UK Offshore Wind 2002
17th April 2002
Gunfleet Sands- A Progress Report
Presented byNigel Crowe
Enron Wind
Where are we today ?Where are we today ?
•Planning •Financing•Construction•Operation
PlanningPlanning
•Hydrosearch Associates Ltd. have been engaged to project manage the Environmental Impact Assessment process
•Draft Environmental Impact Statement (EIS) to be circulated to all consultees for comments around May/June 2002
Environmental Impact Environmental Impact AssessmentAssessment
•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 Surveys Ltd.
•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 monitoring planned after installation of turbines
GPS referenced transects
Bird & Marine Mammal Survey
Metocean Data Acquisition
2 MetOcean Instruments mounted in seabed frames with surface Dan 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 month duration
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 coastal processes
Then potential impacts of the development can be quantified over the life of the development
Model will include tides, waves, currents, sediment mobility beyond 1 tidal excursion of the licence area
Utilisation of Remotely Sensed Imagery
Collision Risk Assessment Study
99% of traffic passes at least 3.7 nm from development area
Collision risk assessed for powered and drifting vessels
Highest risk around NE corner - collision return period of 34,013 years.
Commercial Fisheries Study
In consultation with local fishermen, 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
FinancingPrimary objective at present to ensure bankability of Project• NFFO 4 for 30 MW of total 108MW•Watertight PPA agreement for remainder of off take • Reliable Wind Data –
• Initial data from Gunfleet Lighthouse• Considered onshore data to supplement this but decided on offshore metmast to avoid any uncertainty• 60m lattice mast founded on a 32m monopile with measurements taken at 3 levels with GPS data collection
60m Met Mast
Construction• 30 no. EW 3.6MW Turbines – 100m rotor diameter, 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
RotorPowerSite
Ø 104 m3.2 MWonshore
Ø 100 m3.6 MWoffshore
VratedRot. speedHub height
14.3 m/s8.1 – 13.5 rpm100 – 140 m
15 m/s9.2 –15.3 rpmsite specific: > 70 m
Design class
IEC II-ADIBt WZ III / II (HH 100 / 140 m)
IEC I-A
T.top mass 240 t 268 t
Tip speedNoise
73.5 m/s< 106 dB(A), red. 104 dB(A)
80.1 m/s109 dB(A)
EW 3.6 offshore
Proven elements
concept analogous to more than 880 EW 1.5 since 1996
separated drive train variable-speed,
variable-pitch double-fed
asynchronous generator
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 hoisting
platform (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 concreteplus 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 and outside nacelle)
Enron Wind 3.x: Internal crane system capable of all main components
Gunfleet Sands Progress Gunfleet Sands Progress SummarySummary
•Environmental Impact Assessment approaching completion•Comprehensive consultation process underway•Data collection being taken seriously to inhance funding opportunities •Construction programme is underway now with excellent progress being made with the EW3.6•Operation and maintenance strategy being considered upfront and given necessary importance
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