1. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW - experience from realized projects and future challenges. AREVA Energietechnik GmbH Königsbrücker Straße 124 01099 Dresden, Germany AREVA T&D UK Ltd St Leonards Avenue ST17 4LX STAFFORD Staffordshire, United Kingdom Uwe Gierer, Sven Höpfner Richard Cooke

2. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 2 2 Wind Power Goes Offshore  Introduction  First of the First  Painting Systems  Materials Selection  Mechanical Design Concepts  Two Years Later  The Hermetic Transformer  A new corrosion protection system for radiators  Larger Projects  The sea-water cooling system  The AREVA Offshore Platform (AOP)  Other Offshore Platform Concepts  Summary

3. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 3 3 Wind Power Goes Offshore  Offshore – Wind Farms  WTG‘s from 3 to 6 MW  Pilot phase: wind farm sizes from 300 to 500 MW  Regulation  New offshore grid code requirements  New legislation (i.e. infrastructure planning accleration law - Germany 12-2006)  HSE standards under development (based on Oil & Gas standards)  Technical & commercial challenges  Connection via HVDC  Limited number of special vessels / heavy lift cranes  Manufacturing and offshore installation of sea cables / WTG  Financing and insurance issues

4. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 4 4  Development of Wind Turbine Generators Wind Power Development Wind power increases linear with the blades span and with the third power of the wind speed Blade area 220 – 240 m 300 m

5. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 5 5 DolWin Tender cxx Grid connection point Diele Grid connection point Brunsbüttel HelWin Tender cxx BorWin Project under construction SylWin Tender cxx Actual Situation in the German North Sea

6. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 6 6 Possibilities to Connect Offshore Grids Overview  Selection criteria  Technical advantages vs. disadvantages  Fulfilment of grid connection requirements  Investment costs  Operation costs  Possibility to expand  Systems availability  Manufacturing capabilities + delivery times  Options  High voltage alternate current (HV AC)  High voltage direct current HVDC (VSC technology)  High volage direct current HVDC (LCC technology with synchronous compensators)

7. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 7 7 Wind Power Goes Offshore  Introduction  First of the First  Painting Systems  Materials Selection  Mechanical Design Concepts  Two Years Later  The Hermetic Transformer  A new corrosion protection system for radiators  Larger Projects  The sea-water cooling system  The AREVA Offshore Platform (AOP)  Other Offshore Platform Concepts  Summary

8. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 8 8 ►Completion: 06-2006 ►Platform: Substation 33 kV / 132 kV  Length – 23m  Width – 15m  Height – 10m  Weight – 440 tons ►Power: 30 x 3 MW = 90 MW ►AC connection to Heysham S/S (UK) ►Cable length: 28 km (thereof 24 km sea cable) ►Water depth: approx. 20 m ◆ Tidal range 10 m ◆ High waves First Of the First - Barrow (UK), 90 MW

9. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 9 9 Barrow (UK), 90 MW cont’d  Modularised equipment ►33kV Board – including protection ►33/132kV 120MVA Transformer with OLTC ►132kV GIS ►Relay and control panel suite room ►Container for LVAC und DC system (incl. UPS for nautical systems) ►225kVA auxiliary diesel generator ►Emergency shelter und workshop container ►5MVAr Shunt capacitor bank modules ►HVAC Systems ►INERGEN / water fire extinguishing system

10. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 10 Painting Systems / Materials Selection Typical hand rail socket External module door hinge

11. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 11 Mechanical Design Concepts Typical door sill with external seal Typical optimised door design

12. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 12 Wind Power Goes Offshore  Introduction  First of the First  Painting Systems  Materials Selection  Mechanical Design Concepts  Two Years Later  The Hermetic Transformer  A new corrosion protection system for radiators  Larger Projects  The sea-water cooling system  The AREVA Offshore Platform (AOP)  Other Offshore Platform Concepts  Summary

13. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 13 Robin Rigg (UK), 180 MW ►Completion: 07-2009 ►Platform: 33 kV / 132 kV ►Power: 60 x 3 MW = 180 MW ►AC connection to Seaton S/S (UK network) ►Cable length: 12 km (thereof 9 km sea cable) ►Water depth: approx. 30 m

14. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 14 Robin Rigg (UK), 180 MW cont’  Twin platforms, each  Length – 50 m  Width – 30 m  Heigh – 12 m  Weight – 680 tons

15. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 15 ►Completion: 09-2008 ►Platform: 33 kV / 110 kV ►Power: 12 x 5 MW = 60 MW ►AC connection to German mainland via island Norderney ►Cable length: 60 km ►Water depth: approx. 30 m  Platform,  Length – 24 m  Width – 18 m  Height – 10 m  Weight – 700 tons Alpha Ventus (Germany), 60 MW

16. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 16 Alpha Ventus (Germany), 60 MW cont‘d Quelle: IMS Ingenieurgesellschaft mbH

17. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 17 Onshore Erection Site - Alpha Ventus 60 MW GIS – Installation in container Offshore batterie system Erection site (w/o transformer)

18. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 18 Offshore Installation - Alpha Ventus 60 MW

19. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 19 Hermetic Transformer for Alpha Ventus

20. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 20 Profit Calculation, DIN Standard / Hermetic Transformer

21. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 21 A new corrosion protection system for radiators radiator with cataphoretic painting Salt spray test after 1,500h max. undermining 0.7 µm (allowed 1 µm)

22. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 22 Wind Power Goes Offshore  Introduction  First of the First  Painting Systems  Materials Selection  Mechanical Design Concepts  Two Years Later  The Hermetic Transformer  A new corrosion protection system for radiators  Larger Projects  The sea-water cooling system  The AREVA Offshore Platform (AOP)  Other Offshore Platform Concepts  Summary

23. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 23 The sea-water cooling system

24. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 24 Multi Purpose Platform Multi Purpose Platform (MPP)

25. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 25 Multi Purpose Platform Multi Purpose Plattform (MPP) – Suction buckets / anchors

26. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 26 AREVA Offshore Platform (AOP) Patent pending

27. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 27 AREVA Offshore Plattform Fundation variants Patent pending

28. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 28 Use of jacking system as part of Transformer off loading solution STRAND JACKS TRANSFORMER & SUPPORT GRILLAGE

29. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 29 Wind Power Goes Offshore  Introduction  First of the First  Painting Systems  Materials Selection  Mechanical Design Concepts  Fabrication Approaches  Two Years Later  The Hermetic Transformer  A new corrosion protection system for radiators  Larger Projects  The sea-water cooling system  The AREVA Offshore Platform (AOP)  Other Offshore Platform Concepts  Summary

30. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 30 Summary  First projects of its kind projects have  Steep learning curves with fast transfer to new projects  Harsh operational conditions need  Increased corrosion protection for all systems  Learning from other industries (Oil & Gas, automotive,…)  Weather dependent restricted access need  Minimized offshore installation & service time  Integrated service concepts with wind farm operators  Future wind farms need offshore substations with  Innovations in technical design (such as self-floating and self-installing platforms, centralised water-cooled systems a.o.)  An integrated mechanical & electrical design approach

31. Innovative platform solutions with integrated design for offshore AC substations from 60 MW to 800 MW EOW 2009 31