8.1 Offshore Illustrative Drawings

Navitus Bay Development LimitedVersion 1.0

navitusbaywindpark.co.uk

OTHER DOCUMENTS

OFFSHORE ILLUSTRATIVE DRAWINGS

DOCUMENT 8.1

APRIL 2014

Pursuant to Regulations 5(2)(q) of the Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009

NAVITUS BAY WIND PARK

Navitus Bay Wind Park

DCO

Page ii Offshore Illustrative Drawings

DOCUMENT CONTROL

DOCUMENT PROPERTIES

Author Navitus Bay Development Limited

Title Offshore Illustrative Drawings

Document Reference

8.1

VERSION HISTORY

Date Version Status Description/Changes

10 April 2014 1.0 Final Issued for application submission


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Offshore Illustrative Drawings Page iii

TABLE OF CONTENTS

1. Purpose of this Document ........................................................ 1

1.1 Introduction ........................................................................... 1

1.2 Wind Turbine Generator ........................................................... 2

1.3 Monopile Foundation ............................................................... 5

1.4 Gravity Base Foundation .......................................................... 7

1.5 Space Frame Foundation .......................................................... 9

1.6 Offshore Substation Platform .................................................. 12

1.7 Inter Array Cable .................................................................. 15

1.8 Export Cables ....................................................................... 17

1.9 Meteorological Mast ............................................................... 19


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Page iv Offshore Illustrative Drawings

LIST OF FIGURES

Figure 1.1 - Indicative turbine classes Image not to scale .......................... 4

Figure 1.2 - Illustration of a monopile foundation ......................................... 6

Figure 1.3 - Illustration of a gravity base foundation .................................... 8

Figure 1.4 - Illustration of a space frame foundation .................................. 11

Figure 1.5 - Offshore substation platform at Prinses Amaliawindpark, The

Netherlands ........................................................................ 13

Figure 1.6 - Example of an installation of an Offshore Substation Platform

by a Sheer Leg .................................................................... 14

Figure 1.7 - An inter array cable .............................................................. 16

Figure 1.8 - Cross-section on an export cable ............................................ 18

Figure 1.9 A picture of a meteorological mast structure ........................... 20

Figure 1.10 - Diagram of an offshore wind farm ......................................... 21

Figure 1.11 - Offshore process in the development, installation and

operation of a Round 3 wind farm .......................................... 22


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Offshore Illustrative Drawings Page 1

1. Purpose of this Document

1.1 Introduction

1.1.1 This document contains illustrations, drawings, photographs and

images associated with the proposed offshore elements of the

Navitus Bay Wind Park (the Project). These are provided as

additional information to support the Project application to the

Planning Inspectorate (PINS) for a Development Consent Order

(DCO).

1.1.2 The final layout and design of the Project cannot be fixed until

the final optimisation and design process has been completed

post-consent. Therefore for this reason, the consent applied for

contains a range of design flexibility, limited by the parameters

set out in the draft DCO (Document 3.1). The need for this

flexibility is set out in Volume B, Chapter 2 Offshore Project

Description of the Environmental Statement (ES) (Document

6.1).

1.1.3 The illustrative information included in this document is intended

to assist in understanding how the form of the development

might appear taking account of the offshore parameters set out

in the draft DCO and the range of flexibility described in more

detail in Volume B, Chapter 2 of the ES. Specifically, this

document contains the following illustrative information:

illustration of a 5MW turbine class;

illustration of a 6MW turbine class;

illustration of an 8MW turbine class;

illustration of a monopile foundation;

illustration of a gravity base foundation;

illustration of a space frame foundation;

picture of the offshore substation platform at Prinses

Amaliawindpark, The Netherlands;

example of an installation of an offshore substation platform;


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Page 2 Offshore Illustrative Drawings

inter-array cables;

export cables;

picture of a meteorological mast structure;

diagram of an offshore wind farm (Figure 1.10); and

illustrative offshore process in the development, installation

and operation of a Round 3 wind farm (Figure 1.11).

1.1.4 It should be noted that the final form of the development may

vary from the illustrations contained herein, within the limits set

out by the draft DCO, and as such the enclosed information

should be referred to as illustrative only.

1.1.5 The illustrations enclosed are not intended to qualify as plans

under the definitions set out by the Applications (Prescribed

Forms and Procedures) Regulations 2009, Regulation 5(2) and as

such do not need to comply with the requirements of Regulation

5(3) with regard to scaling. Note the illustrations included in this

document are not drawn to scale (although some of the

illustrative sections show relevant dimensions).

1.2 Wind Turbine Generator

1.2.1 Indicative wind turbine classes are shown in Figure 1.1.

1.2.2 The following definition for the wind turbine generator (WTG) is

included in the draft DCO:

"wind turbine generator" or "WTG" means a structure

comprising a tower, rotor with three horizontal axis blades

connected at the hub, nacelle containing mechanical and

electrical equipment, ancillary equipment including

access ladders and platforms, lifts, cables, corrosion

protection systems, maintenance equipment, helihoist

facilities and other associated equipment, fixed to a

foundation.

1.2.3 The parameters for the WTG in the draft DCO are as follows:

a) Subject to paragraph (2), no wind turbine generator forming

part of the authorised development may


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i. exceed a height of 200 metres when measured from LAT

to the tip of the vertical blade;

ii. exceed a height of 112 metres when measured from LAT

to the height of the centreline of the generator shaft

forming part of the hub;

iii. exceed a rotor diameter of 176 metres;

iv. be less than 756 metres from the nearest WTG in either

direction perpendicular to the approximate prevailing

wind direction (crosswind) or be less than 1,008 metres

from the nearest WTG in either direction which is in line

with the approximate prevailing wind direction

(downwind); and

v. have a distance of less than 22 metres between the

lowest point of the rotating blade of the wind turbine and

mean high water spring (MHWS).

b) References to the location of a wind turbine generator are

references to the centre point of the tower of that WTG.


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Figure 1.1 - Indicative turbine classes Image not to scale


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1.3 Monopile Foundation

1.3.1 An indicative drawing of a monopile foundation is shown in

Figure 1.2.

1.3.2 A monopile foundation can support the WTGs and the

meteorological mast.

1.3.3 The following definitions for the monopile foundation are included

in the draft DCO:

"steel monopile foundation" means a steel, concrete, or steel and

concrete large diameter pile, typically cylindrical, driven and/or

drilled into the seabed or fixed to the seabed with suction

caissons, including associated scour protection, transition piece, J-

tubes, corrosion protection systems, boat landings comprising an

access ladder with vertical boat fenders fitted either side, access

and work platforms and equipment;

"suction caisson" means a steel cylindrical structure which is

fixed to the base of the foundation and partially or completely

penetrates the seabed and remains in place using its own weight

and hydrostatic pressure differential.

1.3.4 The parameters for the monopile foundation in the draft DCO are

as follows:

a) Each steel monopile foundation forming part of the authorised

development may be attached to the seabed using piles or

suction caisson and

i. Each piled steel monopile foundation must not have a

diameter more than 8 metres;

ii. Each suction caisson steel monopile foundation must not

have

a diameter at the level of the seabed which is more

than 20 metres;

a base height, where there is a flat base, which is

more than 20 metres; and


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more than one suction caisson per

foundation.

Figure 1.2 - Illustration of a monopile foundation


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1.4 Gravity Base Foundation

1.4.1 An indicative drawing of a gravity base foundation is shown in

Figure 1.3.

1.4.2 A gravity base foundation can support the WTGs, the Offshore

Substation Platforms and the meteorological mast.

1.4.3 The following definition for the gravity base foundation is


"gravity base foundation" means a structure principally of

concrete or steel and concrete which rests on the seabed due to

its own weight with or without added ballast or skirts, including

associated sea bed preparation, scour protection, J-tubes,

corrosion protection systems, boat landings comprising an access

ladder with vertical boat fenders fitted either side and work

platforms and equipment;

1.4.4 The parameters for the gravity base foundation in the draft DCO

are as follows:

a) Each gravity base foundation forming part of the authorised

development must not have

i. a diameter at the level of the seabed which is greater

than 45 metres;

ii. a column diameter which is greater than 8 metres;

iii. a cone/column intersect which is higher than 32 metres

above the top of the seabed; and

iv. a cone diameter at its base which is greater than 45

metres.


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Figure 1.3 - Illustration of a gravity base foundation


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1.5 Space Frame Foundation

1.5.1 An indicative drawing of a space frame foundation is shown in

Figure 1.4.

1.5.2 A space frame foundation can support the WTGs, the Offshore

Substation Platforms and the meteorological mast.

1.5.3 The following definitions for the space frame foundation are


"space frame foundation" means a jacket lattice type structure

constructed of concrete, steel or steel and concrete which is fixed

to the seabed at three or more points with driven or pre-installed

piles or suction caissons, including associated scour protection,

J-tubes, corrosion protection systems, boat landings comprising

an access ladder with vertical boat fenders fitted either side,

access and work platforms and equipment;

"suction caisson" means a steel cylindrical structure which is

fixed to the base of the foundation and partially or completely

penetrates the seabed and remains in place using its own weight

and hydrostatic pressure differential.

1.5.4 The parameters for the space frame foundation in the draft DCO

are as follows:

a) Each space frame foundation forming part of the authorised

development must not have

i. a width spacing between each leg at the level of the

seabed which is greater than 35 metres; and

ii. more than 4 legs.

b) Each space frame foundation forming part of the authorised

development may be attached to the seabed using piles or

suction caisson and

i. each piled space frame foundation must not have

a pile diameter which is more than 3.5 metres;

and


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more than one pile per leg.

ii. Each suction caisson steel space frame foundation must

not have

a diameter at the level of the seabed which is more

than 15 metres;

a base height, where there is a flat base, which is

more than 20 metres; and

more than one suction caisson per leg.


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Figure 1.4 - Illustration of a space frame foundation


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1.6 Offshore Substation Platform

1.6.1 The following definition for the offshore substation platform is


"Offshore Substation Platform" means an offshore platform

constructed of steel or concrete or steel and concrete with single

or multiple decks housing major electrical equipment including

high voltage transformers, switchgear, control rooms, cabling

and busbars, lightning protection masts, communications masts,

cable management, back-up generators, fuel storage,

emergency accommodation, workshops and stores, helidecks or

helihoist facilities, cranes and other associated electrical and

ancillary equipment.

1.6.2 The parameters for the Offshore Substation Platforms in the

draft DCO are as follows:

a) the total number of offshore substation platform forming

part of the authorised scheme must not exceed three;

b) the dimensions of any offshore substation platform forming

part of the authorised scheme (excluding helipads, towers,

masts and cranes) must not exceed 50 metres in height

when measured from LAT, 45 metres in length and 45

metres in width; and

c) each offshore substation platform must have no more than

one supporting foundation.

1.6.3 A picture of the offshore substation platform at Prinses

Amaliawindpark is given in Figure 1.5.

1.6.4 An example of an installation of an offshore substation platform

by a Sheer Leg is given in Figure 1.6.


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Figure 1.5 - Offshore substation platform at Prinses Amaliawindpark, The Netherlands


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Figure 1.6 - Example of an installation of an Offshore Substation

Platform by a Sheer Leg

(courtesy of Belwind)


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1.7 Inter Array Cable

1.7.1 The inter array cables are laid between the turbines and will;

be Alternating Current (AC), operating at a voltage of 66kV,

33kV or 11kV;

be steel armoured, 3-core cables with XLPE insulation;

have a conductor which will be either copper or aluminium

with cross sections up to 800 mm2; and

have integrated optical fibre cables for data transmission.

1.7.2 An inter array cable is shown in Figure 1.7.


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Figure 1.7 - An inter array cable

CopyrightNexans Norway


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1.8 Export Cables

1.8.1 The High Voltage export cables will connect the offshore

substation platforms to the shore and will;

be Alternating Current (AC) operating at a voltage level of up

to 275kV;

the number of cables required will be between three and six,

depending on the final design and cost detailed cost analysis;

be armoured, 3-core cables with XPLE insulation;

have a conductor which will be either copper or aluminium

with cross sections up to 1600mm2; and

have export cables with integrated optical fibre cables for data

transmission.

1.8.2 A cross-section of an export cable is shown in Figure 1.8.


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Figure 1.8 - Cross-section on an export cable

CopyrightNexans Norway


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1.9 Meteorological Mast

1.9.1 The following definition for the meteorological mast is included in

the draft DCO:

"meteorological mast" means a lattice tower housing or

incorporating equipment to measure wind speed and other wind

characteristics, including a service platform housing electrical

and communication equipment and associated equipment,

oceanographic equipment and connecting cable, and marking

and lighting;

1.9.2 The parameters for the meteorological mast in the draft DCO are

as follows:

a) No lattice tower forming part of a meteorological mast shall

exceed a height of 120 metres above LAT;

b) Each meteorological mast must have no more than one

supporting foundation.

1.9.3 A picture of a meteorological mast structure is given in Figure

1.9.


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Figure 1.9 A picture of a meteorological mast structure


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Figure 1.10 - Diagram of an offshore wind farm

CopyrightEDF Energies Nouvelles


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Figure 1.11 - Offshore process in the development, installation and operation of a Round 3 wind farm

(Reproduced with the permission of The Crown Estate and BVG

Associates)

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8.1 Offshore Illustrative Drawings

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