Table 5.13 Example of volumes of oils and fluids in a typical wind turbine Component


Volume (l) Gearbox


Hydraulic pitch (if used) Coolant systems


Transformer: Yaw and motors


Up to 890 250


Approximately 500 Up to 1,000 Comment


Mobilgear SHC XMP 320 or equivalent ISO 32 biodegradable hydraulic fluid 50% Glycol or water


Biodegradable ester based oil Soap based lithium grease


132. Examples of substances contained in the collector and converter stations are as follows:


 Diesel for the emergency diesel generators (in diesel storage tanks);  Oil for the transformers;  Deionised water for the valves cooling system;  Glycol;  Sewage and grey water;  Lead acid for UPS and batteries;  Engine oil; and  SF6.


133. To avoid discharge of oils to the environment the wind turbines, collector and converter stations would be subject to best-practice design for example with a self- contained bund to collect any possible oil spill. To avoid discharge or spillage of oils it is anticipated that the transformers would be filled for their life and would not need interim oil changes.


5.4.10 Wind Turbine, Offshore Substations and Accommodation Platform Construction Sequence


134. The key stages associated with the installation of the offshore windfarm, which may be conducted simultaneously or consecutively, are likely to be as follows:


 Detailed pre-construction site investigations (e.g. cone penetration tests, boreholes and high resolution geophysics) - these works may be subject to separate license applications;


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 5 Description of the Development Page 31


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