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Severn Estuary Tidal Energy
1. Call for Proposals2. Initial Assessment of Options3. Next Steps
19 September 2008 – Severn Estuary Partnership, Penarth
Peter KyddDirector of Planning & EnvironmentParsons Brinckerhoff
Severn Tidal Power Feasibility Study
Severn Estuary Tidal Energy
PB BV Consortium
Consortium led by Parsons Brinckerhoff appointed by BERR on 28th April 2008 to undertake the Assessment of Options and Strategic Environment Assessment
The consortium is jointly managed by Parsons Brinckerhoff (PB) and Black & Veatch (B&V) and includes over 10 different specialist engineering, cost and environmental consultancies.
Severn Estuary Tidal Energy
Route Map – Assessment of Options
Short-List of Potential Options
SDC Report
Call for Proposals
Strategic Locations
SEA Reasonable Alternatives
Assessment Framework
SEA Scoping & Early Research
Long-List of Potential Options
Fair Basis Estimation of Costs, Programme and
Energy Yield
Optimised Designs, Detailed Assessment of Costs, Programme and
Energy Yield
Public Consultation
Preferred Option
SEA Research, Consultation and Assessment
Environmental Report and Appropriate Assessment
SEA Scoping Report
Call for Information
Severn Estuary Tidal Energy
Route Map – Assessment of Options
SDC Report
Call for Proposals
Strategic Locations
Assessment Framework
Long-List of Potential Options
Fair Basis Estimation of Costs, Programme and
Energy Yield
Severn Estuary Tidal Energy
Potential Options
Ref Option Name
B1 Outer Barrage from Minehead to Aberthaw
B2 Middle Barrage from Hinkley to Lavernock Point (As B3 but lands at Hinkley)
B3 Middle Barrage from Brean Down to Lavernock Point (Cardiff to Weston Barrage)
B4 Inner Barrage (Shoots Barrage)
B5 Beachley Barrage
F1 Tidal Fence Proposal
L2 Lagoon Enclosure on the Welsh Grounds (Fleming Lagoon)
L3 General Tidal Lagoon Proposals
R1 Tidal Reef Proposal
U1 Severn Lake Scheme
Severn Estuary Tidal Energy
Initial Options – Minehead to Aberthaw
Ref Option Name
B1 Outer Barrage – 25TWh per year (conventional Barrage)
F1 Tidal Fence Proposal – 3.5TWh per year (an array of tidal stream turbines proposed by Pulse Tidal))
R1 Tidal Reef Proposal – 20TWh per year ( a new technology – Rotating turbine modules using 2 m head) – proposed by Evans Engineering
Severn Estuary Tidal Energy
Initial Options – Cardiff to Weston (and variants)
Ref Option Name
B3 Lavernock Point to Brean Down – 17TWh per year (conventional Barrage)
F1 Tidal Fence Proposal – 3.5TWh per year (an array of tidal stream turbines)
B2 Variant of B3 that runs to Hinkley Point rather tha Brean Down (improved flood defence and grid connections) – proposed by Shawater
U1 Variant of B3 that employs a 1km wide causeway and adds land, leisure and wave energy developments – Severn Lakes proposal
Severn Estuary Tidal Energy
Initial Options – Upper Estuary Options
Ref Option Name
B4 Shoots Barrage – 2.77TWh per year (conventional Barrage)
B5 Beachley Barrage – smaller than B4 but avoids blocking the Wye
L2 Welsh Grounds – 3TWh/a Tidal Impoundment proposed by Fleming Energy
L3 Tidal Lagoons – various onshore and offshore locations including options proposed by Tidal Electric extending throughout the estuary.
Severn Estuary Tidal Energy
Initial Options – Combinations and Modes of Operation
Potential Combinations
Tidal Lagoons + Smaller Barrage
Multiple Tidal Lagoons
Tidal Fence + Smaller Barrage
Others subject to further study
Modes of Operation
Ebb only
Ebb and Flood
Pump Assisted
Multiple Basins
Severn Estuary Tidal Energy
Fair Basis Cost and Energy Estimates
Application of same principles to all options
• Costs• Breaks each option down into a set of Principal Quantities• Applies consistent rates to principal quantities across all options
• Energy Yield• Applies a consistent energy yield methodology across all options
• Construction Programme• Applies the same start date to each option and common assumptions on
programme length
• Operations• Common approach to operational costs, maintenance costs and “outage”
assumptions.
Severn Estuary Tidal Energy
Assessment Framework for Initial Options
Initial Screen• Technical Feasibility
Quantitative• Energy Outputs and CO2 savings• Levelised Costs
Qualitative• Environmental Effects• Social / Regional and Economic Effects
Sensitivity Testing
Iterative Approach• Review and Updating of Options during assessment
Severn Estuary Tidal Energy
Next Steps
To confirm short-list of options:
• Continued dialogue with Proposers to confirm technical data
• Conclusion of technical analysis
• Application of Assessment Framework
• Submission of Conclusions for review by BERR
• Ministerial Review and Public Consultation on Proposed Short-List