The Severn Estuary - A sustainable low carbon energy resource - Peter Kydd


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The Severn Estuary - A sustainable low carbon energy resource.
Presented by Peter Kydd at the Sustainable Severn Conference held in April 2013.

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The Severn Estuary - A sustainable low carbon energy resource - Peter Kydd

  1. 1. The Severn EstuaryA sustainable low carbon energy resourcePeter KyddChair, SWMEPDirector of Strategic Consulting, Parsons BrinckerhoffApril 20131
  2. 2. Low carbon drives significant electricity growth2Beyond 2020
  3. 3. Possible growth roadmap for UK3Beyond 2020Decade 12013-2020Cap. 100 GWNew Gas buildOn and Offshore WindBiomass, Biofuel and SolarInvestment begun in new nuclearInterconnector to Ireland/Norway?Decade 22020-2030Cap. 120 GWNew nuclear buildOffshore Wind – and early wavePossible CCS technology?Interconnectors to EuropeSmart Grid technologyDecade 32030-2040Cap. 150 GWElectrification of heat and transportWind at peak - floating windFirst large wave projectsGas with CCS? Cost?Energy storage solutionsDecade 42040-2050Cap. 200 GWAll Low Carbon Technologiesdeployed at scaleTidal stream first arraysFirst Tidal Lagoon 200-600MWNew turbine and caisson designsdeveloped – low head, fish friendlyLarger Tidal Stream ArraysTidal Tech. for shallow/slower sitesLagoons using new tech proven withlower installations costsLarger lagoon schemes- Severn /UKFull potential of Severn harnessedwith combined technology approachInc. wave and floating windLarger tidal range projects UK &worldwide - Asia and sub-continent
  4. 4. Balanced Technology ApproachRegenSW document published in November 2012Sustainable Severn4
  5. 5. Tidal Power OpportunitiesSustainable Severn5
  6. 6. An Incremental ApproachStepping Stones – a tidal lagoon designed to reduce cost and impact.Objectives• To demonstrate that tidal power can be generated from the Severn Estuary with acceptablecost, environmental and social impacts and build UK confidence in ocean energy• To be informed by the Severn Tidal Power Feasibility Study research and add to thatresearch base through full scale demonstration• To be financeable in the private sector but developed in partnership with the public sectorConstraints• Should not compromise future development of the short listed options in the Severn TidalPower Feasibility Study• Should not impact Severnside Ports• Should not involve significant habitat and ecological loss• Should be competitive with offshore wind in the long term6A new concept for the Severn
  7. 7. 7Downstream of STPFS projectsStepping Stones Tidal LagoonStepping StonesTidal Lagoon
  8. 8. Key DetailsTechnical Data• 600MW of installed capacity (bulb turbines operating on ebb and flood tides)• 1.2TWh per year of energy production• £1.7bn construction cost (built up using same principles as STP)• Lagoon surface area: 18sq km• Length of lagoon impoundment: 10.6km• Construction Period: 4 years (preceded by 5 years in planning/consents)• Largest tidal power plant in the world• Cost of Energy @ 10% (including construction + decommissioning costs)• Financing period (30 years): £193/MWh or £160/MWh @ 2% inflation (based on ratio ofcost to energy over the period)• Residual operating life (90 years): £30/MWh, (or less in real terms as ratio of cost toenergy will reduce with inflation)8Stepping Stones Tidal Lagoon
  9. 9. 9A stepping stone to tidal power developmentStepping Stones Tidal Lagoon
  10. 10. 10Uses conventional construction and technology elementsStepping Stones Tidal LagoonLagoon Long SectionEmbankment from Aberthaw PS – 1.4km, crest level +8mAOD with 2.5m wavewall, access road and cable conduit, 1:2.5 and 1:2 side slopes, crest width 10m600m Plain caissons, depth 25m with 2.5 m wave wall, access road and cable conduit480m turbine caissons, depth 32mPlain caissons, crest level: +6mAOD, depth 22m(2.4km), 24m (1.5km) and 25m (3km)Embankment from Barry – 0.66km420m Plain caissons, crest level: +8m AOD,depth 24m and 40m lock caisson, depth 26m
  11. 11. 11New Plain Caisson design to form main lagoon wallStepping Stones Tidal Lagoon
  12. 12. Environmental considerations are importantKey Points• Ebb and flood operation and lagoon site - loss of habitats minimised;• Avoids rivers that are important for migratory fish;• Avoids direct loss of internationally designated habitats although there is some impact onEast Aberthaw SSSI;• The scheme does not enclose the mouth of the estuary and hence impacts on ports,navigation and the famous tidal ‘bore’ are small;• The size of the lagoon means that material ‘far-field’ effects on water levels are unlikely;• The risk of water quality effects within the lagoon, already identified as small in STPstudies, will be reduced further because the lagoon does not enclose any major outfalls orrivers;• Aberthaw PS outfall adjacent to the lagoon will require detailed study• Sea bed conditions known so uncertainty issues of deep silt/mud are much lower projectrisk12Stepping Stones Tidal Lagoon
  13. 13. Potential Regional Economics BenefitsKey Points• Severnside Ports and other commercial sea-bed users are not expected to be adverselyimpacted;• Existing technology = low risk and ready to go...• 4,000 jobs created (of which 2,000 would be local construction jobs) over the 4 yearconstruction period with a further 1,800 of associated indirect jobs in the local community• 80 permanent jobs would be created to operate the new power station• As the largest tidal power plant in the world, tourism and educational opportunities wouldbe created• Over 1 million tonnes of carbon dioxide emissions would be saved annually• Potential to replicate in other locations• Positions UK as global hub for ocean energy and green investment• Able to contribute off peak energy in alignment with smart grid for distribute storage/electricvehicle charging et al, as that market develops13Stepping Stones Tidal Lagoon
  14. 14. 14Thank youStepping Stones Tidal Lagoon