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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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Gunfleet Sands Offshore Wind Farm

General Information

Official Name: Gunfleet Sands
Alternative Name: Gunfleet Sands 1+2
Development Status: Commissioned
Area of Wind Farm: 17.5 km2
Number of Rows/Turbines: 5 x 6 turbines, 2 x 9 turbines
Distance Between Rows/Turbines: 435 m / 890 m, 435 m / 890 m
Location: Clacton-on-Sea
Region: East England
Country: United Kingdom
Sea Name: North Sea
GPS Latitude: 51.7298
GPS Longitude: 1.2383
Distance From Shore: 7 km
Water Depth: 0-15 m
Generel Note: Round 1-site (phase 1) and Round 2-site (extension - phase 2)

Timeline & Track Records

Project Start: 2002 - Anemometry mast installed
2004 - Phase 1 consented
2006 (June) - Phase 2 application submitted
2008 (March) - Phase 2 consented
Construction Start: 2008 (April) - Offshore construction started for both phases
First Power Generation: 2009 (August)
Commission Year: 2010 (June)
Developer: Gunfleet Sands - owned by , DONG Energy (50.1%), Marubeni (49.9%)
Installer Turbines: A2SEA - Installed 19/48 turbines
KS Energy Services - Installed 29/48 turbines
Installer Substructure: Fugro Seacore - Installed 20/48 monopiles and transition pieces
Ballast Nedam - Installed 28/48 monopiles and transition pieces
Red7Marine - J-tubes
Installer Inter-Array Cables: CT Offshore - Installed 31 km array cabling
Oceanteam - Installed 5 km array cabling
Installer Export Cables: Visser & Smit Marine Contracting (VSMC)
Installer Offshore Substation: Scaldis Salvage & Marine Contractors - Topside
Ballast Nedam - Monopile and transition piece
Operator: DONG Energy
TSO: National Grid

Wind & Waves

Average Wind Speed: 9 m/s at 80 m

Production & Performance

Total Installed Capacity: 172.8 MW
Total Number of Turbines: 48
Annual Estimated Production: 570 GWh/year
Annual Production: 521.98 GWh in 2012

Show previous years

497.03 GWh in 2011
458.34 GWh in 2010
69.60 GWh in 2009
Capacity Factor: 34.48 % in 2012

Show previous years

31.65 % in 2011

Substations, Inter-Array & Export Cables

Transmission Type: MVAC / HVAC
Operating Voltage Level: 33 kV / 132 kV
Inter-Array Radials: 4 radials with 10 turbines / 1 radial with 8 turbines
Inter-Array Cable Type: Prysmian 33 kV / Prysmian 33 kV
Conductor Size: 3 x 150 mm2 / 3 x 500 mm2
Total Length: 36 km
Electrical Components Supplier: AREVA T&D - Now Alstom Grid
ABB
Support Structure Type: Monopile
Foundation Type: Piled
Offshore Structure Manufacturer: Bladt Industries - Topside and foundation
Offshore Substation Description The OSS has 4 decks. Height: 39 m above sea level. Dimensions: 20x30 m. Weight: 1300 t
Export Cable Type: Prysmian 132 kV XLPE
Conductor Size: 3 x 800 mm2
Total Length: 8.5 km
Burial Depth: 2 m
Power Frequency: 50 Hz
Export Cable Landfall: Holland Heaven, East England (United Kingdom)
Onshore Substation Location: Cooks Green, East England (United Kingdom)
Onshore Substation Description: The transmission assets relating to Gunfleet Sands I and II was purchased by TC Gunfleet Sands OFTO Limited (Transmission Capital Partners) in 2011.

Turbine, Tower & Substructure

Turbine:  
Turbine Manufacturer: Siemens Wind Power
Turbine Model: Siemens SWT-3.6-107
Number of Turbines: 48
Rated Power pr. Turbine: 3.6 MW
Estimated Watt pr. Rotor m2: 400 watt
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): 75.5 m
Blade Tip Speed (rated): 72.83 m/s
Blade Tip Height (above MSL): 129 m
Blade Length: 52 m
Blade Root Chord (root diameter): 4.2 m
Blade Tip Chord: 1.0 m
Weight pr. Blade: 15.9 t
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
Turbine Voltage Level: 690 V
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: 193 m
Substructure:  
Structure Type: Monopiles
Number of Support Structures: 48
Support Structure Material: Steel
Transition Piece Structure Description: Length: 23 m. Weight: 230 t
Support Structure Description: Diameter: 5 m. Length: up to 50 m. Weight: 225-423 t
Foundation Type: Piled
Foundation Structure Description: The monopiles has been driven 27-38 m into the seabed
Scour Protection: A layer of gravel and rocks has been used to protect the foundations from erosion
Substructure Main Contractor: MT Højgaard
Substructure Manufacturer: Sif Group (http://www.sif-group.com )
Smulders - Monopiles and transition pieces
Substructure Designer: Rambøll

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