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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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Greater Gabbard Offshore Wind Farm

General Information

Official Name: Greater Gabbard
Development Status: Commissioned
Area of Wind Farm: 147 km2
Layout Description: The wind farm consists of two sections: Inner Gabbard and Galloper sandbanks
Location: Sizewell
Region: Suffolk
Country: United Kingdom
Sea Name: North Sea
GPS Latitude: 51.8836
GPS Longitude: 1.9354
Distance From Shore: 26 km
Water Depth: 24-34 m
Tidal Range: 0.2-4.2 m
min/max: 6-16.5 °C
Generel Note: Round 2 site. Greater Gabbard consists of two arrays of wind turbines and associated infrastructure adjacent to two shallow sandbanks known as the Inner Gabbard (112 km2) and The Galloper (35 km2)

Timeline & Track Records

Project Start: 2005 (October) - Application submitted
2007 (February) - Project consented
Construction Start: 2009 (September) - Foundations
First Power Generation: 2011 (March)
Commission Year: 2012
Developer: Greater Gabbard Offshore Wind (GGOWL) - owned by RWE npower renewables (50%), SSE Renewables (50%)
Installer Turbines: A2SEA
Seajacks
Installer Substructure: Seaway Heavy Lifting - Monopiles
Jumbo - Transition pieces
Red7Marine - J-tubes
Installer Inter-Array Cables: Subocean - Now Technip
Offshore Marine Management (OMM)
Technocean
Red7Marine
Installer Export Cables: Subocean - Now Technip
Installer Offshore Substation: Seaway Heavy Lifting - 2 x topsides and 2 x jackets
Operator: SSE Renewables
TSO: National Grid
Estimated Project Cost: 1615.25 mio €

Wind & Waves

Average Wind Speed: 9.0 m/s at 80 m
Average Wave Height: 3.6 m
Wave Height - Significant: 6.2 m

Production & Performance

Total Installed Capacity: 504 MW
Total Number of Turbines: 140
Annual Estimated Production: 1749 GWh/year
Annual Production: 1195.15 GWh in 2012
Capacity Factor: 27.07 % in 2012

Substations, Inter-Array & Export Cables

Transmission Type: MVAC / HVAC / HVAC
Operating Voltage Level: 33 kV / 132 kV / 400 kV
Inter-Array Radials: 1 radial with 18 turbines / 1 radial with 16 turbines / 1 radial with 15 turbines / 2 radials with 14 turbines / 3 radials with 11 turbines / 3 radials with 10 turbines
Inter-Array Cable Type: JDR Cables 36 kV XLPE
Conductor Size: 3 x 240 mm2 (Cu)
Total Length: 172 km
Offshore Substations: 2
Transformers: 3 x 180 MVA / 2 x 90 MVA
Electrical Components Supplier: Siemens Transmission and Distribution
Support Structure Type: Jackets
Foundation Type: Piled
Offshore Structure Manufacturer: Burntisland Fabrications (BiFab) - 1x topside
Heerema - 1 x topside
Burtisland Fabrications (BiFab) - Jackets
Offshore Structure Designer: Atkins - Topside
McNulty Offshore - Topside
Rambøll - Jackets
Offshore Substation Description The two offshore substations are installed repectively in the Inner Gabbard (2130 t topside) and Galloper (1650 t topside) sandbanks of the wind farm
Export Cable Type: 3 x Prysmian 132 kV XLPE
Conductor Size: 3 x 800 mm2
Total Length: 175 km
Power Frequency: 50 Hz
Export Cable Landfall: Sizewell beach, Suffolk (United Kingdom)
Onshore Substation Location: Sizewell, near Leiston, Suffolk (United Kingdom)

Turbine, Tower & Substructure

Turbine:  
Turbine Manufacturer: Siemens Wind Power
Turbine Model: Siemens SWT-3.6-107
Number of Turbines: 140
Rated Power pr. Turbine: 3.6 MW
Estimated Watt pr. Rotor m2: 400 watt
Design Life: 25 years
Operational:  
Cut-in Wind Speed: 4 m/s
Rated Wind Speed: 13.5 m/s
Cut-out Wind Speed: 25 m/s
Power Curve Data:

Show power curve data

25.0 m/s - 3600 KW
24.0 m/s - 3600 KW
23.0 m/s - 3600 KW
22.0 m/s - 3600 KW
21.0 m/s - 3600 KW
20.0 m/s - 3600 KW
19.0 m/s - 3600 KW
18.0 m/s - 3600 KW
17.0 m/s - 3600 KW
16.0 m/s - 3600 KW
15.0 m/s - 3600 KW
14.0 m/s - 3600 KW
13.0 m/s - 3591 KW
12.0 m/s - 3488 KW
11.0 m/s - 3082 KW
10.0 m/s - 2432 KW
9.0 m/s - 1778 KW
8.0 m/s - 1243 KW
7.0 m/s - 824 KW
6.0 m/s - 507 KW
5.0 m/s - 276 KW
4.0 m/s - 131 KW
3.0 m/s - 0 KW
2.0 m/s - 0 KW
1.0 m/s - 0 KW
0.0 m/s - 0 KW
Rotor & Hub:  
Rotor Type: 3-bladed, horisontal axis
Rotor Position: Upwind
Rotor Diameter: 107 m
Rotor Area: 8992 m2
Rotor Speed (min): 5 rpm
Rotor Speed (rated): 13 rpm
Rotor Weight (incl. hub): 92.5 t
Hub Height (above MSL): 77.5 m
Blade Tip Speed (rated): 72.83 m/s
Blade Tip Height (above MSL): 131 m
Blade Length: 52 m
Blade Root Chord (root diameter): 4.2 m
Blade Tip Chord: 1.0 m
Power Regulation: Pitch regulated with variable speed (hydraulic)
Blade Model - Name: B52
Nacelle:  
Drive Train Type: High speed
Main Bearing: Spherical roller bearing
Gearbox Ratio: 1:119
Gearbox Stages: 3 planetary stages, 1 helical stage
Gearbox Lubrication: Forced lubrication
Generator Type: Asynchronous
Generator Rated Power: 3600 kW
Generator Number of Poles: 4 poles
Power Converter: Full scale
Power Converter Location: Nacelle
Power Frequency: 50 Hz
Transformer Voltage Level: 33 kV
Transformer Location: Tower
Yaw Gears - Number: 6
Nacelle Weight: 142 t
Top Head Mass: 234.5 t
Tower:  
Structure Type: Tubular
Structure Material: Steel
Height: 57 m
Weight: 250 t
Tower Designer: Rambøll (http://www.ramboll.com/)
Substructure:  
Structure Type: Monopiles
Number of Support Structures: 140
Support Structure Material: Steel
Transition Piece Structure Description: Weight: 300 t
Support Structure Description: Length: 60 m. Weight: 700 t
Foundation Type: Piled
Foundation Structure Description: The monopiles are driven 30 m into seabed
Scour Protection: A layer of rock, gravel or frond is used
Substructure Manufacturer: Shanghai Zhenhua Heavy Industry (ZPMC) - Monopiles and transition pieces
Substructure Designer: Rambøll - Monopiles and transition pieces

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