DECC ANALYSIS OF OPTIONS FOR TIDAL POWER DEVELOPMENT IN THE SEVERN ESTUARY - INTERIM OPTIONS ANALYSIS REPORT VOLUME 2 - APPENDICES B & C December 2008 Prepared by Prepared for Parsons Brinckerhoff Ltd DECC in association with 1 Victoria Street Black & Veatch Ltd London Queen Victoria House SW1 0ET Redland Hill Redland Bristol BS6 6US CONTENTS APPENDIX B ASSESSMENT FRAMEWORK SUMMARY SHEET INITIAL SCREENING QUANTITATIVE WORKSHEET ENVIRONMENTAL WORKSHEET ECONOMIC, SOCIAL AND REGIONAL WORKSHEET APPENDIX C DRAWINGS Figure B1 – Minehead to Aberthaw Barrage – Bondi Figure B2 – Hinkley Point to Lavernock Point Barrage Figure B3 – Brean Down to Lavernock Point Barrage Figure B4 – Inner Barrage Figure B5 – Beachley Barrage Figure F1a – Tidal Fence Proposal. Brean Down to Lavernock Point Figure F1b – Tidal Fence Proposal. Minehead to Aberthaw Figure L2 – Russell Lagoon – Fleming Energy Figure L3a – Land Connected Tidal Lagoon – English Grounds Figure L3b – Land Connected Tidal Lagoon – Welsh Grounds Figure L3c – Land Connected Tidal Lagoon – Peterstone Flats Figure L3d – Land Connected Tidal Lagoon – Bridgwater Bay Figure L3e – Offshore Tidal Lagoons – Bridgwater Bay Figure R1 – Tidal Reef Proposal. Minehead to Aberthaw Figure U1 – Severn Lakes Scheme APPENDIX B ASSESSMENT SCREENING WORKSHEETS SUMMARY SHEET INITIAL SCREENING QUANTITATIVE WORKSHEET ENVIRONMENTAL WORKSHEET ECONOMIC, SOCIAL AND REGIONAL WORKSHEET Severn Tidal Power Development Assessment of Options - Screening of Long-List Options Severn Estuary Tidal Energy Feasibility Study Assessment of Options - Screening of Long-List of Options (to be read in conjunction with Interim Options Analysis Report) SUMMARY SUMMARY Option Option Name Installed Capacity Energy Cost Energy Cost Qualitative Assessment (Technical) Qualitative Assessment (Environment) Economic / Social / Regional Qualitative Assessment Ref. (excluding habitat (inclusive of habitat compensation) compensation - 3:1 ratio) Units: MW p/kWh @ 8% p/kWh @ 8% Specify Key Effects Specify Key Effects Specify Key Effects B1 Minehead to Aberthaw Barrage - 14800 13.94 16.24 Application of existing technology on an unprecedented large Bondi scale. Core operating mode would be ebb only. Flood pumping could increase energy output. Ebb and flood operating mode could be utilised. Could incorporate a second basin. Significant grid reinforcement isses. Capable of contributing to CO2 reduction by 2024. Contribution to low carbon energy generation. Effects Benefits for flood protection may be partly offset by B2 Hinckley Point to Lavernock 9000 13.96 16.67 on water levels and estuary geomorphology lead to risks adverse effects on morphology and drainage. Disruption Point Barrage to internationally designated conservation sites, to fish passage adversely effects recreational and displacement of designated bird species and to fish commercial fishing. Risk of disruption to port industry including designated species. Physical presence risks during and after construction. Adverse effects on Application of existing technology on a scale requiring significant effects on success of fish on passage. Other effects existing regional markets and supply chains. Benefits to financial expenditure. Core operating mode would be ebb only. that may be important but are currently uncertain include the local economy duration construction phase. Effects Flood pumping could increase energy output. Ebb and flood water quality, land/seascape and the historic on other marine uses, tourism/ leisure uncertain but may B3 Brean Down to Lavernock Point 8640 12.94 15.29 operating mode could be utilised. Could incorporate a second environment. be important. Barrage basin. Significant grid reinforcement isses. B2 is capable of contributing to CO2 reduction by 2022 and B3 by 2021. B4 Shoots Barrage 1050 10.40 13.68 Benefits for upstream flood protection may be partly offset by adverse effects on morphology and Contribution to low carbon energy generation. Effects drainage.Disruption to fish passage adversely effects on water levels and estuary geomorphology lead to risks Application of existing technology. Core operating mode would be recreational and commercial fishing. Limited risk of to internationally designated conservation sites, ebb only. Could incorporate a second basin. Compatible with disruption to upstream ports during and after displacement of designated bird species and to fish lagoons or a tidal fence. Operation could be affected by construction. Sedimentation and dredging an issue. including designated species. Physical presence risks sedimentation issues. B4 would require significant grid B5 Beachley Barrage 625 12.58 16.48 effects on success of fish on passage. Other effects Disruption to fish passage adversely effects recreational reinforcement whilst B5 does not. B4 is capable of contributing to that may be important but are currently uncertain include and commercial fishing but only on Severn upstream of CO2 reduction by 2019 and B5 by 2018. water quality, land/seascape and the historic Wye confluence. Sedimentation and dredging an issue. environment. Limited risk of disruption to upstream ports during and after construction. Water quality effects unknown. F1a Tidal Fence - Brean Down to 256 69.40 75 Lavernock Point Application of new technology unproven in a tidal range power Contribution to low carbon energy generation. Effects context. Core operating mode would be ebb and flood. on water levels and estuary geomorphology lead to risks Compatible with a smaller barrage or upstream lagoon. Operation to internationally designated conservation sites, could be affected by durability issues with ducted turbines. F1a displacement of designated bird species and to fish Effects on flood risk uncertain. Disruption to fish shows the energy output is limited by ability to accomodate 5MW including designated species. Effect on passage of fish passage, if occurs, adversely effects recreational and F1b Tidal Fence - Minehead to 1280 22.72 24.2 turbines - maximum 1MW used in assessment. Capable of including designated species will be negative compared commercial fishing. Risk of disruption to port industry Aberthaw contributing to CO2 reduction by 2019. Low energy output relative with present day. Significant effect on tidal currents in during and after construction. to other options. F1b is a large scale application of new the tidal fence vicinity. Other effects that may be technology. Would require grid reinforcement. Capable of important but are currently uncertain include water contributing to CO2 reduction by 2019. quality, land/seascape and the historic environment. Page 1 of 2 Severn Tidal Power Development Assessment of Options - Screening of Long-List Options SUMMARY Option Option Name Installed Capacity Energy Cost Energy Cost Qualitative Assessment (Technical) Qualitative Assessment (Environment) Economic / Social / Regional Qualitative Assessment Ref. (excluding habitat (inclusive of habitat compensation) compensation - 3:1 ratio) L2 Russell Lagoon - Fleming 1360 15.46 20.43 Application of existing technology but not proven in a tidal power Energy context. Core operating mode would be ebb only. Could incorporate a second basin. Compatible with other lagoons, an upstream barrage or a tidal fence. Operation could be affected by sedimentation issues and durability of wall components. Significant grid reinforcement isses. Capable of contributing to CO2 reduction by 2019. L3a Land Connected Tidal Lagoon 760 19.72 22.22 (English Grounds) Contribution to low carbon energy generation. Effects on water levels and estuary geomorphology lead to risks Effects on flood risk uncertain but may increase risk. to internationally designated conservation sites and L3b Land Connected Tidal Lagoon 1360 17.84 23.01 Disruption to fish passage, if it occurs, may adversely displacement of designated bird species. Effect on (Welsh Grounds) Application of existing technology. Requires innovative lower cost effects recreational and commercial fishing. Some risk passage of fish including designated species uncertain. embankment/wall construction not proven in a tidal power context of disruption to port industry during and after Other effects that may be important but are currently L3c Land Connected Tidal Lagoon 1120 15.93 18.06 for economic viability. Core operating mode would be ebb only. construction. Sedimentation and dredging an issue. uncertain include water quality, land/seascape and the (Peterstone Flats) Flood pumping could increase energy output. Ebb and flood historic environment. operating mode could be utilised. Could incorporate a second L3d Land Connected Tidal Lagoon 1360 13.02 16.85 basin. Compatible with other lagoons, an upstream barrage or a (Bridgwater Bay) tidal fence. Operation could be affected by sedimentation issues and durability of innovative wall/embankment. Significant grid L3e(i) Offshore Tidal Lagoon (90km2) 1360 25.90 25.9 reinforcement isses. Capable of contributing to CO2 reduction by 2019. L3e(ii) Offshore Tidal Lagoon (50km2) 760 29.64 29.64 R1 Tidal Reef - Minehead to 5000 Unquantified due to Unquantified Application of new technology unproven in a tidal range power Contribution to low carbon energy generation. Effects Effects on flood risk uncertain. Disruption to fish Aberthaw lack of design data context. Core operating mode would be ebb and flood. Possibly on water levels and estuary geomorphology lead to risks passage, if occurs, adversely affects recreational and compatible with a smaller barrage or upstream lagoon. Operation to internationally