© Statoil ASA 2014

Hywind Scotland – Marine Operations

Science Meets Industry Stavanger 06.04.2016

Knut Harald Lien

Agenda

• Introduction

• Statoil and floating wind

• What is Hywind Scotland Pilot Park

• Hywind Scotland Marine Operations

• Questions

2

Current Portfolio

Statoil positioning in offshore wind

2009- 2012- 2017

2.3MW

Sheringham

Shoal

Hywind

Demo

317MW

1.11 Twh / yr

Hywind

Commercial

Park

Increase Portfolio & Acreage

Hywind

pilot park

402MW

1.7 Twh / yr

Dudgeon

30MW

0,14 Twh / yr

1200MW

each project

Dogger

Bank

In operation In operation FID 02.11.2015

Construction and

installation phase

FID

Construction and

installation phase

2017- 2020-

Japan

US

North

West

Europe

3

4

What is Hywind?

• Floating wind turbine (FWT)

• A standard offshore wind turbine

placed on a ballasted vertical steel

cylinder, anchored to the seabed

• Active motion controller

• Statoil-owned technology

Pilot Park, 3-6 turbines <2017

Concept 2001

Model test 2005

Full-scale prototype 2009

Large Parks, 500-1000MW <10 years

© Statoil ASA 2014

Hywind Scotland Pilot Park

5

Installed capacity (5 WTGs) 30 MW

Transmission voltage 33 kV

Water depth 95-120 m

Mean waves, Hs 1.8 m

Average wind speed (@100 m) 10.1 m/s

Major milestones:

Final investment decision 2015

Construction/installation 2016/2017

In operation 2017

© Statoil ASA 2014

Project objectives

• Test multiple units in park-configuration

• Verify up-scaled design

• Optimize assembly and installation

• Verify reliability and availability of optimized

multi-turbine concept

• Mobilize supply chain

6

Demonstrate cost-efficient and low risk solutions for commercial scale parks

Hywind Demo Hywind Scotland

© Statoil ASA 2014

Park location and cable corridor

7

© Statoil ASA 2014

Hywind Scotland Pilot Park

8

© Statoil ASA 2014

Field layout

9

© Statoil ASA 2014

Marine operarations

• Transportation of Substructures

• Upending of Substructure

• Dry ballasting and de-ballasting

• Lifting and mating of fully assembled WTG onto Substructure

• Mooring anchors and bottom chain installation

• Intermediate mooring chain installation and pretensioning

• Tow to field & hook-up

• Cable installation and trenching

10

© Statoil ASA 2014

Marine Ops Schedule

11

© Statoil ASA 2014

Transportation of Substructures (3 trips)

12

• Substructures will be transported from Fene in Spain to Stord

• Float-on operation inshore

• Transport across Bay of Biscay and English Channel

• Float-off at Stord

© Statoil ASA 2014

Typical Substructure

13

© Statoil ASA 2014

Upending

14

• Water pumped into Substructure in order to upend it

• Pictures from Hywind Demo in 2009

© Statoil ASA 2014

Floating Quay - Before mating

15

Text large (build up) including image

Dry ballasting and de-ballasting

• Approx. 5,000Te of magnetite will be installed in each Substructure

• Typical rock installation vessel with loading arm

• Simultaneous de-ballasting of water in order to maintain draft

16

17

Mating

18

Mating

© Statoil ASA 2014

Floating Quay - After mating

19

© Statoil ASA 2014

Mooring system pre-installation

20

• Separate campaign for suction anchor and bottom chain pre-installation

(~100Te, 16m x 5m Ø)

• Intermediate chain and pre-tensioning

© Statoil ASA 2014

Tow to field & hook-up

• 4 days at 3-knot speed per WTG

• Model tests performed to check VIM

• Hook-up performed simulatenously as the next WTG is towed out

21

© Statoil ASA 2014

Hook-up

22

© Statoil ASA 2014

Power cable installation

• Loadout of cables from Nexans in Halden

• Installation of vertical riser anchors and mattresses for crossings

• Installation of export cable – starting at Peterhead

• Installation of 4 infield cables

• Trenching of export cable

• Rock installation

23

© Statoil ASA 2014

Deck layout

24

© Statoil ASA 2014

Landfall pull-in

• 600-700m duct

• Exit at -14m

• Pre-installed

messenger wire in

duct

2014-05-09 25 Classification: Open

© Statoil ASA 2014

Landfall pull-in

26

© Statoil ASA 2014

Dynamic riser configuration

27

Pliant wave design

© Statoil ASA 2014

Dynamic riser configuration

28

• All risers have almost identical tethered wave configurations

• Approx 30 off buoyancy modules

• Vertical anchor and tether system

• Horizontal anchor by means of rock installation or hold back

anchor

© Statoil ASA 2014

Installation steps • Export cable:

− Installation of a vertical tether anchor

− Pull-in at landfall through pre-drilled Horizontal Direction Drilling (HDD) duct

− Cable-lay in pre-defined route - 26km

− 2nd end pull-in of cable at FWT (incl. buoyancy modules and connection to vertical anchor)

− Trenching of the export cable route

− Rock installation in areas where trenching is not possible

• Infield cables:

− Installation of vertical tether anchors (one for each dynamic riser)

− 1st end pull-in of cable at FWT (incl buoyancy modules and connection to vertical anchor)

− Cable-lay of static section of cable – approx 1km

− 2nd end pull-in of cable at FWT (incl buoyancy modules and connection to vertical anchor)

− Rock installation in some areas due to on-bottom stability issues, alternatively trenching is an option

29

© Statoil ASA 2014

1st end installation - through moonpool or using vertical lay system

30

© Statoil ASA 2014

Questions?

2014-05-09 31 Classification: Open

Hywind Scotland - Developing the UK’s

first floating wind park

Knut Harald Lien

Company Representative – Cable

fabrication and Installation Contracts

Hywind Scotland Pilot Park

knhl@statoil.com

Tel: +4792234138 www.statoil.com

32 © Statoil ASA 2014

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