Whit tWhitegatePower StationPower Station

Brian O’BrienEngineering Manager

© Bord Gáis Energy

Engineering Manager

What is WhitegateWh ld BGE t P St tiWhy would BGE want a Power StationHow did we achieve itWhat is a CCGT & how does it work

Bord Gáis Energy

What is WhitegateWhat is Whitegate

• 445 MW Power Plant - Combined Cycle Gas turbine (CCGT)445 MW Power Plant Combined Cycle Gas turbine (CCGT)

• BGE Energy biggest investment

• Construction started in 2008 onthe €400 million state of-the-art plant & went commercial 2010.

• Plant design achieves high• Plant design achieves high efficiencies, that ensure customerscan rely on competitive energyfrom an environmentally sound power generation facility.

• Managed within the Assets Group of Bord Gáis EnergyBord Gáís Energy

• Managed within the Assets Group of Bord Gáis Energy.

Why would BGE want a WhitegateWhy would BGE want a Whitegate

• The primary objectives of the plant is to support the• The primary objectives of the plant is to support the BGE duel fuel energy offering. (Big Switch)

• Increase the installed capacity for electrical generation• Increase the installed capacity for electrical generation in Ireland

• Reduce the proportion of greenhouse gas emissions per• Reduce the proportion of greenhouse gas emissions per Mega watt (MW) of electricity generated through the operation of a highly efficient plant, thus contributing to Irelands obligations under the Kyoto ProtocolIrelands obligations under the Kyoto Protocol.

• The output of the plant can provide power for up to 400 000 homes and is the base platform from which400,000 homes and is the base platform from which Bord Gáis Energy sources & supplies electricity to the Irish market for many years to come.

Bord Gáís Energy

WhitegateWhitegate -- how did we achieve it

Bord Gáis Energy

DesignDesign/Build & Operate/Maintain/Build & Operate/MaintainDesignDesign/Build & Operate/Maintain /Build & Operate/Maintain

– Design / Build• Award EPC contract• Supervision• Commission to COD

– Operate / Maintain• Business Model (O&M / LTSA)• Long Term Integrity• Plant Improvement

Overview of WhitegateOverview of Whitegate

• The project provided the local economy with around 300• The project provided the local economy with around 300 jobs. During construction we had 800 people at peak

G• Exported electricity onto the Irish Grid system in late 2009, went commercial Nov 2010.

EPC (E i P & C t t) ith G l El t i &• EPC (Engineer, Procure, & Construct) with General Electric & GAMA.• GE supplied the single shaft configuration, with air cooled condensers. • Gama supplied the Balance of Plant (BoP) & construction managementGama supplied the Balance of Plant (BoP) & construction management• 1.8M man-hours worked without an LTA.

• Project completed on-time & ahead of budgetahead of budget

Fort MitchellFort Carlisle

Fort Mitchell (Spike Island)

Fort Davis Naval Base

BGE Whitegate PS

SiteRefinery

Jetty Whitegate Village

RefineryVillage

ESB Aghada Site

Gas Line & Grid Back-Feed and 4th

To Rafeen 220kV Station

Circuit Routes

4th Circuit (sub sea)

AGI RingnaskiddyGlanagow GIS/AIS

220kV Station

ConocoPhillips Beach

From Aghada220kV Station

Back-Feed circuit

Gas Line

9

What is a CCGT& how does it work

Bord Gáis Energy

Gas Turbine Power PlantsGas Turbine Power Plants -

•• Combined Cycle Gas TurbinesCombined Cycle Gas Turbines (CCGT) Whit t•• Combined Cycle Gas Turbines Combined Cycle Gas Turbines (CCGT) e.g. Whitegate

•• Open Cycle Gas TurbinesOpen Cycle Gas Turbines (OCGT) e g Kilkenny / Athlone / Cahir•• Open Cycle Gas Turbines Open Cycle Gas Turbines (OCGT) e.g. Kilkenny / Athlone / Cahir

The main difference between them:-

CCGTCCGT consist of:CCGTCCGT consist of:-• GT, Generator BOP, HRSG, ST.

OCGTOCGT consist of:-• GT, Generator & BOP.

Bord Gáís Energy

CCGT ConfigurationCCGT Configuration

Bord Gáís Energy

PLANT OVERVIEW - CCGTPLANT OVERVIEW - CCGT

GasAir

SteamAir CooledCondenser

Steam TurbineHot Exhaust

Gas TurbineHRSG

GenSTCondenser

Electricity to Grid

Gas Turbine

Air Cooled Condenser

CCGTCCGT consist of a GT, HRSG, ST & BOP

Bord Gáís Energy

CCGT CCGT consist of a GT, HRSG, ST & BOP

So what is Combined Cycle?So what is Combined Cycle?

• Combined Cycle (CCGT), combines two thermodynamic cycles, Brayton Cycle (gas) & Rankine Cycle (steam).

• In a CCGT, a GT generator generates electricity and the waste heat is used to make steam to generate additional electricity via a steamused to make steam to generate additional electricity via a steam turbine; this last step enhances the efficiency of electricity generation.

• Open Cycle (OCGT) utilise one thermodynamic cycle, Brayton cycle (gas).

• OCGT utilise the energy their fuel generates to power a turbine. The remaining heat from combustion is exhausted. While not the most efficient, it does give the plant flexibility to cope with instantaneous demands.

Bord Gáís Energy

Gas TurbineGas TurbineGas Turbine Gas Turbine

Power ExhaustCompressorAir Inlet Burners

Power Turbine

Exhaust

Bord Gáís Energy

GE - 9FB Gas TurbineGE 9FB Gas Turbine

Air Inlet Compressor Burners Power TurbineAir Inlet Compressor Burners Power Turbine

Bord Gáís Energy

CCGT DemoCCGT Demo

• Enfield CCGT Power Station (Alstom GT26B)• Enfield CCGT Power Station (Alstom GT26B)

Bord Gáís Energy

Whitegate CCGTWhitegate CCGT

• GT Generates:- ~280MWST Generates 150MW• ST Generates:- ~150MW

• Duct Burners:- ~15MWT t l 445MW• Total:- 445MW

• Power is produced at 19 KV and raised by a step up transformer to 220 KV before being fed to gridtransformer to 220 KV before being fed to grid.

• High voltages are used in the transmission system to minimise electrical lossesminimise electrical losses.

Bord Gáís Energy

Thank UThank U