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Offshore Wind Statistics

Commissioned Sites by Developer/Owner

Operator Sites
DONG Energy 14
Vattenfall 7
E.ON 4

Comissioned Sites by turbine manufacturer

Turbine Manufacturer Sites
Siemens Wind Power 18
Vestas Wind Systems 16.83
Bonus Energy 4.83

Installed Capacity by Country

Country MW %
United Kingdom 3,309.2 59.2
Denmark 1,271.05 22.74
Netherlands 246.8 4.42

Installed Capacity by commissioned site

Site MW
London Array 1 630
Greater Gabbard 504
Anholt 399.6

Installed Capacity by Operator

Operator MW %
DONG Energy 2,192.85 39.23
Vattenfall 830.9 14.87
SSE Renewables 514 9.2

Installed Capacity & Number of Turbines by turbine manufacturer

Manufacturer
Model
MW %
Siemens Wind Power
Siemens SWT-3.6-107
Siemens SWT-3.6-120
Siemens SWT-2.3-93
Siemens SWT-2.3-101
Siemens SWT-2.3-82 VS
3,403.5
1,551.6
1,224
575
50.6
2.3
60.89
27.76
21.9
10.29
0.91
0.04
Vestas Wind Systems
Vestas V90-3.0 MW
Vestas V80-2.0 MW
Vestas V39-500 kW
Vestas V66-2.0 MW
Vestas V47-660 kW
1,393.32
957
426
5
4
1.32
24.93
17.12
7.62
0.09
0.07
0.02
Bonus Energy
Bonus 2.3 MW/82
Bonus 2.0 MW/76
Bonus 450 kW/37
245.05
200.1
40
4.95
4.38
3.58
0.72
0.09
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Alpha Ventus Offshore Wind Farm

General Information

Official Name: Alpha Ventus
Alternative Name: Borkum West 1
Development Status: Commissioned
Area of Wind Farm: 4 km2
Number of Rows/Turbines: 4 x 3 turbines
Distance Between Rows/Turbines: 761-817 m / 786-852 m
Location: Borkum Island
Region: Niedersächsen
Country: Germany
Sea Name: North Sea
GPS Latitude: 54.0162
GPS Longitude: 6.6275
Distance From Shore: 45-60 km
Water Depth: 30-45 m

Timeline & Track Records

Project Start: 1999 - Application submitted
2006 (June) - DOTI established
Construction Start: 2007 (August)
First Power Generation: 2009 (August)
Commission Year: 2010 (April)
Developer: Deutsche Offshore Testfeld und Infrastruktur GmbH & Co. KG (DOTI) - owned by EWE (47.5%), E.ON (26.25%), Vattenfall (26.25%)
Installer Turbines: Jack Up Barges - 6 x AREVA M5000-116
GeoSea - 6 x REpower 5M. Part of DEME Group
Installer Substructure: Bugsier Reederei - 6 x tripods
Hochtief - Transition pieces for tripods and lower tower sections for 6 x AREVA M5000-116 turbines
Heerema Marine Contractors (HMC) - 6 x jackets incl. transition pieces
GeoSea - Pre-pilling 6 x jackets (24 piles). Part of DEME Group
Installer Inter-Array Cables: Visser & Smit Marine Contracting (VSMC)
Installer Export Cables: Oceanteam - Cable laying
CTC Marine - Burial. Now DeepOcean
Global Marine Systems - Burial - ROV
Installer Offshore Substation: SMIT - Topside and jacket
Hochtief - Post-pilling OSS jacket (4 piles)
Operator: Stiftung Offshore Windenergie
TSO: TenneT TSO (Germany)
Estimated Project Cost: 250 mio €

Wind & Waves

Average Wind Speed: 10.5 m/s at 90 m
Average Wave Height: 6-8 m

Production & Performance

Total Installed Capacity: 60 MW
Total Number of Turbines: 12
Annual Estimated Production: 220 GWh/year
Annual Production: 267.03 GWh in 2011

Show previous years

190.68 GWh in 2010
37.47 GWh in 2009
Capacity Factor: 50.80 % in 2011

Substations, Inter-Array & Export Cables

Transmission Type: MVAC / HVAC
Operating Voltage Level: 30 kV / 110 kV
Inter-Array Radials: 2 radials with 6 turbines
Inter-Array Cable Type: Norddeutsche Seekabelwerke (NSW) 30 kV
Conductor Size: 3 x 240 mm2
Total Length: 16 km
Burial Depth: 0.6 m
Inter-Array Description: Diameter: 12.5 cm
Transformers: 1 x 75 MVA
Electrical Components Supplier: AREVA T&D - Now Alstom Grid
Support Structure Type: Jacket
Foundation Type: Piled
Offshore Structure Manufacturer: Mostostal - Topside
WeserWind - Jacket
Offshore Structure Designer: IMS Ingenieurgesellschaft - Topside and jacket
Export Cable Type: Prysmian 110 kV XLPE
Conductor Size: 3 x 240 mm2 (Cu)
Total Length: 66 km
Export Cable Description: Diameter: 18 cm
Power Frequency: 50 Hz
Export Cable Landfall: Hilgenrieder Siel (over the island of Norderney), Niedersächsen (Germany)
Onshore Substation Location: Hagermarsch, Niedersächsen (Germany)

Turbine, Tower & Substructure

Turbine:  
Turbine Manufacturer: AREVA Wind
Turbine Model: AREVA M5000-116
Number of Turbines: 6
Rated Power pr. Turbine: 5 MW
Estimated Watt pr. Rotor m2: 473 watt
Design Life: 20 years
Operational:  
Cut-in Wind Speed: 4 m/s
Rated Wind Speed: 12.5 m/s
Cut-out Wind Speed: 25 m/s
Rotor & Hub:  
Rotor Type: 3-bladed, horisontal axis
Rotor Position: Upwind
Rotor Diameter: 116 m
Rotor Area: 10586 m2
Rotor Speed (min): 5.9 rpm
Rotor Speed (rated): 14.8 rpm
Rotor Speed (max): 16.3 rpm
Rotor Weight (incl. hub): 109 t
Hub Height (above MSL): 90 m
Hub Weight: 62 t
Blade Tip Speed (rated): 89.89 m/s
Blade Tip Speed (max): 99.00 m/s
Blade Tip Height (above MSL): 148 m
Weight pr. Blade: 16.5 t
Nacelle:  
Drive Train Type: Medium speed
Gearbox Ratio: 1:10
Generator Type: PMSG
Generator Rated Power: 5260 kW
Generator Rated Speed: 148.5 rpm
Power Converter: Full Scale
Power Converter Location: Tower
Power Frequency: 50 Hz
Transformer Voltage Level: 30 kV
Transformer Location: Tower
Nacelle Weight: 200 t
Top Head Mass: 309 t
Tower:  
Structure Type: Tubular
Structure Material: Steel
Weight: 104 t
Tower Manufacturer: Ambau
Substructure:  
Structure Type: Tripods
Number of Support Structures: 6
Support Structure Material: Steel
Support Structure Description: Height: 45 m. Weight:710 t. The footprint covers an area 255 m2
Foundation Type: Piled
Foundation Structure Description: The tripods are placed on 25-45 m long piles into the seabed
Substructure Main Contractor: AREVA Wind
Substructure Manufacturer: Aker Solutions - 6 x tripods
Sif Group - Piles
Substructure Designer: Offshore Wind Technologie (OWT) - 6 x tripods
Turbine:  
Turbine Manufacturer: REpower Systems
Turbine Model: REpower 5M
Number of Turbines: 6
Rated Power pr. Turbine: 5 MW
Estimated Watt pr. Rotor m2: 401 watt
Wind Class: IEC IB
Design Life: 20 years
Operational:  
Cut-in Wind Speed: 3.5 m/s
Rated Wind Speed: 14 m/s
Cut-out Wind Speed: 30 m/s
Rotor & Hub:  
Rotor Type: 3-bladed, horisontal axis
Rotor Position: Upwind
Rotor Diameter: 126 m
Rotor Area: 12469 m2
Rotor Speed (min): 6.9 rpm
Rotor Speed (rated): 12.1 rpm
Rotor Speed (max): 13.9 rpm
Rotor Weight (incl. hub): 120 t
Hub Height (above MSL): 92 m
Blade Tip Speed (rated): 79.83 m/s
Blade Tip Speed (max): 91.70 m/s
Blade Tip Height (above MSL): 155 m
Power Regulation: (electric)
Nacelle:  
Drive Train Type: High speed
Gearbox Ratio: 1:97
Gearbox Stages: 2 planetary stages, 1 helical stage
Generator Type: DFIG
Generator Rated Power: 5000 kW
Generator Number of Poles: 6 poles
Generator Rated Speed: 1170 rpm
Power Converter: Rotor
Power Converter Location: Nacelle
Power Frequency: 50 Hz
Turbine Voltage Level: 950/660 V
Transformer Voltage Level: 30 kV
Transformer Location: Nacelle
Nacelle Weight: 290 t
Top Head Mass: 410 t
Tower:  
Structure Type: Tubular
Structure Material: Steel
Weight: 210 t
Tower Manufacturer: Ambau
Substructure:  
Structure Type: Jackets
Number of Support Structures: 6
Support Structure Material: Steel
Support Structure Description: Weight: 480 t. Height: 56 m
Foundation Type: Piled
Foundation Structure Description: The foundation depth is 40 m into the seabed
Substructure Main Contractor: REpower Systems
Substructure Manufacturer: Burntisland Fabrications (BiFab) - 6 x jackets
ICH Seasteel - Jacket template
Erndtebrücker Eisenwerk (EEW) - Piles
Substructure Designer: OWEC Tower

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