145. The design and specifications of a TP are dependent on the type of foundation on which they sit. For jackets and gravity base structure foundations the TP is often integrated with the foundation at fabrication stage, and therefore there is no additional installation process. For monopiles however a TP cannot be located on the foundation as the top side needs to be clear to allow it to be driven into the sea bed.


146. Once the TPs are in place the turbine tower would be lowered into place using a heavy lift vessel


5.4.10.4 Installation of wind turbines 147. The nacelle and turbine blades would be either be both transported to site and installed by the installation vessel or transported on a barge where they would be lifted off and installed by crane on a separate installation vessel. The installation of the wind turbines would typically involve multiple lifting operations, with up to three tower sections erected, followed by the nacelle with pre-assembled hub, and then the blades.


148. Plate 5.2 shows an example of a wind turbine under construction, TP tower, nacelle and two blades have been installed and only the third remaining blade requires installation


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 5 Description of the Development Page 34


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