Investment in ports is treated here as infrastructure investment. Investment for the construction phase is likely to follow the projects, i.e. investment in port facilities required for installation vessels, workboats and transhipment of major components is not justified until projects commence. The large UK Round 3 Irish Sea project (4200 MW) is a possible exception: advance investment in an Irish port might conceivably gain business that would otherwise go to a UK port. This seems a risky strategy, and detailed investigation would be necessary before committing significant investment. The same argument applies to port investment for O&M services: advance investment is unlikely to gain a significant advantage for Irish ports. Service ports are selected for location and accessibility – after which investment to bring these up to standard can be made. 4.2 Measures aimed at industry / supply chain development Three main options have been identified for the involvement of Irish companies in the offshore wind supply chain: Foundation manufacturing, aimed at projects in ROI and western UK waters. Tower manufacturing could be included. A concerted effort from Irish Industrial Development Agencies to promote Irish facilities to the entire offshore wind supply chain similar to that undertaken by Invest NI and DETI in the UK could be successful in attracting some supply chain companies to Ireland. Vessels for foundation and turbine installation, and turbine repair, again aimed at projects in ROI and western UK waters. Providing a home and support services for such vessels may be more attractive than Irish ownership, as owners of fleets tend to have an advantage. Foundation and tower manufacturing A study of the comparative advantages of foundation manufacture in Ireland may be justified. The Irish Sea is not just separated from the North Sea by distance, it is also characterized by very demanding seabed conditions – suggesting that there may be an opportunity for an innovative local solution. Added to this, there are several Irish firms well-placed to play a part in delivery of some candidate solutions although some industry acquaintance work is needed – perhaps achievable through a demonstration project programme. If monopiles are the preferred foundation type, a manufacturing facility may gain some advantage by also making towers. Such a facility should aim at projects in ROI and western UK waters. In particular, gaining work from western UK projects prior to 2020 would be an advantage. David McAuley, 2014 Page 11 of 15 Vessels for foundation and turbine installation, and turbine repair The analysis in earlier sections indicates a need for one to three vessels for Irish projects, from around 2020 onwards. The requirement for UK projects is much greater, and starts earlier, and should be open to vessels based in Ireland. However, operating such vessels tends to favour larger organisations operating a fleet, and the large vessel sector in Ireland is weak. On balance, support measures may best be directed towards support services. O&M bases No measures are considered to have value on this front. Other As a background activity, regular updating of forecasts for progress of offshore projects in European waters would be useful for government and industry in Ireland. 4.4 R&D actions aimed at gaining market share Short-term: Foundation demonstration to promote foundations optimised for Irish Sea sites Turbine demonstration onshore and offshore, or combined foundation and turbine demonstration. Turbine and foundation manufacturers are currently looking for sites to carry out these activities both onshore and offshore Investigation of floating turbine demonstration possibilities in the extreme wind and wave climate off the West coast Demand-side system management measures to allow increasing penetration of renewables into the Irish island system Long-term: Collaborative work with neighbouring nations on interconnection to support the policy harmonisation and market opening efforts but also to define the optimum topology for interconnection Floating wind R&D, possibly collaborative with other countries sharing same deep water characteristics e.g. Spain, Norway, Scotland. ----------------------------------------------------------------------------------------------------- David McAuley, 2014 Page 12 of 15 APPENDIX IV Matrix of Needs for Marine Renewable Energy Research Theme Specific Needs Existing Activities Devices Wave tank testing Ocean Test beds Performance and Reliability of Devices Performance Verification: . Scaling similarities / differences for devices with moving parts. . Test Protocols . Performance metrics (e.g. Yield per Tonne) . Strucutral Engineering Power Take - Off Grid Interconnection topology Beaufort Research AMETS / SmartBay HMRC, ETCI, NSAI, ESB HMRC, ETCI, NSAI, ESB HMRC, ETCI, NSAI, ESB Ports Analysis of the ports and shipping requirements Eirgrid offshore grid study Infrastructure Electrical Grid Mooring for deep--‐sea installations of wind, tidal Power electronics – HVDC converters Electrical integration of energy from dispersed & variable sources (wind, wave etc.) Integrated Infrastructure Maritime Transport Resource Policy David McAuley, 2014 HMRC, ETCI, NSAI, ESB HMRC, ETCI, NSAI, ESB HMRC, ETCI, NSAI, ESB HMRC, ETCI, NSAI, ESB ISLES Project / North Sea Grid Initiative HMRC, UCD Mark O'Malley UCD Irish Maritime Development Office Prediction Mapping Understanding deep--‐sea wave, wind patterns; Seabed mapping; ESBi ESBi HMRC Market Development – environmental impacts, regulations Underpinning Research Research in Support of Policy Collation of Marine socio-economic data Public perception and acceptance SEAI, ESB, Marine Institute GSI UCC, HMRC, UL UCC, HMRC, UL SEAI, ESB, Marine Institute Page 13 of 15 ICT Data analytics - wind, wave, smart grid Reducing cost of offshore wind – remote monitoring (SCADA) & actuation Robust, rugged Communications & Sensors for deployment on devices Digital design and simulation tools Subsea and wireless communication systems Long range “over the horizon” communications Web enabled sensor networks Satellite to seafloor sensing Data management systems GIS Seabed mapping Forecast models. Security and Surveillance Materials Materials for wind energy turbines, Wind turbine blades. Advanced composite materials to reduce cost and increase device efficiencies Environment Strategic Environmental Assessment (SEA) - OREDP Environmental monitoring Commercialisation Manufacturing Supply Chain analysis Eirgrid Siemens, ABB Ireland TechMarine IBM, RPS Irish Naval Service IBM MI Commissioner for Irish Lights GSI GSI, MI MI, HMRC Port Authorities DCENR, DOE EI Marine Renewables Industry Association “Productisation” of research expertise in HEIs Interactions Between industry and environment. David McAuley, 2014 Page 14 of 15 APPENDIX V Inventory of Marine Energy Research Projects (2012) Review of the supply chain needs of Irish ocean energy SEAGRID: A New Dynamic Modelling Tool for Power System Analysis of Ocean Energy Devices The nonlinear evolution of phases and energy cascades in discrete wave turbulence systems West Wave Energy Project -- Pre-Consenting Phase 2011 Blue Power Buoy 1 Parsons Award for Ocean Wave-Obs: Towards ocean wave energy-potential quantification from a terrestrially-based seismic observation system Omey Labs Ltd Elastomeric Mooring Components for Wave Energy Devices Marine Renewables Infrastructure Network (MARINET) CFD Investigation of Marine Current Turbines Wave energy systems Ocean Energy Prototype RD&D OpenHydro Technology Ltd Recovery of 10 metre turbine utilising enhanced recovery approach Elastomeric Mooring Components for Wave Energy Devices Simulation of Sea Surface Waves for the Evaluation of Wave Energy Conversion Technologies MARINA - Reference methods for managing the risks of engineered nanomaterials Electrical Aspects of Wave Energy Converters (WECs) Ocean Energy Programme - Cyan Technologies Ltd OpenHydro Process Value Engineering Analysis and Cost Reduction Redesign of the 16m Tidal Turbine EI EU Proposal Supports - Several projects Ocean Energy Programme - Sea Power Ltd Validation and development of a wave energy attenuator/amplifier concept NAVITAS Ocean Energy Programme Further 1/50 scale testing and 1/15 scale design and testing of a novel wave energy device - The Wave Pump Wave Energy Test Sites Support 2012 Modelling and Observation of Surface Currents in Galway Bay 2012 Sea Power Platform- Power Take Off CPVM (PTO-CPVM) Project: Acoustic Monitoring for Ocean Energy Devices - Phases1b and 2 Physical Modelling of a Prototype Tidal Flow Accelerator David McAuley, 2014 Page 15 of 15