1. Title slide/end slide image dimensions: Title slide images must always fit this size: Height: 10.6 cm; Width: 25.4 cm Title slide images must always follow this position: Horizontal: 0 cm; Vertical: 0 cm To change title slide/end slide image: Contact Communication Support Tip: Vestas drawing guides will help you position and crop images and objects. Images and objects will snap to drawing guides when repositioned or cropped. To add drawing guides: Right-click on next to slide Select ‘Grid and Guides…’ Check ‘Display drawing guides on screen’ Press ‘OK’ V164-8.0 MW TM “Selecting the Optimum Drive Train”.… Anders Bach Andersen Senior Product Manager - V164-8.0 MW TM

2. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 2 Agenda 1. Design Drivers for the V164-8.0 MW TM 2. Evaluation Method 3. Selection of Drive Train

3. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 3 Disclaimer : This document belongs to Vestas Wind Systems A/S. While all information contained in this document has been gathered with all due care, Vestas does not warrant or represent that the information is free from errors or omission, or that it is exhaustive. Vestas disclaims, to the extent permitted by law, all warranties, representations or endorsements, express or implied, with regard to the information available in or through the document, including all implied warranties of merchantability, fitness for a particular purpose, or non-infringement. Vestas does not warrant or accept any liability in relation to the quality, operability or accuracy of the information in this Document. Neither Vestas nor its employees shall have any liability (including but not limited to liability by reason of negligence) to that third party for any loss, damage, cost or expense whether direct, indirect consequential or special, incurred by, or arising by reason of, any person using or relying on the information and whether caused by reason of any error, omission or misrepresentation in the document or otherwise. All third parties will be responsible for making their own assessment of the information and should verify all relevant representations, statements and information with their own professional advisers.

4. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 1 Design Drivers for the V164-8.0 MW TM

5. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 5 Lower Cost of Energy = Higher Return on Investment High energy capture High availability at high wind High reliability Low maintenance High serviceability High yield Low OPEX & Less downtime Cost of Energy embraces all aspects in wind power performance Annualized CAPEX + Annualized OPEX Annual Energy Production CoE =

6. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 6 Higher Business Case Certainty Business case certainty is the customers certainty for achieving the return on investment as anticipated at the time of final investment decision. Calculated IRR at final investment decision “Business Case Certainty” Return on Investment Probability Illustration IRR [%] Probability [%] Good Poor

7. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 7 2 Evaluation Method

8. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu Advanced Cost of Energy-model Adopting Customer’s Perspective Technology assessments Market assessments Customer value Market conditions consolidated into reference sites Average wind speed Water depth Park size Cost and performance modelling of technologies Rotor diameter Rated Power Tip speed Drive train ….. Customer value is quantified in cash flow models to identify optimum choices Output: Cost of Energy Return of investment Business Case Certainty … Foundation cost model Array cable cost model Load to Cost Power curve 8 Illustrative numbers shown

9. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 3 Drive Train Selection

10. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 10 Making the right design choices Using a 360 degree development process and competing work streams

11. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 11 Drive Train Cost Effectiveness (CAPEX) Full Paper figure 4: Illustrative drive train cost scaling (Dimensions for illustration only) Full Paper Figure 5: Fatigue loads applied to the foundation as a function of tip speed, other parameters kept the same. Geared drive trains showed more favorable cost scaling for the high torque needed for next generation offshore turbines. Torque reduction by tip speed increase will increase loads for structural components, not at least the foundation.

12. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 12 Energy Efficiency (Annual Energy Production) Full Paper Figure 6: Indicative drive train efficiency as a function of power (Note bottom line is not zero) Medium speed and direct drive provided the same approximately the same power curve performance

13. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 13 Drive Train Reliability (OPEX) Full Paper Figure 9: Illustrative lifetime replacement rates (Dimensions for illustration only) Removable of parallel stages in the medium speed drive train reduce failure sources and a larger generator increases failure sources.

14. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 14 Medium Speed Drive Offers Highest Return on Investment Both CAPEX, OPEX and supply chain risk are considered in the benchmark Medium speed offers the highest return on investment when replacement rates for both concepts is factored in. Direct drive IRR has higher sensitivity to replacement rates. Number of terminations, amount insulation and air-gap control will lower the direct drive generator reliability. The medium speed drive train is less sensitive to price and availability of strategic raw materials. Medium speed offers higher return on investment

15. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 15 Two strong arguments: Price and availability? Supply Chain Risk for Direct Drive?

16. Add presentation information via View/Header and Footer To add pre-formatted bullets please use the increase/decrease indent buttons found in the PowerPoint menu 16 The V164-8.0 MW TM Drivetrain Main shaftMain bearing housingBed frame Separate wind loads and torque will minimize undesired loads in the drivetrain GearboxGeneratorCoupling Only torque Wind loads transferred to tower top

17. Title slide/end slide image dimensions: Title slide images must always fit this size: Height: 10.6 cm; Width: 25.4 cm Title slide images must always follow this position: Horizontal: 0 cm; Vertical: 0 cm To change title slide/end slide image: Contact Communication Support Tip: Vestas drawing guides will help you position and crop images and objects. Images and objects will snap to drawing guides when repositioned or cropped. To add drawing guides: Right-click on next to slide Select ‘Grid and Guides…’ Check ‘Display drawing guides on screen’ Press ‘OK’ Copyright Notice © 2011 Vestas Wind Systems A/S. All rights reserved. This document was created by Vestas Wind Systems A/S on behalf of the Vestas Group and contains copyrighted material, trademarks and other proprietary information. This document or parts thereof may not be reproduced, altered or copied in any form or by any means without the prior written permission of Vestas Wind Systems A/S. All specifications are for information only and are subject to change without notice. Vestas Wind Systems A/S does not make any representations or extend any warranties, expressed or implied, as to the adequacy or accuracy of this information. This product is in its current form a 50 Hz version and therefore not available for 60 Hz markets. This product will not be released for sale in all locations/countries. Vestas Wind Systems A/S shall not have any responsibility or liability whatsoever for the results of use of the documents by you. Thank you for your attention