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 IaIEC IIaIEC IIIa

HH: 100m

HH: 128m HH: 80m, 100m HH: 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 m114 m

114 m12

8 m 14

3 m

123

m

57 m

65 m

65 m

53 m

55 m

83 m

180 m 180 m

200 m

5

0

2.000

4.000

6.000

8.000

10.000

12.000

93 123 143 Hub height [m]

En

erg

y yi

eld

[MW

h /

yea

r]Making Low Wind Speed Sites Profitable

93m123m

143m

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)

9

Hybrid Tower concept (Steel-Concrete-Tower)

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 143mCompany 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 Total installation of crane for Steeltower, Nacelle, Hub and Blades

Installation Concept for 143mCompany confidential

Tower Crane for all ComponentsTower Crane for all Components

16

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