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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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Kentish Flats 1 Offshore Wind Farm

General Information

Official Name: Kentish Flats 1
Development Status: Commissioned
Area of Wind Farm: 10 km2
Number of Rows/Turbines: 5 x 6 turbines
Distance Between Rows/Turbines: 700 m / 700 m
Location: Whitstable
Region: Kent
Country: United Kingdom
Sea Name: North Sea
GPS Latitude: 51.4616
GPS Longitude: 1.0933
Distance From Shore: 8.5-13 km
Water Depth: 5 m
Generel Note: Round 1 site

Timeline & Track Records

Project Start: 2002 (August) - Application submitted
Construction Start: 2003 (March) - Project consented
First Power Generation: 2004 (August)
Commission Year: 2005 (June)
Developer: Elsam
Installer Turbines: A2SEA
Installer Substructure: MPI Offshore - Monopiles and transition pieces
Peter Madsen Rederi - J-tubes
Installer Inter-Array Cables: Global Marine Systems
Installer Export Cables: Global Marine Systems
Operator: Vattenfall
TSO: National Grid
Estimated Project Cost: 122 mio €

Wind & Waves

Average Wind Speed: 8.7 m/s at 70 m

Production & Performance

Total Installed Capacity: 90 MW
Total Number of Turbines: 30
Annual Estimated Production: 280 GWh/year
Annual Production: 257.25 GWh in 2012

Show previous years

273.88 GWh in 2011
244.10 GWh in 2010
232.49 GWh in 2009
265.12 GWh in 2008
196.85 GWh in 2007
Capacity Factor: 32.63 % in 2012

Show previous years

34.74 % in 2011
30.96 % in 2010
29.49 % in 2009
33.63 % in 2008
24.97 % in 2007

Substations, Inter-Array & Export Cables

Transmission Type: MVAC / HVAC
Operating Voltage Level: 33 kV / 132 kV
Inter-Array Radials: 3 radials with 10 turbines
Inter-Array Cable Type: AEI Cables 33 kV PEX
Conductor Size: 3 x 185 mm2 (Cu)
Length: 22.8 km
Export Cable Type: 3 x AEI Cables 33 kV PEX
Conductor Size: 3 x 500 mm2 (Cu)
Length: 28.2 km
Export Cable Description: Three blocks of 10 x Vestas V90-3.0 are connected infield and to the onshore substation
Power Frequency: 50 Hz
Export Cable Landfall: Hampton Pier car park, Kent (United Kingdom)
Onshore Substation Location: Herne Bay, Kent (United Kingdom)

Turbine, Tower & Substructure

Turbine:  
Turbine Manufacturer: Vestas Wind Systems
Turbine Model: Vestas V90-3.0 MW
Number of Turbines: 30
Rated Power pr. Turbine: 3 MW
Estimated Watt pr. Rotor m2: 472 watt
Wind Class: IEC IA
Design Life: 20 years
Operational:  
Cut-in Wind Speed: 3.5 m/s
Rated Wind Speed: 14 m/s
Cut-out Wind Speed: 25 m/s
Rotor & Hub:  
Rotor Type: 3-bladed, horisontal axis
Rotor Position: Upwind
Rotor Diameter: 90 m
Rotor Area: 6362 m2
Rotor Speed (min): 8.6 rpm
Rotor Speed (rated): 16.1 rpm
Rotor Speed (max): 18.4 rpm
Rotor Weight (incl. hub): 39.8 t
Hub Height (above MSL): 70 m
Blade Tip Speed (rated): 75.87 m/s
Blade Tip Speed (max): 86.71 m/s
Blade Length: 44 m
Blade Max Chord (max width): 3.5 m
Weight pr. Blade: 6.6 t
Power Regulation: Pitch regulated with variable speed (hydraulic)
Nacelle:  
Drive Train Type: High speed
Gearbox Ratio: 1:104
Gearbox Stages: 2 planetary stages, 1 helical stage
Generator Type: DFIG
Generator Rated Power: 3000 kW
Generator Number of Poles: 4 poles
Power Converter: Rotor
Power Converter Location: Nacelle
Power Frequency: 50 Hz
Turbine Voltage Level: 1000/400 V
Transformer Voltage Level: 33 kV
Transformer Location: Nacelle
Yaw Gears - Number: 6
Dimensions of Nacelle:  
Length: 9.65 m
Width: 3.85 m
Height: 4 m
Nacelle Weight: 68 t
Top Head Mass: 107.8 t
Tower:  
Structure Type: Tubular
Structure Material: Steel
Weight: 108 t
Substructure:  
Structure Type: Monopiles
Number of Support Structures: 30
Support Structure Material: Steel
Support Structure Description: Diameter: around 4 m. Thickness: 4.5 cm. Weight: 247-292 t. Length: 38-44 m
Foundation Type: Piled
Foundation Structure Description: The monopiles are driven between 28-34 m into the seabed
Geotechnical Description: The seabed consists of layers of sand and not very dense clay
Substructure Main Contractor: MT Højgaard
Substructure Manufacturer: Sif Group - Monopiles and transition pieces
Smulders - Monopiles and transition pieces
Substructure Designer: Rambøll

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