V MW & 2.0 MW High output in modest winds

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1 V MW & 2.0 MW High output in modest winds

2 Innovation in blade technology High output in modest winds With the V MW and V MW models, Vestas introduces two turbines that open up a whole new range of opportunities for exploiting sites with modest wind conditions and low turbulence. The goal of improving the competitiveness of wind power, combined with a desire to supply the large market for turbines in areas with modest wind conditions, led Vestas to develop these two new models, which can generate up to 25 per cent more energy compared to a V MW turbine. The two new turbines thus combine the well proven V MW nacelle with the newly developed 90-metre rotor. Vestas has reduced the nominal output of the turbine to 1.8 MW in areas with IEC category IIA wind speeds i.e. mean wind speeds of up to 8.5 m/s. To optimise the dynamic transmission loads, the V MW turbine has been designed for IEC IIIA sites, where the average wind speed is lower. The new blade is extremely light, a breakthrough Vestas achieved by using a range of new materials. For example, carbon fibre a strong, rigid yet very light material has been used instead of fibreglass for the load carrying structure of the blade. Due to the strength of carbon fibre, it has been possible to reduce the amount of material used for the blades, thus cutting the overall weight even further and consequently reducing loads. In fact, the new 44- metre blades for the V90 rotor are lighter than the 39- metre blades for the V80 rotor. Moreover, Vestas has made great improvements to the airfoil design of the new blades. These airfoils are the first in a new generation, improving energy production, reducing sensitivity to roughness on the leading edge of the blade, and maintaining a good geometrical relationship between one airfoil thickness and the next. The geometry of the new blades was defined by optimising the relationship between the overall impact of load on the turbine and its annual energy production. The airfoil was developed in collaboration with the Risø National Laboratory in. The innovative Vestas blade design improves performance and increases output yet reduces the loads transferred to the machine. 44 metres of innovative blade technology The conventional design approach states that the desire for greater output is inevitably linked with bigger and heavier turbines. This, however, would make it difficult to achieve the overall goal of producing energy at a lower cost price per kilowatt hour. The new V90 blade design features a number of new exciting developments.

3 Hub controller 6 Gearbox 11 Transformer 16 Machine foundation 2 Pitch cylinder 7 Parking brake 12 Blade 17 Yaw gears 3 Blade hub 8 Service crane 13 Blade bearing 18 Composite disc coupling 4 Main shaft 9 VMP-Top controller with converter 14 Rotor lock system 19 OptiSpeed generator 5 Oil cooler Ultrasonic wind sensors Hydraulic unit Generator cooler Power (kw) Power curve V MW & 2.0 MW 2,500 2,250 2,000 1,750 1,500 1,250 1, Wind speed (m/s) V MW V MW

4 Technical specifications Rotor 30 Wind Diameter: 90 m Area swept: 6,362 m 2 Nominal revolutions: 14.9 rpm Operational interval: rpm Number of blades: 3 Power regulation: Pitch/OptiSpeed Air brake: Three separate pitch cylinders Speed (m/s) 25 Hub height: 80 m Tower 30 Pitch Operational data IEC IIA: IEC IIIA: 1,800 kw 2,000 kw Cut-in wind speed: 4 m/s 4 m/s Nominal wind speed: 12 m/s 13 m/s Stop wind speed: 25 m/s 25 m/s Angle (degrees) Generator IEC IIA: IEC IIIA: Type: Asynchronous Asynchronous with OptiSpeed with OptiSpeed Nominal output: 1,800 kw 2,000 kw Operational data: 50 Hz 50 Hz 690 V 690 V Speed (rpm) Generator Gearbox 900 Type: Planetary/helical stages Control 2500 Output Type: Microprocessor-based control of all the turbine functions with the option of remote monitoring. Output regulation and optimisation via OptiSpeed and OptiTip pitch regulation. Power (kw) Hub height: Tower: Nacelle: Rotor: Total: t = metric tons Weight IEC IIA: 80 m 6 t 68 t 36 t 260 t OptiSpeed allows the nominal speed of revolution of both the rotor and the generator to vary by approximately 60%. This minimises both unwanted fluctuations in the output to the grid supply and the loads on the vital parts of the construction. All specifications subject to change without notice.

5 Improved gearboxes Vestas has taken into account the fact that longer blades mean higher loads on the mechanical components of the turbine. As a result, the transmission system in the nacelle has been reinforced. At the same time, adjustments have been made that reinforce the load-transferring bolt connections, the yaw system and the gearbox. As a result of 2 years of field research, analyses, testing and development work in co-oporation with main suppliers of gearboxes, the new turbines are equipped with a completely new, stronger and more efficient gearbox generation. Strong and light tower By implementing a number of improvements in the design, Vestas introduces a new tower for the V and V MW turbines. Intelligent design has resulted in a tower that is lighter. One of the breakthroughs increasing the fatigue strength of the tower was the innovative idea of using magnets to fasten the interior components to the tower wall rather than using welded brackets. Ultimate strength was achieved by using a stronger steel type than previously. The 80 metre tower for the V and V MW turbines weighs only approximately 6 tons, where a similar V80 tower model at the same height weighs around 0 tons. Vestas has reduced total tower weight by approximately 44 tons, thus facilitating more cost effective transport. Vestas OptiSpeed * The V MW and V MW turbines are fitted with OptiSpeed, a system that enables the rotor to operate at variable speed (RPM) and hereby optimises the aerodynamic efficiency of the rotor. OptiSpeed is a further development of the OptiSlip system, which allowed the rotor speed to vary by as much as %. With OptiSpeed, the rotor speed can now vary by up to approximately 60%. OptiSpeed is an efficient solution as the converter only converts the generator rotor energy, which accounts for a small part of the entire energy production of the turbine. The energy generated by the generator rotor is transformed back to the electrical grid by means of the converter. The use of a converter eliminates the need to consume reactive power from the electricical grid. Nevertheless, it is possible to adjust the turbine to supply or consume reactive power, if appropriate. In short: OptiSpeed optimises energy production, especially in modest winds, making it easy to adapt the operation of the turbine to the parameters of the electricity grid. * Vestas OptiSpeed is not available in the USA and Canada.

6 Contacts Subsidiaries Vestas - Danish Wind Technology A/S Smed Sørensens Vej 1 Fax vestas-dwt@vestas.com Vestas - Scandinavian Wind Technology A/S Smed Sørensens Vej 1 Fax vestas-swt@vestas.com Vestas - International Wind Technology A/S Smed Sørensens Vej 1 Fax vestas-int@vestas.com Vestas - American Wind Technology, Inc. 111 SW Columbia Street, Suite 480 Portland, OR 971 USA Tel Fax vestas-awt@vestas-awt.com Vestas Deutschland GmbH Otto-Hahn-Strasse Husum/Nordsee Germany Tel Fax vestas@vestas.de Vestasvind Svenska AB Åkarevägen Falkenberg Sweden Tel Fax info@vestasvind.se Vestas - Nederland Windtechnologie B.V. Dr. Langemeijerweg 1 a Postbus AB Rheden The Netherlands Tel Fax vestas@vestas.nl IWT - Italian Wind Technology S.r.l. Via Ariosto 12 Zona Industriale 740 Taranto Italy Tel Fax vestas@vestas-iwt.it Vestas - Celtic Wind Technology Ltd. P.O. Box 9263 Campbeltown, PA28 6WA, Argyll Scotland Tel Fax v-celtic@vestas.com Sales companies Vestas Hellas Wind Technology S.A. 0, A. Papandreou Ave. 2nd Floor Glyfada, Athens Greece Tel Fax Vestas France SAS Le Millénium Bâtiment A 501, rue Denis Papin Montpellier France Tel Fax vestas-france@vestas.com Vestas - Australian Wind Technology Pty. Ltd. 33 Coventry Street, Southbank Melbourne, Victoria 3006 Australia Tel Fax Beijing Vestas Wind Technology Ltd. 29A2, China Merchants Tower, Jianguo Rd. Chaoyang District Beijing 0022 China Tel: Fax: Vestas - Canadian Wind Technology, Inc. R.R No Concession 5 Kincardine, Ontario N2Z 2X6 Canada Tel Fax Associated company Vestas RRB India Ltd. 189, Sukhdev Vihar New Delhi India Tel Fax vrrb@gndel.global.net.in 09/03 Vestas Wind Systems A/S Smed Sørensens Vej 5 Fax vestas@vestas.com