Barrow Offshore WindfarmDesign & Build of UKs First OWF Sub-

station

October 2005

Phillip CartwrightCommercial/Engineering Director

AREVA T&D Technology Centre

Rupert BerrymanEngineering Manager - Barrow Offshore Wind Farm

VKBR

2Agenda

1. Introduction to design & build team members

2. Overall Project Scope & Context

3. Lessons Learnt

4. Summary

31. Introduction to design & build team members

4The Team

XClientsCentrica - Major UK energy generation & supply

company

DONG - Major Danish Oil, Gas and energy generation & supply company

XPrime ContractorVestas - Major Danish wind turbine manufacturerKBR International engineering and programme

management company

5The Team

DONG CENTRICA

Barrow Offshore Wind Ltd

MPIOffshore

Installation

SIF/SMULDERSSubstructure fabrication

VESTAS

WTG

AREVAElectricalPackage

PIRELLI/NEXANSMarine Cable

Supply

VKBRConsortium

50% 50%

VKBRStructural

Design

62. Overall Project Scope and Context

7The Challenge

XConnect 30, 3MW Wind Turbines to the GridSystem via an offshore sub-station

XEnsure the connection meets the requirementsof the connection agreement

8The Key Connection Requirements

XThe steady state reactive power flow at the Heysham substation connection point shall be unity power factor +/- 5MVAr for active power flow in the range 0 and 90MW into the NGT system

XThe system shall remain stable and connected to the system without tripping for a solid three phase fault or any unbalanced short circuit for a total fault clearance time of up to 140ms

9The 90MW Barrow Offshore Wind Farm Project

10

The 90MW Barrow Offshore Wind Farm Project

VKBR copyright

11

Headline Project Scope1) Design

Conceptual and structural design VKBR System studies, detailed electrical design and equipment supply - AREVA

2) Connection at Heysham The wind farm connects into the Grid via an existing United Utilities circuit within

Heysham switchyard

3) Transmission Cable System 27km of offshore, single 3-core cable 132kV 2.8 km of single circuit, 3 off single-core cable 132kV system

4) Module supply and fitout - Module Builders, Aberdeen Cabins:- Protection and control, 33kV, 132kV, Capacitors, Diesel Generator, HVAC,

Mess/Refuge 132/32kV main and auxiliary transformers

5) Modules and other plant fitted onto Platform Fitted at Barrow, site and main deck supplied by VKBR. Module fixing and inter-

module cabling works performed by installation contractor, Test and Dry Commissioning by AREVA

6) Electrical System commissioning Includes commissioning work on offshore platform

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Site Locations

Leatherhead VKBR Offices

Barrow, Platform kitout

Aberdeen, Modules

Heysham connection point

13

Connection at Heysham - Onshore

XHeysham Grid connection pointNew sub-station adjacent to Heysham switchyard

z All civil works

z 132kV open terminal bay (Extended creep)

z Solidly connected 24MVAr shunt reactor

z Incoming cable from beach cable vault

z Outgoing cable from new compound to existing Heysham switchyard circuit breaker

z Protection System, SCADA RTU,Batteries and LVAC auxiliaries

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Offshore Sub-station

X OverviewLength - 23mWidth - 15mHeight - 10mWeight - 440 tonnes

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Offshore Substation

XModularised quipment33kV Board 14 panel including protection33/132kV 120MVA Transformer with OLTC132kV GISRelay and control panel suite roomLVAC and DC plant room (incs UPS for navigation lights)225kVA standby diesel generatorRefuge, mess and workshop modules5MVAr shunt capacitor bank modulesHVAC systems INERGEN/water mist fire suppression system

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Power Transformer

AuxiliaryTransform

er

Module BModule A Module C

Module E

Module D

Heli-Lift

AuxiliaryTransformer

Module B

Module A

Module C

Platform Deck

Cable Deck132kV Cable Transition

33kV Cable Transition

P+132+M+1-W-*

Offshore Substation

17

Module C

Module A Module B

StandbyDiesel

33kV

LV Room

Control

132kV

Fire

StoreAuxiliary

Transformer

Power Transformer

Offshore Substation

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During Construction at end of June 05

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Loading Out 12th August 05

20

Offshore Sub-station

21

Installed on Monopile 16th August 05

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Project Programme

Order Placement 02/09/04 9

Modules ready for fitting to platform 10/05/05 9

Offshore Substation complete 02/08/05 9

Platform shipout (by VKBR) 16/08/05 9

Heysham available 24/08/05 9

Electrical System commissioned 01/11/05

Windfarm commissioned including10 day reliability run 10/05/06

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3. Lessons Learnt

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Lessons Learnt

X System Modelling Inter party confidentiality agreements need to be resolved pre-

contract commencement

XWay-leaves & Land LeasesAll way-leaves and land leases need to be finalised and secured

before construction contract is let

X Design Design Freezes are required after equipment interface reviews

z Hazop reviews

z Windfarm SCADA design that meets substation P&C design cycle

Clarity of Design & Supply responsibilitiesz Use of Division of Responsibility Matrix at contract development

stage - requires sufficient contract lead in time

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4. Summary

26

Summary

XFirst high voltage offshore substation in the UKA modularised solution - rapid assembly time at load-

out point

Sub-structure (mono-piles) is common with wind turbines (mono-piles) - economy of design

Rapid design, build and install programme