Private-private partnership for the future turbine technology REpower 3.2M114 Michael Baranowski EWEA ( Copenhagen) 17. April 2012

2 Agenda REpower 3MW Portfolio – We like to enter the sky Hybrid tower concept – experiences from other industries Outlook - bigger, higher - more efficiency

33 Optimized energy yield for all wind conditions IEC Ia IEC IIa IEC IIIa HH: 100m HH: 128mHH: 80m, 100mHH: 93m, 80m (IEC Ib) HH: 143m, 123m, 93m v [m/s] HH: 100m HH: 69m, 80m, 100m HH: 59m, 69m, 80m HH: 100m

4 Higher Hub Heights 104 m 114 m 128 m 143 m 123 m 57 m 65 m 53 m 55 m 83 m 180 m 200 m

5 Making Low Wind Speed Sites Profitable 93m123m143m High hub heights can contribute to achieve high energy yield even at very low wind speed sites +34% +51% +17% Source: summary of REpower wind speed measurements Energy yield increase with height (~5.4m/s HH 80m)

6 Agenda REpower 3MW Portfolio – We like to enter the sky Hybrid tower concept – experiences from other industries Outlook - bigger, higher - more efficiency

7 Hybrid Tower concept (Steel-Concrete-Tower)

8 Characteristics of the Hybrid Tower Structure  Ring elements are subdivided into two halves at maximum  only few vertical grouted joints on site  Horizontal joints between ring elements are not grouted  clean and fast piling  External tendons  easy dismantling at the end of the WTG´s lifetime  Bottom flange of steel tower is an internal L-Flange  easy assembly from inside of the tower only  Small offset at the outer edges of concrete and steel tower  good appearance – looks like a single solid structure Hybrid Tower concept (Steel-Concrete-Tower)

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10 Hybrid Tower concept (Steel-Concrete-Tower)

11 Hybridtower concept (Steel-Concrete-Tower)

12 Hybridtower concept (Steel-Concrete-Tower)

13 Agenda REpower 3MW Portfolio – We like to enter the sky Hybrid tower concept – experiences from other industries Outlook - bigger, higher - more efficiency

14 Installation Concept for 143m Company confidential  For sites in hilly and forest areas, where lattice boom cannot be installed.  Less Deforest at forest areas (economies of space ca. 150m x 6m = 900m²)  Fewer transports for crane installation  Fewer transports for crane installation are subject to approval by police (standard width and height of crane sections).  Smaller crane space required (approx. 1000m² vs. 1500m²)  Crane only ~ 300t (lattice crane ~ 1.000t)  Installation up to 15 m/s (Lattice boom crane up to 12 m/s), better planning for Installation Tower Crane instead of Lattice boom Crane

15 Total installation of crane for Steeltower, Nacelle, Hub and Blades Installation Concept for 143m Company confidential Tower Crane for all Components

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