UK Offshore Wind 2002
17th April 2002
Gunfleet Sands- A Progress Report
Presented by
Nigel Crowe
Enron Wind
Where are we today ?Where are we today ?
•Planning
•Financing
•Construction
•Operation
PlanningPlanning
•Hydrosearch Associates Ltd. have been engagedto project manage the Environmental ImpactAssessment process
•Draft Environmental Impact Statement(EIS) to be circulated to all consultees forcomments around May/June 2002
Environmental ImpactAssessmentEnvironmental ImpactAssessment
•Geophysical Survey
•Environmental Survey
•Bird & Marine Mammal Survey
•MetOcean Data Acquisition
•Coastal Processes Model
•Collision Risk Assessment Study
•Commercial Fisheries Study
•Other Studies in progress
GEOPHYSICAL SURVEY
•Completed October 2001 by Titan Environmental SurveysLtd.
•Equipment utilised included Echosounder, Side Scan Sonar,Tow Boomer, Magnetometer
•Parameters measured for licence area and cable route:- detailed bathymetry- seabed features & magnetometer contacts- shallow geology- shallow gas- sub-bottom geological profiles- isopachyte (seabed to base sands contours)
Environmental Survey
Sea based observations and aerial transects
15 day surveys have been completed to date with monitoringplanned after installation of turbines
GPS referenced transects
Bird & Marine Mammal Survey
Metocean Data Acquisition
2 MetOcean Instruments mounted in seabed frames with surfaceDan buoys in water depths of approx. 12m
Parameters to be measured include:- Current velocity- Tidal height- Directional wave parameters- Turbidity
Instrumentation has been calibrated with Water Samples
Deployed by Thales Geosolutions on 17 January 2002 for 6 monthduration
Service visits every 2 months
Data to feed into Coastal Processes Model, Design Layout &Foundation Design
Coastal Processes Model
ABP Research are assessing the baseline coastalprocesses
Then potential impacts of the development can bequantified over the life of the development
Model will include tides, waves, currents, sedimentmobility beyond 1 tidal excursion of the licence area
Utilisation of Remotely Sensed Imagery
Collision Risk Assessment Study
99% of traffic passesat least 3.7 nm fromdevelopment area
Collision risk assessedfor powered anddrifting vessels
Highest risk aroundNE corner - collisionreturn period of34,013 years.
Commercial Fisheries Study
In consultation with localfishermen, study has identified:
• Ports, Fishing Associations &Individual Fishermen
• Fish species
• Fishing methods
• Importance of Gunfleet Sands
• Sensitivities through the year
• Spawning grounds
Commercial Fisheries Study
Most important species include:
• Sole (main summer + autumn)
• Bass (important summer +autumn)
• Cod (normally main winter species)
• Thornback (caught all year)
• Grey Mullet (inshore - summer)
• Whiting
Marine Archaeology
Landscape & Seascape Assessment
Radar Interference Assessment
Terrestrial Ecology along the cable route
Socio Economic Study
Noise Study
Comprehensive Consultation Exercise with Open Days in Clacton
Web site
Other Studies In Progress
Financing
Primary objective at present to ensurebankability of Project
• NFFO 4 for 30 MW of total 108MW
•Watertight PPA agreement for remainderof off take
• Reliable Wind Data –
• Initial data from Gunfleet Lighthouse
• Considered onshore data tosupplement this but decided on offshoremetmast to avoid any uncertainty
• 60m lattice mast founded on a 32mmonopile with measurements taken at 3levels with GPS data collection
60m Met Mast
Construction
• 30 no. EW 3.6MW Turbines – 100m rotordiameter, 70-90m tower giving 108MW
• Integrated Foundation Solution
•Connection 10Km (7km offshore, 3km Onshore)at 132Kv to Holland–on–Sea
EW 3.x platform= Onshore: EW 3.2s
+ Offshore: EW 3.6
EW 3.2s
EW 3.6
Rotor
Power
Site
Ø 104 m
3.2 MW
onshore
Ø 100 m
3.6 MW
offshore
Vrated
Rot. speed
Hub height
14.3 m/s
8.1 – 13.5 rpm
100 – 140 m
15 m/s
9.2 –15.3 rpm
site specific: > 70 m
Design
class
IEC II-A
DIBt WZ III / II (HH 100 / 140 m)
IEC I-A
T.top mass
240 t
268 t
Tip speed
Noise
73.5 m/s
< 106 dB(A), red. 104 dB(A)
80.1 m/s
109 dB(A)
EW 3.6 offshore
Proven elements
concept analogous to morethan 880 EW 1.5 since1996
separated drive train
variable-speed,
variable-pitch
double-fed asynchronousgenerator
frequency converter
recommended suppliers
New elements
experience EW 1.5
offshore at Utgrunden
annual maintenance
over-specified design
crane system
E-container at nacelle
3.3 kV generator
external heat exchanger
helicopter hoistingplatform (optional)
Layout EW 3.x: Separated drive train & crane system
14 m
4.5 m
Testing & pre-commissioning at factory
Prototype EW 3.6: 100 m hybrid tower in Spain
Barrax site, close to Madrid
Transport restrictions
prototype for inland sites
and hub height up to 140 m
70 m pre-stressed concrete
plus 26.5 m steel segment
Transport of rotor blades EW 3.6
Transport of rotor blades EW 3.6
Transport of rotor blades EW 3.6
Operation
Efficient Operation is critical to financial viability
Reliability, Availability,Maintainability, Serviceability
•proven technology (see EW 1.5)
•next offshore generation:
i.e. new offshore design
rather than marinised MW-class
•larger & proven turbines
lower O&M costs
40 t slewing crane
(activated on-demand)
- container
- generator
- gear box
- main shaft
- hub
- blades
2 t gantry crane
(hoisting inside andoutside nacelle)
Enron Wind 3.x: Internal crane system capableof all main components
Gunfleet Sands ProgressSummaryGunfleet Sands ProgressSummary
•Environmental Impact Assessment approachingcompletion
•Comprehensive consultation process underway
•Data collection being taken seriously to inhancefunding opportunities
•Construction programme is underway now withexcellent progress being made with the EW3.6
•Operation and maintenance strategy being consideredupfront and given necessary importance