2. Is bigger really better ?
As turbines continue to increase in size, what are the
limits to up scaling ?
Presentatie EnerVest
06/10/2012
Philippe Vermeulen
General Manager
3. LEGAL NOTE
This presentation contains target figures and forecast data for EnerVest
AG, Munich. The entire information is a non-binding strategy without
warranty. Neither EnerVest AG nor its bodies nor its subsidiaries will accept
any liability for the correctness or the completeness of this information.
Particularly, the aforementioned companies may not be held liable for the
success of forecasted targets.
All information contained in this presentation is strictly confidential. Any
distribution or propagation or otherwise making available of the information
contained to third parties in full or in part requires the prior written
authorization by EnerVest AG, regardless of the form of transmission or the
content.
4. EnerVest global
Who are we?
Founding in 1996 by Hannes Hofer
• 15 experience in wind sector
Domains Developer, owner and operator of
• Wind park
• Photo-Voltaïk park
Active in Germany, Belgium, Sweden, Poland,…..
• Germany: 120 MW in operations (= 55 turbines)
• Belgium: 300 MW in development (40 projects)
5. 05 ENERVEST – DEVELOPMENT PIPELINE
Sweden: expansion 400 MW
UK: expansion 200 MW
Ireland: expansion 200 MW Germany: currently 400
MW
Poland: currently 200
Belgium: currently 300 MW
MW
Turkey: currently
France: currently 100
100 MWatt
MW
Ethiopia: currently 200
MW
6. Elements of selection for turbine sizing
Development site dimensioning
1. Minimum distances to residences
1. Environmental impact of turbines for inhabitants
1. Local legislation minimum distance to urban structures
2. Local legislation maximum noise and shade impact of development
2. Site dependant restrictions
1. Minimum distance from nature zones such as Habitat 2000 zoning
2. Minimum distances from high tension lines and other utility infrastructure
3. Minimum safety distance of turbines to risk area’s such as roads, industrial complexes
4. Minimum distance to aviation radar and meteorological radars
5. Aviation flight sealing
3. Landscape impact of development zone
1. Landscape integration of development
2. Visual impact
10. Elements of selection for turbine sizing
Selecting IEC class for turbine
I II III IV
WTG Class
Vave average wind speed at
hub-height 10.0 8.5 7.5 6.0
(m/s)
V50 extreme 50-year gust
70 59.5 52.5 42.0
(m/s)
I15 characteristic
18%
turbulence Class A
I15 characteristic
16%
turbulence Class B
α wind shear exponent 0.20
Combining available wind data and
standard IEC classification
11. Elements of selection for turbine sizing
Site specific factors
1. Road access
1. Transport of individual parts of the turbine to site
2. Condition of road infrastructure from point of delivery to site
3. Transport to primary point of delivery
4. Cost of additional road infrastructure
2. Icing
3. Topography to and at site
1. Indication of foundation type
Photo courteous
of re-power
2. Access to and from site
4. Grid connection
1. Type of connection
2. Location of connection point
3. Estimated cost of connection
15. Benchmarking ideal turbine for site
1. Combining the results of the three first steps
2. Asses site minimum turbine amount or rated power to be profitable
3. Estimate date of full permit approval and grid connection approval
4. Look at current ready available turbine types at that date
16. Current commercial available turbine types
Nominal Rotor Hub height Number of Cost / Mw OEM
power diameter blades installed contract 15
years / Kwh
+ fixt
amount/turbi
ne
500-750 Kw* 50-65 m 40-50 m 2-3 1.2 M€/Mw 0.0055€cents/
Kwh
1 -1,5 Mw 60- 75 m 60-70 m 3 1 M€/ Mw 0.0045€cents/
Kwh
2-3 Mw 70-114 m 80-100 m 3 0.9 M€/Mw 0.0050€cents/
Kwh
7 Mw ** 126-164 m 105-135 m 3 1.25 M€/Mw 0.0050€cents/
Kwh
•*Turbine type produced for UK market and private use
•** Mainly focused on off-shore deployment
1. Combining all factors currently in most European countries planning is
focused on 2-3 Mw type turbines
2. UK and Ireland and African projects focus on 1-1.5 Mw typr turbines
3. 7 Mw turbines are mostly showcase and single project developments
17. Balancing number of turbines on development site
Using small turbines on site
Negative factors
Positive factors
• Easier transport to site • Higher visibility impact on landscape
• Smaller fall out rate • Cumulative effect of noise and shadow
• Easier active balancing • Higher cost of infrastructure
• Lower hub height
• Higher probability of grid effects
• Proven technology
• Higher cost/Mw installed
• OEM contracts on 15 years ‘standard’
• OEM cost higher / Mw installed
• Risk assessment at Financing on base ‘proven’
technology • Lower park efficiency due to wake loss
18. Balancing number of turbines on development site
Using commercial benchmark turbines on site
Positive factors Negative factors
• Lower impact on landscape • Possible problems of transport to site
• Cumulative effect of noise and shadow • Higher fall out rate / Mw installed
• Balanced cost of infrastructure /Mw installed • Easier active balancing
• Lower probability of grid effects • Higher hub height
• Balanced cost/Mw installed • Proven technology
• Lower OEM / Mw installed • More production balancing due to source noise and
shadow issues
• OEM contracts on 10 years ‘standard’
• Better park efficiency
