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