Transmission Forecast Statement 2011-2017-Web Version2

7/28/2019 Transmission Forecast Statement 2011-2017-Web Version2

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www.eirgrid.com

TRANSMISSIONFORECAST STATEMENT2011-2017


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DisclaimerE i r G r i d , t h e T r a n s m i s s i o n S y s t e m O p e r a t o r ( T S O ) f o r I r e l a n d , m a k e s n o w a r r a n t i e s o r

r e p r e s e n t a t i o n s o f a n y k i n d w i t h r e s p e c t o f t h i s d o c u m e n t , i n c l u d i n g , w i t h o u t l i m i t a t i o n , i t s

q u a l i t y , a c c u r a c y a n d c o m p l e t e n e s s . T h e T S O d o e s n o t a c c e p t l i a b i l i t y f o r a n y l o s s o r d a m a g e

a r i s i n g f r o m t h e u s e o f t h i s d o c u m e n t o r a n y r e l i a n c e o n t h e i n f o r m a t i o n i t c o n t a i n s . U s e o f

t h i s d o c u m e n t a n d t h e i n f o r m a t i o n i t c o n t a i n s i s a t t h e u s e r s s o l e r i s k . I n a d d i t i o n , t h e T S O

s t r o n g l y r e c o m m e n d s t h a t a n y p a r t y w i s h i n g t o m a k e a d e c i s i o n b a s e d o n t h e c o n t e n t o f t h i s

d o c u m e n t s h o u l d c o n s u l t t h e T S O i n a d v a n c e .

Copyright NoticeA l l r i g h t s r e s e r v e d . T h i s e n t i r e p u b l i c a t i o n i s s u b j e c t t o t h e l a w s o f c o p y r i g h t . T h i s p u b l i c a t i o n

m a y n o t b e r e p r o d u c e d o r t r a n s m i t t e d i n a n y f o r m o r b y a n y m e a n s , e l e c t r o n i c o r m a n u a l ,

i n c l u d i n g p h o t o c o p y i n g w i t h o u t t h e p r i o r w r i t t e n p e r m i s s i o n o f t h e T S O .


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FOREWORD

E i r G r i d i s p l e a se d t o p r e se n t t h i s T r a n smi ss i o n F o r e c a st

S t a t e me n t , wh i c h h a s b e e n p r e p a r e d i n a c c o r d a n c e wi t h t h e

p r o v i s i o n s o f S e c t i o n 38 o f t h e E l e c t r i c i t y R e g u l a t i o n A c t ,

1 999. I t su p e r c e d e s Transmission Forecast Statement 2010-

2016 Vers ion 2.0 , p u b l i sh e d i n M a r c h 2 01 0.

In Transmission Forecast Statement 2011-2017 we present information that should

h e l p c u st o me r s wh o a r e c o n si d e r i n g c o n n e c t i o n o f a g e n e r a t o r o r a n e w l a r g e l o a d t o

t h e g r i d . W e q u a n t i f y t h e e x t e n t o f o p p o r t u n i t i e s a va i l a b l e f o r d e ma n d c o n n e c t i o n s a t

a range of locat ions throughout the gr id, summarise the generat ion opportunit ies

ident i f ied through the Gate 3 process and discuss the opportunit ies for generatorconnect ions based on EirGrids gr id development strategy, G R I D25, and the Gate 3

g r o u p p r o c e ssi n g sc h e me f o r g e n e r a t o r s .

O ve r t h e p e r i o d c o ve r e d b y t h i s s t a t e me n t t h e r e wi l l b e s i g n i f i c a n t o p p o r t u n i t i e s f o r

new demand connect ions in most parts of the country. In response to stakeholder

feedback, for this statement we have ident i f ied a number of st rategic 220 kV si tes

t h a t h a ve t h e c a p a b i l i t y t o a c c o mmo d a t e ma j o r i n d u st r i a l l o a d c e n t r e s.

T h e r e a r e l i mi t e d o p p o r t u n i t i e s f o r g e n e r a t o r c o n n e c t i o n s i n t h e sh o r t t e r m. In t h e

l a t t e r y e a r s o f t h e s t a t e me n t a n d b e y o n d , t h e d e ve l o p me n t s a sso c i a t e wi t h G R I D25 wi l l

create signif icant opportunit ies for generator connect ions. The opportunit ies created

by G R I D25 wi l l faci l i tate the connect ion of al l Gate 3 generat ion and some post Gate 3

generat ion. Those who are considering connect ing to the gr id are advised to contact

EirGrid for further information.

We include a comprehensive review of exist ing and planned t ransmission network

d a t a , d e ma n d d a t a a n d g e n e r a t i o n d a t a , a s we l l a s a sh o r t c i r c u i t a n a l y s i s b a se d o n

the most recent data project ions. We provide an updated set of network data, maps

a n d d i a g r a ms wh i c h p r o v i d e d e t a i l s o f t h e t r a n smi ss i o n n e t wo r k a n d h o w i t i s

proposed to be developed over the 2011-2017 period.

F i n a l l y , i t i s o u r a i m t h a t t h e i n f o r ma t i o n c o n t a i n e d i n t h i s d o c u me n t i s i n f o r ma t i ve ,

pert inent and accessible. We welcome and value your feedback on the presentat ion,

style and content of this Transmission Forecast Statement at al l t imes.

De r mo t B y r n e

Chief Execut ive, Ei rGrid


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TABLE OFCONTENTS


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TRANSMISSION FORECAST STATEMENT 2011-2017

CONTENTS PAGEFOREWORDSUMMARY1 INTRODUCTION 1-11.1 Out l ine of the Transmission Forecast Statement 1-1

1.2 Treatment Of The Single Electr ic i ty Market 1 -2

1.3 Treatment Of Interconnect ion 1-2

1.4 Data Management 1-3

1.5 Publ icat ion 1-3

2 THE ELECTRICITY TRANSMISSION NETWORK 2-12.1 Overview of the Electr ic i ty Transmission Network 2-1

2.2 Exist ing Connect ions with Northern Ire land 2-2

2.3 Plan s For Transmission System Development 2-3

2.4 Connect ion of New Generat ion Stat ions 2-7

2.5 Connect ion of New Interface Stat ions 2-8

2.6 Detai led Network Information 2-9

3 DEMAND 3-13.1 Forecasts of Transmission Peaks 3-1

3.2 Comparison with Previous Demand Forecast 3 -2

3.3 Forecast Demand at Transmission Interface Stat ions 3-2

3.4 Demand Prof i les 3-3

4 GENERATION 4-14.1 Exist ing and Planned Grid-Connected Generat ion 4-1

4.2 Planned Ret irement/Divest i t ure Of Generat ion Plant 4-2

4.3 Embedded Generat ion 4-3

4.4 Wind Generat ion 4-4

5 TRANSMISSION SYSTEM PERFORMANCE 5-15.1 Forecast Power F lows 5-1

5.2 Compliance with Planning Standards 5-1

5.3 Short Circuit Currents 5-2


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6 OVERVIEW OF TRANSMISSION SYSTEM CAPABILITY 6-1ANALYSES

6.1 Transfer Capabil i ty Analyses For New Demand 6-1

6.2 Factors Impact ing On Results 6-3

7 NETWORK CAPABILITY FOR NEW GENERATION 7-17 .1 GR I D 25 7 - 1

7.2 Gate 3 and Post Gate 3 Generat ion Appl icants 7-1

7.3 Generat ion Connect ion Opportunit ies Created by GR I D 25 7-2

7.4 Impact of G R I D 25 and Post Gate 3 on Capabil i ty for New Generat ion 7-5

8 NETWORK CAPABILITY FOR NEW DEMAND 8-18.1 Incremental Transfer Capabil i ty Results For New Demand 8-1

8.2 Opportunit ies For New Demand 8-3

8.3 Impact Of Changes Since The Data Freeze 8-4

8.4 How To Use The Information For Demand 8-4


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APPENDICES

A MAPS AND SCHEMATIC DIAGRAMS A-1A.1 Network Maps A-1

A.2 Short Bus Codes A-4

A.3 Schematic Network Diagrams A-6

B NETWORK CHARACTERISTICS B-1B.1 Characterist i cs Of The Exist ing Network B-3

B.2 Changes In Network Characterist i cs B-14

C DEMAND FORECASTS AT INDIVIDUAL TRANSMISSION C-1INTERFACE STATIONS

D GENERATION CAPACITY AND DISPATCH DETAILS D-1D.1 Generat ion Connected To The Transmission System D-1

D.2 Generat ion Connected To The Distr ibut ion System D-6

D.3 Generat ion Dispatch Detai ls D-10

E SHORT CIRCUIT CURRENTS E-1E.1 Background E-1

E.2 Analys is E-2

E.3 Results E-3

F ADDITIONAL INFORMATION ON OPPORTUNITIES F-1G STUDY METHODS G-1G.1 Incremental Transfer Capabil i ty Studies For Demand G-1

H ABBREVIATIONS AND GLOSSARY H-1H.1 Abbreviat io ns H-1

H.2 Glossary H-3

I REFERENCES I-1J POWER FLOW DIAGRAMS J-1J . 1 Gu ide To The Powe r F l ow Di ag rams J - 1

K SIZE A3 GEOGRAPHICAL MAPS K-1


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TABLESTable S-1 Forecast of Peak Transmission Demand S-3

Table S-2 Summary of Generators with Signed Connect ion Agreements beforeJu ly 201 0 S-4

Table 2-1 Total Length of Exist ing Grid Circuits as at July 01 s t 2010 2-1

Table 2-2 Total Grid Transformer MVA Capacity as at July 01 s t 2010 2-2

Table 2-3 Total React ive Compensat ion as at July 01 s t 2010 2-2

Table 2-4 Planned Connect ion Methods of Future Generators 2-7

Table 2-5 Planned 110 kV Stat ions 2-8

Table 3-1 Transmission Demand Forecast , MW 3-1

Table 3-2 Comparison of Peak Demand Forecast with Previous TFS, MW 3-2

Table 4-1 Planned Grid-Connected Generat ion as at July 01s t

2010 4-1Table 4-2 Exist ing Embedded Generat ion as at July 01 s t 2010, MW 4-3

Table 4-3 Committed Embedded Generat ion as at July 01 s t 2010, MW 4-3

Table 4-4 Exist ing and Committed Wind Capacity Totals , MW 4-4

Table 4-5 Gate 3 Generat ion Area Totals 4-5

Table 5-1 Standard Equi pment Rat ing and Maximum Design Short Circui t

Currents 5-2

Table 7-1 Capabil i ty for New Generat ion for each region, MW 7-2

Table 8-1 Capabil i ty for Addit ional Demand at 110 kV Stat ions, MW 8-2

Table A-1 Short Bus Codes A-4Table A-2 Schematic Legend A-7

Table B-1 Nominal and Reference Voltage Levels B-2

Table B-2 Characterist ics of Exist ing 400 kV Lines B-3

Table B-3 Characterist i cs of Exist ing Cross-Border 275 kV Lines B-3

Table B-4 Characteri st ics of Exist ing 220 kV Lines and Cables B-4

Table B-5 Characterist i cs of Exist ing 110 kV Lines and Cables B-5

Table B-6 Characterist ics of Exist ing 400/220 kV Grid Transformers B-10

Table B-7 Characteri st ics of Exist ing 275/220 kV Grid Transformers B-11

Table B-8 Characterist ics of Exist ing 220/110 kV Grid Transformers B-12Table B-9 Characterist i cs of Exist ing Power F low Control ler B-13

Table B-10 Characteri st ics of Exist ing React ive Compensat ion B-13

Table B-11 Changes in Circuit Characterist ics Expected Af ter July 01 s t 2010 B-15

Table B-12 Changes in Circuit Characteris t ics Expected in 2011 B-17

Table B-13 Changes in Circuit Characteris t ics Expected in 2012 B-19

Table B-14 Changes in Circuit Characterist i cs Expected in 2013 B-20

Table B-15 Changes in Circuit Characteri st ics Expected Beyond 2013 B-22

Table B-16 Characteri st ics of Grid Transformers Expected in 2010 B-24


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Table B-20 Characterist ics of Grid Transformers Expected Beyond 2013 B-25

Table B-21 Characteri st ics of React ive Compensat ion Expected in 2010 B-26

Table B-22 Characterist i cs of React ive Compensat ion Expected in 2011 B-26

Table B-23 Characterist i cs of React ive Compensat ion Expected in 2012 B-26

Table C-1 Demand Forecasts at T ime of Winter Peak C-1

Table C-2 Demand Forecasts at T ime of Summer Peak C-4

Table C-3 Demand Forecasts at T ime of Summer Val ley C-7

Table D-1 Maximum Export Capacit ies of Exist ing and Committed Transmission-

Connected Generat ion D-2

Table D-2 Maximum Continuous Rat ing of Exist ing and Committed Transmission-

Connected Generat ion D-4

Table D-3 Exist ing and Committed Distr ibut ion -Connected Wind Farm Capacity D-6

Table D-4 Exist ing and Committed Distr ibut ion-Connec ted Convent ional

Generat ion D-8

Table D-5 Dispatch Prof i les - Short Circuit and Demand Opportunity Analyses D-11

Table E-1 Short Circuit Current Levels - Standard Equipment Rat ing E-2

Table E-2 Short Circuit Currents for Maximum and Minimum Demand in 2011 E-3




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FIGURESFigure S-1 Capabil i ty for New Demand in 2014 and 2017 S-6

Figure 2-1 Exist ing Cross-Border Circuits 2-3Figure 3-1 Weekly Peak Values for Year 2009 3-4

Figure 3-2 Dai ly Demand Prof i les for Year 2009 3-4

Figure 4-1 Growth in Wind Capacity, 1992 to 2017 4-4

Figure 4-2 Gate 3 Wind Generat ion Areas 4-5

Figure 5-1 Grid Busbar Short Circuit Currents for Winter Peak 2014 5-4

Figure 6-1 I l lustrat ion of Typical Step Change in Network Capacity 6-2

Figure 6-2 Demand Prof i le at Typical Stat ion 6-3

Figure 8-1 110 and 220 kV Stat ions Studied for Demand 8-1

F igure 8-2 Capabil i ty for New Demand in 2014 and 2017 8-4Figure A-1 Transmission System 400 kV, 220 kV and 110 kV as at as at July 01 s t

2010 A-2

Figure A-2 Planned Transmission System 400 kV, 220 kV and 110 kV as at

December 31 s t 2017 A-3

Figure A-3 Schematic Diagram of the Exist ing and Planned Grid at End of 2010 A-8




F igure D-1 Geographical Locat ion of Exist ing and Planned Wind Farms at July 01s t

2010 D-9

Figure E-1 Typical Short Circuit Current E-1

F igure G-1 I l lustrat ion of Incremental Transfer Capabil i ty Study Method for G-5

Demand

Figure J -1 Power F low Diagram Summer Peak 2011 J -2

F igure J -2 Power F low Diagram Summer Val ley 2011 J -3

F igure J -3 Power F low Diagram Winter Peak 2011/12 J -4

Figure J -4 Power F low Diagram Summer Peak 2014 J -5

F igure J -5 Power F low Diagram Summer Val ley 2014 J -6Figure J -6 Power F low Diagram Winter Peak 2014/15 J -7

F igure J -7 Power F low Diagram Summer Peak 2017 J -8

Figure J -8 Power F low Diagram Summer Val ley 2017 J -9

F igure J -9 Power F low Diagram Winter Peak 2017/18 J -10

Figure K-1 Transmission System 400 kV, 220 kV and 110 kV as at July 01s t K -2

2010 (A3)

F igure K-2 Planned Transmission System 400 kV, 220 kV and 110 kV as at K-3

December 31 s t 2017 (A3)


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SUMMARY


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S- 1

SUMMARYIntroductionThe Transmission Forecast Statement (TFS) describes the status of the t ransmission grid

over the seven-year period f rom 2011 to 2017. I t provides information to customers

examining the potent ial of the grid f rom the electr ic i ty generator or large consumer

perspect ives. The technical information is provided to help customers ident i fy and evaluate

the opportunit ies avai lable for connect ing to or making use of the t ransmission system and

to al low them, i f desired, to undertake their own power f low analyses. The TFS provides

information about potent ial network constraints which should be informative for customers

intending to part ic ipate in the electr ic i ty market .

In this s tatement the Transmission System Operator (TSO) updates the information

published in earl ier Transmission Forecast Statements in l ight of developments that have

either taken place or are current ly scheduled to be completed over the coming years.

Overview of Information ProvidedThe format of Transmission Forecast Statement 2011-2017 is as fo l lows:

TFS 2011-2017 undertakes a comprehensive review of exist ing and planned transmission

network data and the exist ing and projected demand and generat ion data. The information

is presented in the form of maps, network diagrams, data tables and network models which

are in e lectronic format.

TFS 2011-2017 includes a short c i rcuit analys is to determine the maximum and minimum

short c ircuit levels at each 110 kV, 220 kV and 400 kV busbar on the t ransmission system,

for three stages of the seven year period covered by the TFS 2011, 2014 and 2017.

TFS 2011-2017 contains the results of analys is to quant i fy the Incremental Transfer

Capabil i ty ( ITC) l ikely to be avai lable between various parts of the grid. This information is

a general guide to potent ial demand customers who are considering connect ing to the grid.

EirGrid carr ied out the short c i rcuit and ITC analys is for TFS 2011-2017 and updated the

network models and tables based on data as known on the 01 s t of July 2010. The data was

frozen at this point .

TFS 2011-2017 provides indicat ive information on the opportunit ies for generator

connect ions based on EirGrids gr id development strategy, G R I D 25, and the Gate 3 group

processing scheme for generators. A summary of the generat ion opportunit ies ident i f ied as

part of the Gate 3 process is also included.

The Commission for Energy Regulat ion (CER) has approved this format in accordance with

the requirements of the Electr ic i ty Regulat ion Act 1999.


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S-2

The National GridThe nat ional gr id plays a vi tal ro le in the supply of e lectr ic i ty. In s imple terms, i t t ransports

power f rom gener ators to demand centres using a system compris ing 400 kV, 220 kV and

110 kV networks. The 400 kV and 220 kV networks form the backbone of the grid. They have

higher power carrying capacity and lower losses than the 110 kV network. The 400 kV l ines

cross the country providing a high capacity path for power f lows between Dubl in and

Galway and the Moneypoint generat ion stat ion in Co. Clare. The 220 kV network comprises a

number of s ingle c ircuit loops around the country. The 110 kV network is the most extensive

part of the grid, reaching into every county in the Republic of I re land.

The grid is planned and developed to ensure i t meets projected t ransmission needs while

maintaining i ts performance within def ined rel iabi l i ty s tandards. The analys is of current

performance indicates that the network is within standards in most areas at this t ime. Tocont inue to meet standards, in the context of forecast demand and new generat ion

connect ions, there is a requirement for ongoing development to re inforce the grid. The

transmission development projects , selected and planned by the TSO as at the t ime of the

TFS 2011-2017 data f reeze date ( July 2010), are l is ted in Sect ion B.2 of Appendix B and are

included in the short c i rcuit and ITC analyses carr ied out for TFS 2011-2017. Projects

selected and planned s ince July 2010 are l is ted in Sect ion 1 .4.

Single Electricity MarketIn November 2007, a Single Electr ic i ty Market (SEM) was establ ished on the is land of

I re land. The al l - is land wholesale e lectr ic i ty market al lows both Northern Ire land and the

Republic of I re land to benef i t f rom increased competit ion, reduced energy costs and

improved rel iabi l i ty of supply.

The nat ional gr id is e lectr ical ly connected to the t ransmission system of Northern Ire land

by means of one 275 kV double c ircuit con nect ion at Louth and two 110 kV connect ions at

Le t t e rk e nny i n C o . D o ne g al and C o rrac l as s y i n C o . C avan. E i rG r i d and N o rt he rn I re l and

Electr ic i ty (NIE) are planning a new 400 kV cross-border c ircuit , which is due to be instal led

by 2014. Together with other re inforcements, the new circuit wi l l faci l i tate a greater degree

of f lexibi l i ty in the new market. In the context of the SEM, al l cross-border c ircuits areessent ial ly internal c i rcuits in the new market.

InterconnectionIn July 2006, Minister Noel Dempsey TD, then Minister for Communicat ions, Marine and

Natural Resources, requested that the Commission for Energy Regulat ion (CER) arrange a

competit ion to secure the construct ion of a 500 MW East-West interconnector between

Ireland and Great Bri tain. The Interconnector wi l l connect a converter s tat ion near

Woodland 400kV transmission stat ion in Co. Meath to another converter s tat ion near


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S-3

Deeside 400kV transmission stat ion in North Wales via two High Voltage Direct Current

cables. The interconnector wi l l be capable of import ing and export ing 500MW of e lectr ic i ty.

The project is now ful ly permitted. Design, manufacturing, and construct ion are nowunderway in Bri tain and Ire land. Marine instal lat ion works are scheduled to take place in

2011 and 2012. The interconnector is expected to be operat ional in the lat ter part of 2012.

Demand ForecastsThe project ions of demand for e lectr ic i ty are largely based on forecasts of economic growth

produced by the Economic and Social Research Inst i tute (ESRI) . The project ions are

compatible with provis ional demand f igures intended for inclusion in the All - is land

Generat ion Capacity Statement 2011-2020 (GCS).

The grid must be capable of t ransport ing power f lows for varying levels of demand.

However, the f low at peak demand is f requent ly, al though not exclusively, the most

onerous. The project ions of demand f lows at peak are discussed in Chapter 3 . Table S-1

shows the forecasts of peak t ransmission demand for the years 2011 to 2017. These are

equivalent to project ions of peak exported generat ion requirements. Appendix C presents

forecasts of demand at each stat ion connected to the grid. Forecasts of t ransmission f lows

at peak take account of non-wind embedded generat ion. Because of i ts s ize and variabi l i ty,

t ransmission and distr ibut ion-connected wind generat ion is model led expl ic i t ly in the

analyses carr ied out for this TFS.

In overal l terms, the TSO expects that the peak demand wil l increase by approximately 2.0%

each year over the period of the TFS. This corresponds to that expected in Transmission

Forecast Statement 2010-2016.

Table S-1 Forecast of Peak Transmission Demand

Year Peak Demand ( MW)

2011 4,724

2012 4,813

2013 4,927

2014 5,046

2015 5 ,169

2016 5,230

2017 5 ,292


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S-4

Generation ConnectionsAt the t ime of the data f reeze ( July 2010), some 8,027 MW (net) of generat ion capacity was

instal led, of which 7,180 MW is connected to the nat ional gr id and 847 MW is connected

direct ly to the distr ibut ion system.

New generators with s igned connect ion agreements are included in the short c i rcuit

analys is for this s tatement. Table S-2 summarises the planned connect ions as at the

beginning of July 2010, when data was f rozen for the purposes of TFS model updates.

Table S-2 Summary of Generators with Signed Connect ion Agreements before July 2010

Type of Generat ion Connected to No. of Connect ions MW

Thermal Transmission 7 1 ,358

Wind Farm Transmission 9 376.1

Thermal Distr ibut ion 5 93.4

Hydro Distr ibut ion 1 0 .4

Wind Farm Distr ibut ion 63 665.9

Total 85 2,494

Taking account of these committed connect ions, expected unit derat ings and unit c losures,

the instal led capacity would be 10,278 MW by the end of 2017, of which 8,672 MW wil l be

transmission-connected.

ESB Power Generat ion conf irmed the closure of Poolbeg Units 1 , 2 and 3. The steam turbine

at Marina ceased operat ion in March 2010.

Endesa has purchased Great Is land and Tarbert generat ion stat ions as wel l as Rhode and

Tawnaghmore peaking plants f rom ESB.

In the period 2010-2011 3 ,989 MW of wind generat ion and 1,314 MW of convent ional

generat ion wi l l have received of fers under Gate 3 .

Transmission System Capability AnalysesThe nat ional gr id is planned to accommodate ant ic ipated power f lows based on exist ing and

planned generat ion and demand connect ions, and on interconnect ion with other

transmission systems. This TFS examines the capabil i ty of the grid to accommodate

addit ional f lows result ing f rom a new demand connect ion based on data describing the

exist ing and planned transmission system f rozen at the beginning of July 2010. Capabil i ty

is assessed at three stages of the seven-year period of the TFS - 2011, 2014 and 2017. For

the purposes of the analyses, generat ion was dispatched on an al l - is land basis in the cases

upon which studies were carr ied out. This was done in order to ref lect the manner in which

generat ion is dispatched in the SEM.


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S-5

T h e l o c a t i o n s a n a l y se d f o r n e w d e ma n d h a ve b e e n c a r e f u l l y r e v i e we d t h i s y e a r b a se d o n

f e e d b a c k f r o m i n d u st r y so u r c e s. T h e c h o se n st a t i o n s h a ve b e e n t a i l o r e d t o c l o se l y ma t c h

the needs of the users. In total , 31 stat ions are analysed for new demand connect ions.

T h e r e su l t s a r e u se f u l t o t h o se c o n si d e r i n g d e ve l o p me n t o f a s i g n i f i c a n t d e ma n d i n t h e

R e p u b l i c o f I r e l a n d . T h e y p r o v i d e a n i n d i c a t i o n o f l o c a t i o n s t h a t a r e c a p a b l e o f a c c e p t i n g

new demand connect ions without the need for further re inforcement of the gr id.

Opportunities for New DemandT h e g r i d i s p l a n n e d a n d d e ve l o p e d t o me e t f o r e c a st d e ma n d s i n a l l p a r t s o f t h e c o u n t r y . T h e

demand forecas t for each 110 kV stat ion is a propor t ion of the overal l sys tem demand

f o r e c a st b a se d o n h i st o r i c a l d e ma n d d i st r i b u t i o n s. A n a ve r a g e a n n u a l i n c r e a se o f 2 . 0% i s

expected at each sta t ion. This stat ement examines th e capabi l i ty of select ed 110 kV and

220 kV stat ions to accept a new dema nd addit ional to these fore casts. I t should be noted

that individual smal l demands of up to 10 MW are l ikely to be accommodated at most

l o c a t i o n s. S o me l o c a t i o n s ma y b e c a p a b l e o f a c c o mmo d a t i n g s i g n i f i c a n t l y l a r g e r d e ma n d s.

To put this in context , a demand of 10 MW represents the consumption of a typical

p h a r ma c e u t i c a l p l a n t .

As a general rule, opportunity at a part icular stat ion would tend to reduce over the course

o f t h e se ve n y e a r s a s n o r ma l d e ma n d g r o wt h u se s t h e a va i l a b l e c a p a c i t y . H o we ve r , i n ma n y

c a se s d e ma n d o p p o r t u n i t i e s i mp r o ve i n l a t e r y e a r s a s a r e su l t o f p l a n n e d n e t wo r k o r

generat ion developments.

The results of the analysis point to opportunit ies at the majori ty of the stat ions tested.

F igure S-1 shows the opportunit ies for new demand in 2014 and 2017. The diagrams show

t h a t t h e r e wi l l b e s i g n i f i c a n t d e ma n d o p p o r t u n i t i e s i n mo st p a r t s o f t h e c o u n t r y i n b o t h

y e a r s .

A n a l y s i s o f t h e 2 2 0 k V g r i d su g g e st t h a t so me st r a t e g i c s i t e s h a ve t h e c a p a b i l i t y t o

a c c o mmo d a t e ma j o r i n d u st r i a l d e ve l o p me n t s i n e x c e ss o f 2 00 M W .


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S-6

80 MW

30 MW40 MW

10 MW

10 MW

50 MW

50 MW

70 MW

110 MW

30 MW

80 MW

80 MW10 MW

20 MW

90 MW

50 MW

30 MW

130 MW

60 MW

60 MW

90 MW

20 MW

50 MW

40 MW

100 MW

30 MW

40 MW

230 MW

230 MW

60 MW

30 MW

F igure S-1 Capabi l i ty for New Demand in 2014 and 2017

Opportunities for New GenerationTFS 2011-2017 provides indicat ive information on the opportunit ies for generator

c o n n e c t i o n s b a se d o n E i r G r i d s g r i d d e ve l o p me n t s t r a t e g y , G R I D2 5 , a n d t h e G a t e 3 g r o u p

p r o c e ssi n g sc h e me f o r g e n e r a t o r s . A su mma r y o f t h e g e n e r a t i o n o p p o r t u n i t ie s i d e n t i f i e d a s

p a r t o f t h e G a t e 3 p r o c e ss i l l u st r a t e s t h a t b y 2 01 7 t h e d e ve l o p me n t s a sso c i a t e d wi t h G R ID2 5

create capacity on the gr id to accommodate more than 2,000 MW of Gate 3 generat ion.

ConclusionEirGrid has plans in place to cater for the forecast needs of the gr id. However, network

development planning is a cont inuous process designed to meet the ever changing needs

f o r t r a n smi ss i o n . C o n n e c t i o n o f n e w g e n e r a t i o n a n d l a r g e p o i n t d e ma n d s c a n r e su l t i n a

st e p c h a n g e i n g r i d r e q u i r e me n t s a n d i n i t s a b i l i t y t o o p e r a t e wi t h i n s t a n d a r d s. In

p a r t i c u l a r , l a r g e g e n e r a t o r c o n n e c t i o n s c a n g i ve r i se t o t h e n e e d f o r l a r g e t r a n smi ss i o n

r e i n f o r c e me n t p r o j e c t s t h a t ma y t a k e a l o n g t i me t o c o mp l e t e . De ve l o p e r s wi sh i n g t o

connect should consult the TSO early in their development process to explore opt ions

r e l a t i n g t o t h e i r p r o p o sa l t h u s e n a b l i n g t i me l y d e c i s i o n ma k i n g .

T h o se wh o a r e c o n si d e r i n g c o n n e c t i n g g e n e r a t i o n o r d e ma n d t o t h e n a t i o n a l g r i d sh o u l d

contact the TSO at info@eirgr id.com for further information.

2014 2017


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S- 7

Members of the Transmission Forecast Statement Team. From Lef t to Right: Richard Crowley,

Simon Grimes and Tom Gal lery.


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1.1 OUTLINE OF THE TRANSMISSION FORECAST STATEMENT

1.2 TREATMENT OF THE SINGLE ELECTRICITY MARKET

1.3 TREATMENT OF INTERCONNECTION

1.4 DATA MANAGEMENT

1.5 PUBLICATION

INTRODUCTION

01


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1-1

1 INTRODUCTIONThe nat ional gr id is a high voltage system of networks which t ransports power f romgenerators to demand centres. The f low of power is determined by the levels of demand at

al l parts of the system and by the s ize and locat ion of generat ion supplying that demand.

Interconnect ion with other systems can be a source of generat ion or a demand for power.

Transmission Forecast Statement 2011-2017, prepared in accordance with Sect ion 38 of the

Electr ic i ty Regulat ion Act , 1999, presents factual information on, and current Transmission

System Operator (TSO) project ions for, the grid, e lectr ic i ty demand, generat ion, and

interconnect ion with other e lectr ic i ty systems. The appendices provide customers with

detai led information to carry out their own power f low analys is , i f desired.

EirGrid and SONI, as Transmission System Operators (TSOs) for I re land and Northern Ire land

respect ively, publ ished the All - is land Generat ion Capacity Statement 2011-2020 ( G C S ) i n

December 2010. That document deals with the requirement for addit ional generat ion

capacity to meet forecast demand over the ten-year period to 2020. In so far as possible the

GCS complements the demand information presented in Transmission Forecast Statement

2011-2017.

The TSO publ ished i ts Draf t Transmission Development Plan 2010 for Publ ic Consultat ion in

November 2010. The plan provides detai ls of the network developments expected to be

progressed in the f ive-year period to 2015, which are accounted for in this TFS.

1.1 OUTLINE OF THE TRANSMISSION FORECAST STATEMENTChapter 2 describes the exist ing t ransmission network, including connect ions with Northern

Ireland, and provides a brief out l ine of the TSOs network development plans. Detai led

descript ions of these plans are presented in Draf t Transmission Development Plan 2010,

which was publ ished for Publ ic Consultat ion in November 2010. These documents present a

snapshot of the development plans at a point in t ime. However, the planning and

development process is dynamic and may be ref ined in l ight of more up-to-date information.

As such, network development plans should be conf irmed with the TSO before any business

decis ions are taken based on the content of this document. Maps, schematic diagrams and

network detai ls are included in Appendix A and Appendix B. Geographical maps of the

transmission system are provided in A3 format in Appendix K.

Chapter 3 describes the demand forecasts and Chapter 4 describes the generat ion

project ions. Detai ls of the demand forecasts and generat ion assumptions are in Appendix C

and Appendix D respect ively.


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1-2

The assumptions presented in Chapters 2 to 4 form the basis of the short c i rcuit currents

presented in Chapter 5 and the analys is of t ransfer capabil i t ies described and reported in

Chapters 6 to 8. Appendix E presents forecast short c i rcuit currents at al l gr id stat ions.

Chapters 7 and 8 contain information on the opportunit ies for generator and demand

connect ions.

Diagrams are presented in Appendix J which show typical power f lows on al l gr id c ircuits for

a number of di f ferent condit ions.

1.2 TREATMENT OF THE SINGLE ELECTRICITY MARKETIn November 2007, a Single Electr ic i ty Market (SEM) was establ ished on the is land of

I re land. The al l - is land wholesale e lectr ic i ty market al lows both Northern Ire land and the

Republic of I re land to benef i t f rom increased competit ion, reduced energy costs and

improved rel iabi l i ty of supply.

The nat ional gr id is e lectr ical ly connected to the t ransmission system of Northern Ire land

by means of one 275 kV double c ircuit con nect ion at Louth and two 110 kV connect ions at

Letterkenny in Co. Donegal and Corraclassy in Co. Cavan. The TSO and Northern Ire land

Electr ic i ty (NIE) are planning a new 400 kV cross-border c ircuit , which is due to be instal led

by 2014. Together with other re inforcements, the new circuit wi l l faci l i tate a greater degree

of f lexibi l i ty in the new market. In the context of the SEM, al l cross-border c ircuits wi l l

essent ial ly become internal c ircuits in the new market.

In order to ref lect the way in which the t ransmission systems of the Republic of I re land and

Northern Ire land operate, the network was assessed with generat ion dispatched on an al l -

is land basis in network models. As such, f lows of power across cross-border c ircuits were

permitted in the short c i rcuit and power f low analyses carr ied out for TFS 2011-2017. I t is

important to note however that only the performance and capabil i ty of the t ransmission

system of the Republic of I re land is considered. The performance and capabil i ty of the

transmission system of Northern Ire land is addressed in SONIs Transmission System Seven

Ye ar S tat eme nt .

1.3 TREATMENT OF INTERCONNECTIONIn July 2006, Minister Noel Dempsey TD, then Minister for Communicat ions, Marine and




Woodland 400kV transmission stat ion in Co. Meath and to another converter s tat ion near




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1-3

The project is now ful ly permitted. Design, manufacturing, and construct ion are now

underway in Bri tain and Ire land. Marine instal lat ion works are scheduled to take place in


1.4 DATA MANAGEMENTSystem development is cont inuously evolving. In order to carry out analyses and to update

the network models and appendices for the TFS 2011-2017, the TSO f roze al l data relat ing to

demand, generat ion and the grid at the beginning of July 2010.

Since the data f reeze date, a number of changes in project ions have emerged.

The fo l lowing grid developments have been init iated as projects:

Looping of Barrymore 110 kV stat ion, into Knockraha-Cahir 110kV l ine;

Uprat ing of the Marina-Trabeg 110kV circuit 1 and circuit 2;

Uprat ing of the Coolroe-Ki lbarry 110kV l ine;

Uprat ing of the Cashla-Tynagh 220kV l ine;

Uprat ing of the Prospect-Tarbert 220kV circuit ;

Uprat ing of the But lerstown-Cul lenagh 110kV l ine;

Uprat ing of the Cul lenagh-Dungarvan 110kV l ine;

Uprat ing of the Cul lenagh-Great Is land 220kV l ine;

Uprat ing of the Cul lenagh-Waterford 110kV l ine;

Uprat ing of the Cathaleens Fal l -Srananagh no.1 110kV l ine;

Uprat ing of the Cathaleens Fal l -Golagh T 110kV l ine;

1.5 PUBLICATIONThis TFS is avai lable in pdf format on the EirGrid website ( www.eirgrid.com) . For a hard -

copy vers ion, please send a request to [email protected] . Network data is also avai lable onthe website in e lectronic format.


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2.1 OVERVIEW OF THE ELECTRICITY TRANSMISSION NETWORK

2.2 EXISTING CONNECTIONS WITH NORTHERN IRELAND

2.3 PLANS FOR TRANSMISSION SYSTEM DEVELOPMENT2.4 CONNECTION OF NEW GENERATION STATIONS

2.5 CONNECTION OF NEW INTERFACE STATIONS

2.6 DETAILED NETWORK INFORMATION

THE ELECTRICITYTRANSMISSIONNETWORK02


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2-1

2 THE ELECTRICITY TRANSMISSION NETWORK

2.1 OVERVIEW OF THE ELECTRICITY TRANSMISSION NETWORKThe nat ional gr id plays a vi tal ro le in the supply of e lectr ic i ty, providing the means to

transport power f rom the generators to the demand centres using a system compris ing

400 kV, 220 kV and 110 kV networks. The nat i onal gr id is e lectr ical ly c onnected to the

transmission system of Northern Ire land by means of one 275 kV double c ircuit connect ion

at Louth and two 110 kV connect ions at Letterkenny i n Co. Donegal and Corraclassy in Co.

C avan.

The 400 kV and 220 kV networks form the backbone of the grid. They have higher capacity

and lower losses than the 110 kV network. The 400 kV network provides a high capacity l inkbetween Moneypoint generat ion stat ion and Galway on the west coast and Dubl in on the

east . The 220 kV network comprises a number of s ingle c ircuit loops around the country.

Typical ly lar ge generat ion stat ions (grea ter than 100 MW) are connected to the 220 kV or

400 kV networks.

The 110 kV 1 l ines, which const i tuted the ent ire t ransmission system prior to the 1960s,

provide paral le l paths to the 220 kV system. I t is the most extensive el ement of the grid,

reaching into every county in the Republic of I re land.

The t ransmission system general ly comprises overhead l ines, except in l imited

circumstances, such as in the ci ty centres of Dubl in and Cork, where underground cables

are used. Table 2-1 presents the total lengths of overhead l ines 2 and cables at the di f ferent

voltage levels . Revis ion of individual l ine lengths are subject to conf irmation fo l lowing

complet ion of network development projects .

Table 2-1 Total Length of Exist ing Grid Circuits as at July 01 s t 2010

1 A n u mb e r of r a d i a l 1 1 0 k V l i n e s a r ou n d th e cou n tr y a n d th e 1 1 0 k V l i n e s a n d ca b l e s w i th i n D u b l i nC i t y a r e c u r r e n t l y o p e r a t e d b y t h e D i s t r i b u t i o n S y s t e m O p e r a t o r ( D S O ) . T h e D S O l i c e n c e i s h e l d b yE S B N e t w o r k s . D e t a i l s o f t h e d i s t r i b u t i o n n e t w o r k i n D u b l i n a r e n o t i n c l u d e d i n t h i s T r a n s m i s s i o nF o r e c a s t S t a t e m e n t .2S o m e l i n e s m a y c o n t a i n s h o r t s e c t i o n s o f c a b l e .

Voltage Level Total L ine Lengths (km) Total Cable Lengths (km)

400 kV 439 0

275 kV 42 0

220 kV 1,724 110110 kV 3,922 62


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2-2

Transformers are required to l ink the di f ferent voltage networks, providing paths for power

to f low f rom the higher to the lower voltage networks. The total t ransformer capacity

between the di f ferent voltage levels is presented in Table 2-2.

Table 2-2 Total Grid Transformer MVA Capacity as at July 01 s t 2010 3

Voltage Level Capacity (MVA) Number of t ransformers

400/220 kV 2,550 5

275/220 kV 1,200 3

220/110 kV 9,239 48

React ive compensat ion devices are used to improve network voltages in local areas.

Exist ing react ive devices connected to the grid include shunt capacitors, s tat ic var

compensators (SVCs) and shunt reactors. Table 2-3 shows the total amounts of each type.

Capacitors and SVCs help to support local voltages in areas where low voltages may

otherwise occur. Shunt reactors suppress voltages in areas where they would otherwise be

too high, most l ikely during periods of low demand.

Table 2-3 Total React ive Compensat ion as at July 01 s t 2010 4

Voltage Level Type Capacity (Mvar) Number of devices

400 kV Line Shunt Reactor 160 2

220 kV Shunt Reactor 100 1

110 kV Stat ic Var Compensator 90 3

Switched ShuntC ap ac i t o r

635 28

2.2 EXISTING CONNECTIONS WITH NORTHERN IRELANDAs i l lustrated in F igure 2-1, the nat ional gr id is connected to Northern Ire land via three

275 5/220 kV t ransfor mers in Louth stat ion, one 600 MVA unit and two ganged 6 300 MVA

units , connected to a double c ircuit 275 kV l ine running f rom Louth to Tandragee in Co.

Armagh. In addit ion to the main 2 75/220 kV dou ble c ircui t , there ar e two 110 kV

connect ions, one between Letterkenny in Co. Donegal and Strabane in Co. Tyrone, and the

other between Corraclassy in Co. Cavan and Enniski l len in Co. Fermanagh. The purpose of

these 110 kV circuits is to provide support to e i ther system for certain condit ions or in the

event of an unexpected circuit outage. Phase shif t ing t ransformers in Strabane and

Enniski l len are used to control the power f low under normal condit ions.

3T r a n s f o r m e r d e t a i l s a r e p r o v i d ed i n T a b l e s B - 6 , B - 7 a n d B - 8 i n A p p e n d i x B .4D e t a i l s o f e x i s t i n g r e a c t i v e c o m p e n s a t i o n d e v i c e s a r e p r o v i d e d i n T a b l e B - 1 0 i n A p p e n d i x B .5 T h e t r a n s mi s s i on s ys te m i n N or th e r n I r e l a n d i s op e r a te d a t 2 75 k V a n d 1 1 0 k V.6 P l a n t c o n n e c t e d i n p a r a l l e l t h r o u g h c o m m o n s w i t c h g e a r .


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2-3

While the design capa city of each of the 275/220 kV cr oss-border c ircuit s is 600 MVA, the

actual capacity of the circuits to accommodate t ransfers between the two systems at any

t ime depends on the prevai l ing system condit ions on either s ide of the border, including

the abi l i ty to deal with system separat ion.

F igure 2-1 Exist ing Cross-Border Circuits

2.3 PLANS FOR TRANSMISSION SYSTEM DEVELOPMENTThe Transmission System Operator (TSO) publ ished i ts Draf t Transmission Development Plan

2010 in November 2010, for publ ic consultat ion. The report detai ls the t ransmission

development projects that have been init iated by the TSO in addit ion to a discussion of

further developments that may arise in the period of the plan.

The development plans include projects required to faci l i tate demand growth and new

generat ion and demand connect ions in compliance with the Transmission Planning Cri ter ia

(TPC). The planned network developments presented in this Transmission Forecast

Statement (TFS) are based on those projects that have been selected as opt imum solut ions

to known network problems. Al l information presented on network t ransfer capabil i t ies and

opportunit ies is cont ingent on the complet ion of these development projects in the

assumed t imeframe.

It should be noted that the information presented here is a snap shot of an evolving plan.

Further investment is l ikely to be required before the end of the period of the plan to

maintain standards in al l parts of the network. While the TSO is considering other

reinforcements, these are not at the stage of maturi ty required for inclusion in this

statement. In addit ion, the connect ion of new generat ion or large point demands are l ikely

to have a step change on network performance leading to further development

Louth

Tandragee

LetterkennyStrabane

NorthernIreland

Republicof Ireland

Enniskillen

275kV Lines110kV Lines

Corraclassy

Ballycronanmore

Moyle interconnectorto Scotland

Louth

Tandragee

LetterkennyStrabane

NorthernIreland

Republicof Ireland

Enniskillen

275kV Lines110kV Lines

Corraclassy

Ballycronanmore

Moyle interconnectorto Scotland


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2-4

requirements. The solut ions are l ikely to be a combinat ion of robust s trategic developments

and short term reinforcements to maintain f lexibi l i ty in the system.

The fo l lowing is an overview of the major 400 kV and 220 kV network developments plannedfor the system at the beginning of July 2010, when data was f rozen in order to faci l i tate the

complet ion of the TFS. The Draf t Transmission Development Plan 2010 includes detai ls of

these and of s ignif icant 110 kV reinforcement projects planned for the system. The planned

developments are i l lustrated on a map and on the schematic network diagrams in

Appendix A. New genera t ion connect i ons and new transmission in terface stat ion s are

described in Sect ions 2.4 and 2.5 respect ively.

2.3.1 Flagford-Srananagh 220 kV DevelopmentSrananagh 220 kV stat ion, east of Sl igo town, wi l l be connected to th e 220 kV network by

an overhead l ine f rom F lagford, ne ar Carr ick-on -Shannon, thus extending the 22 0 kV

network into the n orth-west. A number of 11 0 kV l ines wi l l be con nected into the new

stat ion, making Srananagh a new hub for power f lows into the north-west. The F lagford-

Srananagh 220/11 0 kV project is needed to reinfor ce the network in this area of growing

demand, and to reduce the r isk of loss of supply at winter peak and during maintenance

outages. The 110 kV elements of this project were completed in 2009. At the t ime of the

data f reeze, i t was assumed that the 220 kV elements of the project would be due for

complet ion in 2011.

2.3.2 Glanagow-Raffeen 220 kV CircuitThe planned new 220 kV circuit f rom Glanagow to Raf feen in Co. Cork wi l l be part submarine

cable, part underground cable. I t is expected to be completed in 2011.

2.3.3 400 kV line to Northern IrelandA new 400 kV l ine between the nat ional gr id and Northern Ire land is current ly being

progressed by the TSO and Northern Ire land Electr ic i ty (NIE) . The l ine wi l l connect into a

new 400/220 kV stat ion, probably located in Co. Cavan, provis ional ly referred to as the

Mid-Cavan stat ion elsewhere in this TFS.

In the event of a loss of the exist ing 275 kV double c ircuit connect ing the nat ional gr id to

Northern Ire land, the pre- fault t ransfers would be directed across the Letterkenny-Strabane

and Corraclassy-Enniski l len 110 kV cross-border c ircuits . In this instance, to guard against

damage to these l ines, protect ion equipment wi l l switch out the 110 kV circuits result ing in

separat ion of the two systems.

System separat ion, depending on the pre-separat ion f low on the Louth-Tandragee 275 kV

double c ircuit , may result in a generat ion surplus on one system and a def ic i t on the other.


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The system with a supply def ic i t may be required to disconnect demand customers. The

system with the supply surplus may have dif f iculty s tabi l is ing the system f requency. The

impact of potent ial system separat ion on each system can result in constraints on the

amount of power that can be t ransferred between the two systems.

The new circuit wi l l provide an alternat ive high capacity path for power f lows in the event of

the loss of the exist ing circuits . I t wi l l therefore overcome the system separat ion issue and

al leviate constraints on power t ransfers between the two systems. The project is expected

to be completed in 2014.

2.3.4 400 kV line from Woodland to Mid-CavanA 400 kV l ine is planned f rom the exist ing Woodland 400 kV stat ion northwards to the

planned Mid-Cavan 400/220 kV stat ion. Together with the planned 400 kV l ine f rom Mid-

Cavan to Northern Ire land this wi l l further s trengthen the l ink between the two t ransmission

systems. I t is expected to be completed in 2014.

2.3.5 East-West InterconnectorIn July 2006, Minister Noel Dempsey TD, then Minister for Communicat ions, Marine and




Woodland 400kV transmission stat ion in Co. Meath and to another converter s tat ion near



The project is now ful ly permitted. Design, manufacturing, and construct ion are now

underway in Bri tain and Ire land. Marine instal lat ion works are scheduled to take place in


2.3.6 Finnstown 220 kV DevelopmentFinnstown 220 kV stat ion, in west County Dubl in, wi l l be connected into the exist ing

Inchicore-Ma ynooth No. 1 and No. 2 220 kV l ines. A number of the exist ing 110 kV l ines in

the area wi l l be connected to the new F innstown stat ion, ensuring that adequate

inf rastructure is in place to meet the increasing electr ic i ty demand in the West Dubl in area

and reducing the r isk of loss of supply at winter peak and during maintenance outages. This

project is due for complet ion in 2013.


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2-6

2.3.7 Balgriffin 220 kV DevelopmentBalgri f f in 220 kV stat ion, in north County Dubl in, wi l l be connected to the 220 kV network

by an underground cable f rom F inglas. A number of the exist ing 110 kV l ines in the area wi l l

be connected to the new Balgri f f in s tat ion, ensuring that adequate inf rastructure is in place

to meet the increasing electr ic i ty demand in the North East Dubl in area and reducing the

risk of loss of supply at winter peak and during maintenance outages. This project is due

for complet ion in 2014.

2.3.8 Kilpaddoge 220 kV DevelopmentKilpaddoge 220 kV stat ion, in north Co. Kerry, wi l l be connected into the exist ing

Clashavoon-Tarbert and Ki l lonan-Tarbert 220 kV l ines. A number of 110 kV l ines wi l l be

connected into the new stat ion, making Ki lpaddoge a new hub for power f lows into the

south-west. Ki lpaddoge 220/110 kV project is needed to accommodate the planned

generat ion in the south-west and the refurbishment of the exist ing Tarbert 220 kV. This

project is due for complet ion in 2013.

2.3.9 Moneypoint-Kilpaddoge 220 kV CircuitA planned new submarine cable across the Shannon estuary f rom Moneypoint in Co. Clare to

Ki lpaddoge in north Co. Kerry wi l l create a necessary new path for power out of the Dubl in-

Moneypoint group of generators into the south-west and a path for power out of the south-

west to the 400 kV network. I t is expected to be completed in 2013.

2.3.10 Ballyvouskill 220 kV DevelopmentBallyvouski l l 220 kV stat ion wi l l be l ooped into the exist in g Clashavoon-Tarb ert 220 kV

l ine. The stat ion wi l l be l inked to the exist ing Garrow 110 kV stat ion by two new 110 kV

overhead l ines. Bal lyvouski l l 220/110 kV project is needed to accommodate the planned

generat ion in the south-west. This project is due for complet ion in 2014.

2.3.11 Knockanure 220 kV DevelopmentKnockanure 220 kV stat ion wi l l be looped into the exist ing Clashavoon-Tarbert 220 kV l ine.

The stat ion wi l l be looped into the exist ing Tr ien-Tarbert 110 kV circuit and the planned

Trien-Athea 110 kV circuit . Knockanure 220/110 kV project is needed to accommodate the

planned generat ion in the south-west. This project is due for complet ion in 2014.

2.3.12 Kishkeam 220 kV DevelopmentKishkeam 220 kV stat ion wi l l be looped into the exist in g Clashavoon-Tarber t 220 kV l ine.

The stat ion wi l l be l inked to the exist ing Glenlara 110 kV stat ion by a new 110 kV overhead


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2-7

l ine. Kishkeam 220/110 kV project is needed to accommodate the planned generat ion in the

south-west. This project is due for complet ion in 2014.

2.3.13 400 kV station near PortlaoiseA new 400/110 kV substat ion to be located near Port laoise, Co.Laois , with an associated

110 kV circuit to Ki lkenny 110 kV stat ion via Bal lyragget s tat ion. The 400/110 kV substat ion

wil l be looped into the exist ing Moneypoint-Dunstown 400 kV l ine and the exist ing

Port laoise-Car low 110 kV l ine. The proposed inf rastructure wi l l improve qual i ty of supply to

Laois , Carlow, Ki ldare, Wicklow, Ki lkenny, ensure security of supply to Ki lkenny and wil l

also increase capacity to the ent ire region. This project is due for complet ion end 2014 .

2.4 CONNECTION OF NEW GENERATION STATIONSSect ion 4.1 in Chapter 4 describes the future generators that have s igned connect ion

agreements. Table 2-4 shows the connect ion method for these generators.

Table 2-4 Planned Connect ion Methods of Future Generators

Generator Planned Connect ion Method

Athea New Athea 110 kV stat ion tai l -connect ed into Tr ien 110 kV stat ion

A t he a Wi nd F arm( Ext e ns i o n)

Connected into the planned Athea 110 kV stat ion

Bal lakel ly Connected to a new Bal lakel ly 220 kV stat ion, i tsel f tai l -connec ted into

Louth 220 kV stat ionBindoo WindF arm ( Ext e ns i o n)

Connected into the exist ing Ratrussan 110 kV stat ion

Boggeragh New Boggeragh 110 kV stat ion tai l -connecte d into Clashavoon 220 kVstat ion

Boolt iagh WindF arm ( Ext e ns i o n)

Connected into the exist ing Boolt iagh 110 kV stat ion

Cast ledockri l l New Cast ledockri l l 110 kV stat ion tai l -connect ed into Lodgewood 220 kVstat ion

Caulstown Connected to a new Caulstown 110 kV stat ion, i tsel f connected into theexist ing Plat in-Corduf f 110 kV l ine

Cloghboola Connected to a new Knocknagashel 110 kV stat ion; i tsel f tai led intoTrien 110 kV stat ion

Cuil leen Connected to a new Cui l leen 110 kV stat ion, i tsel f tai l -connec ted intoAthlone 110 kV stat ion

Edenderry Connected into the exist ing Cushal ing 110 kV stat ion

G l anl e e Wi ndF arm ( Ext e ns i o n)

Connected into the exist ing Glanlee 110 kV stat ion

Keelderry New Keelderry 110 kV stat ion tai l -connected into Derrybrien 110 kVstat ion


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2-8

Table 2-4 Planned Connect ion Methods of Future Generators (Cont inued)

Generator Planned Connect ion Method

Knockacummer New Knockacummer 110 kV stat ion tai l -connected into Glenlara110 kV stat ion

Moneypoint Connected into exist ing Moneypoint s tat ion at 110 kV

Mulreavy New Mulreavy 110 kV stat ion tai l -connect ed into Cathaleen's Fal l110 kV stat ion

Nore Power Connected to a new Nore 110 kV stat ion, i tsel f tai l -connectedinto Ki lkenny 110 kV stat ion

Suir Connected to a new Suir 110 kV stat ion, i tsel f tai l -connect ed intoCahir 110 kV stat ion

Whitegate Connected to a new Glanagow 220 kV stat ion, i tsel f tai l -connected into Aghada 220 kV stat ion

2.5 CONNECTION OF NEW INTERFACE STATIONSFor the period covered by this s tateme nt, Table 2-5 l is ts the planned new 110 kV stat ions

connect ing the distr ibut ion system or direct ly-connected customers to the grid. These

stat ions are included in the appropriate network models according to their expected

connect ion date. Detai ls of the connect ions and dates are g iven in Sect ion B.2 in

A p p e nd i x B .

Table 2-5 Planned 110 kV Stat ions

Stat ion Code Nearest Main Town or

Lo ad C e nt re

County

Adamstown ADM Lucan Dubl in

Ardnagappary AGY Na Doir i Beaga Dun na nGal l

Bal lycummin BCM Raheen Limer ick

Bal lyragget BGT Bal lyragget Ki lkenny

Banoge BOG Gorey Wexford

Bracklone BRA Portarl ington Laois

Carrowbeg CBG Westport Mayo

Cherrywood CHE Loughl instown Dublin

Hartnett 's Cross HTS Macroom Cork

Nenagh NEN Nenagh T ipperary

R al ap anne R A L R al ap anne K e rry

Screeb SCR Camus Iochtar Gal l imh


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2-9

2.6 DETAILED NETWORK INFORMATIONFigure A-1 in Appendix A presents a geographical map of the grid at the beginning of July

2010. This is also avai lable in A3 format in Appendix K.

The electr ical characterist ics and capacity rat ings of the exist ing network are included in

the fo l lowing tables in Sect ion B.1 of Appendix B.

Tables B-2 to B-5 l is t the electr ical characterist ics of the exist ing overhead l ines and

underground cables at the di f ferent voltage levels . The rat ings are shown in MVA for winter

and for summer reference temperature condit ions, 5 C and 25C respect ively.

Tables B-6 to B-8 l is t data for each exist ing t ransmission t ransformer. The data includes

impedance values, nameplate rat ings and tap ranges. The voltage tapping range for eachtransformer is g iven as the percentage deviat ion f rom the nominal voltage rat io at the two

extreme tap posit ions.

Table B-9 l is ts detai ls of the phase shif t ing t ransformer at Carr ickmines 220 kV stat ion.

Table B-10 includes the Mvar capacity data for exist ing react ive compensat ion devices.

F igure A-2 in Appendix A presents a geographical map of the grid as forecast in 2017,

including the planned developments. The schematic network diagrams in Appendix A show

snapshots of the exist ing grid and planned developments at the end of 2010, 2011, 2014

and 2017. The diagrams indicate stat ions, c ircuits , t ransformers, generat ion, react ivedevices and phase shif t ing t ransformers.

The electr ical characterist ics and capacity rat ings of planned network developments are

included in the fo l lowing tables in Sect ion B.2 of Appendix B.

Tables B-11 to B-15 contain data for new l ines and cables and planned changes to exist ing

l ine and cable data on an annual basis . These tables include a column to indicate whether

each l is ted i tem of plant is being added, amended or deleted. Changes relat ing to a

part icular development project are grouped together and headed by a project descript ion

which includes the Capital Project (CP) number.

Tables B-16 to B-20 l is t the detai ls of the planned network t ransformers.

Tables B-21 to B-23 include the Mvar capacity data for planned react ive compensat ion

devices.

Electr ical characterist ics of future t ransmission plant or changes to the electr ical

characterist ics brought about by planned developments are prel iminary. Electr ical

characterist ics wi l l be reviewed when the plant is commissioned.


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3.1 FORECASTS OF TRANSMISSION PEAKS

3.2 COMPARISON WITH PREVIOUS DEMAND FORECAST

3.3 FORECAST DEMAND AT TRANSMISSION INTERFACE STATIONS

3.4 DEMAND PROFILES

DEMAND

03


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3-1

3 DEMANDThe f low of power on the grid is determined largely by the generat ion feeding into i t and the

demand that is drawn f rom it . This chapter deals with forecasts of the total peak demand on

the t ransmission network, and of demand at individual t ransmission-connected stat ions.

The All - is land Generat ion Capacity Statement 2011-2020 (GCS), publ ished by the EirGrid and

SONI in December 2010, contains forecasts of future energy consumption and demand for

the ten-year period to 2020.

3.1 FORECASTS OF TRANSMISSION PEAKSTable 3-1 presents the forecasts of t ransmission demand for the seven years 2011 to 2017,

as they were expected to be publ ished in the GCS. I t should be noted that these forecasts

were the best avai lable project ions during the preparat ion of this s tatement. Ult imately,

the f igures publ ished in the GCS 2011-2020 may dif fer s l ight ly.

While i t is di f f icult to accurately predict a peak demand f igure for a part icular year, the

forecasts in Table 3-1 may be taken as indicat ive of a general t rend in demand growth.

Three demand values are presented for each year: the winter peak, the summer peak and

the summer val ley.

Table 3-1 Transmission Demand Forecast , MW

Year S ummer Peak Su mme r Val le y Winte r Peak

2011 3 ,779 1,701 4,724

2012 3,850 1,733 4,813

2013 3,942 1,774 4,927

2014 4,037 1 ,817 5 ,046

2015 4,135 1 ,861 5 ,169

2016 4,184 1,883 5,230

2017 4,234 1,905 5,292

The winter peak f igures represent the expected annual peak demands that are forecast to

occur in the October to February winter period of each year e.g ., the 2011 forecast of

4,724 MW is the maxi mum demand projec ted to occur in winter 2010/11. These peak

forecasts take account of the inf luence of demand-s ide management (DSM) schemes, such

as the TSOs winter peak demand reduct ion scheme (WPDRS). In winter 2009/10, DSM

accounted for approximately 120 MW of a reduct ion to the peak demand. This amount of

DSM is assumed to cont inue over the next e ight years.

The summer peak refers to the average peak value between March and September. This is

typical ly 20% lower than the winter peak. While the overal l gr id power f low may be lower in

summer than in winter, this may not be the case for f lows on al l c i rcuits . In addit ion, the


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3-2

capacity of overhead l ines is lower because of higher ambient temperatures, while network

maintenance, normally carr ied out in the March to September period, can weaken the

network, further reducing i ts capabil i ty to t ransport power.

The annual minimum is referred to as the summer val ley in this TFS. Summer val ley cases

examine the impact of less demand and less generat ion dispatched. This minimum

condit ion is of part icular interest when assessing the capabil i ty to connect new generat ion.

With local demand at a minimum, the connect ing generator must export more of i ts power

across the grid than at peak t imes. The forecasts of summer val ley demands in Table 3-1

assume a f igure of 36% of the annual maximum demand, which is consistent with historical

summer val ley demand data.

3.1.1 Peak Out-turn for Winter 2009/10The peak exported demand in winter 2009/10 was 4,922 MW. This f igure is 368 MW lower

than the t ransmission peak forecast for winter 2009/10 of 5 ,290 MW presented in

Transmission Forecast Statement 2008-2014 . At the t ime of peak the product ion f rom wind

generat ion was 83 MW. The peak f igure indicates the di f f iculty in accurately predict ing the

maximum demand in a part icular year. Peak demands may be higher or lower than forecast

depending on factors such as weather condit ions and customer behaviour. The TSO wil l

cont inue to monitor future peaks and adjust i ts forecasts accordingly.

3.2 COMPARISON WITH PREVIOUS DEMAND FORECASTTable 3-2 compares the winter peak t ransmission demand forecasts in this TFS with those

g i ve n i n Transmission Forecast Statement 2010-2016. The current demand forecasts ref lect

an average increase in winter peak demand of 2.0% over the period 2011 to 2017. This

corresponds to that expected in Transmission Forecast Statement 2010-2016. As such, the

peak project ions to 2017 are s imilar for the same years in Transmission Forecast Statement

2010-2016.

Table 3-2 Comparison of Peak Demand Forecast with Previous TFS, MW

2011 2012 2013 2014 2015 2016 2017

TFS 2011-2017 4,724 4,813 4,927 5 ,046 5,169 5,230 5,292

TFS 2010-2016 4,725 4,848 4,941 5 ,037 5 ,134 5,233 N/A

Dif ference -1 -35 -14 9 35 -3 N/A

3.3 FORECAST DEMAND AT TRANSMISSION INTERFACE STATIONSTransmission interface stat ions are the points of connect ion between the t ransmission

system and the distr ibut ion system, or direct ly-connected customers. These are most ly

110 kV stat ions. In Dubl in c i ty, where the Distr ibut ion System Operator (DSO) operates the

110 kV network, the interface is usual ly at 220 kV stat ions.


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3-3

Appendix C l is ts the forecast demands at each t ransmission interface stat ion at t ime of

winter peak, summer peak and summer val ley for al l years f rom 2011 to 2017. Demand

project ions at individual t ransmission stat ions are developed f rom the system demand

forecasts on a top-down basis . The forecast ing process includes regular monitoring and

review of t rends in consumption in al l parts of the country. The al locat ion of the system

demand forecast to each stat ion is based pro-rata on an up-to-date measurement of actual

peak demand at each stat ion. Account is taken of planned transfers of demand between

stat ions as agreed with the DSO. In this way, changes in the geo-divers ity of e lectr ic i ty

consumption are captured. This process provides a stat ion demand forecast and by

extension a regional demand forecast for the short to medium term.

The system-wide demand forecasts, presented in Table 3-1, include t ransmission losses

whereas the individual s tat ion demand forecasts do not. Transmission losses therefore

account for the di f ference between the system-wide demand forecasts and the sum of the

forecasts at each interface stat ion in Appendix C.

Demand forecasts for the small number of direct ly-connected customers are the current best

est imates of requirements. In some cases, the est imates may be less than contracted

Maximum Import Capacity (MIC) values, but are chosen to g ive a better project ion of

expected demand on a system-wide basis . However, when analys ing the capacity for new

demand in a part icular area, the MIC values of local direct ly-connected customers are

assumed to ensure that the contracted MIC is reserved.

Although demand-side management schemes are expected to reduce some industr ies '

demands over winter peak hours, their normal demand levels are included in the winter

peak demand forecasts shown in Table C-1 in Appendix C and are used in the power f low

diagrams in Appendix J , as they are more indicat ive of general power f lows.

3.4 DEMAND PROFILESElectr ic i ty usage fo l lows some general ly accepted patterns. For example, annual peak

demand occurs between 17.00 and 19.00 on winter weekday evenings, while minimum usage

occurs during summer weekend night- t ime hours. F igure 3-1 shows the prof i le for theweekly peaks across the year for 2009.

F igure 3-2 presents four dai ly demand prof i les that indicate how electr ic i ty usage varies

throughout the day. The demand prof i les are for the day on which the annual peak occurred

in Winter 2009/2010 as wel l as prof i les for typical summer and winter weekdays and for the

minimum demand day. The prof i les, with demand levels ranging f rom approximately

1,664 MW to 4,863 MW, indicate tha t the power system deals with a wi de variat ion i n

demand throughout the year. Even within the day demand variat ions are substant ial .


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3-4

Figure 3-2 i l lustrates that on the winter peak day the peak demand is almost twice the

minimum demand on that day, a variat ion of over 2,207 MW. A number of points on this

diagram, the winter peak (WP), typical summer peak (SP) and summer val ley (SV) demands,

are examined in the analyses undertaken for this TFS.

3200

3400

3600

3800

4000

4200

4400

4600

4800

5000

0 5 10 15 20 25 30 35 40 45 50 55

P

DmaMW)

Week

F igure 3-1 Weekly Peak Values for Year 2009

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

0 6 12 18 24

E

eDmaMW)

HourWinter Peak Typ ic al Winter Typic al Summer Summer Minimum

WP

SP

SV

F igure 3-2 Dai ly Demand Prof i les for Year 2009


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4.1 EXISTING AND PLANNED GRID-CONNECTED GENERATION

4.2 PLANNED RETIREMENT/DIVESTITURE OF GENERATION PLANT

4.3 EMBEDDED GENERATION

4.4 WIND GENERATION

GENERATION

04


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4-1

4 GENERATIONThis chapter g ives information about exist ing generat ion capacity and project ions for the

seven years to 2017. Al l generat ion capacity and dispatch f igures in this Transmission

Forecast Statement (TFS) are expressed in exported or net terms i .e. , generat ion unit output

less the unit s own auxi l iary load.

On the 01 s t of July 2010, when data was f rozen in order to permit TFS analyses to be carr ied

out, some 8,027 MW (net) of generat ion capacity was instal led in the Republic of I re land. Of

this 7,180 MW is connected to the nat ional gr id and 847 MW is connected direct ly to the

distr ibut ion system. Sect ions 4.1 to 4.4 detai l planned developments with respect to

generat ion over the period covered by this TFS.

4.1 EXISTING AND PLANNED GRID-CONNECTED GENERATIONThe 7,180 MW f igure for gr id-connected generat ion capacity includes generators that

connected to the grid in 2009/2010, namely the Lisheen Wind Farm in Co. T ipperary

(55 MW), Aghada CCGT in Co. Cork (431 MW) and Boggeragh Wind Farm in Co. Cork (57 MW).

Current ly, 19 contracts have been s igned, agreeing to connect a total generat ion capacity of

1 ,850 MW to the grid. These planned generators are l is ted in Table 4-1 with their expected

connect ion dates as at the t ime of the data f reeze.

Table 4-1 Planned Grid-Connected Generat ion as at July 01s t

2010

Generator Descript ion Expected

Connect ion

Date

Edenderry 116 MW Peaking Plant in Co. Of faly Jul -10

Whitegate 445 MW CCGT in Co. Cork Aug-10

G l anl e e Wi nd F arm

( Ext e ns i o n)

6 MW wind farm extension in Co. Cork Sep-10

Cast ledockri l l 41.4 MW wind farm in Co. Wexford Dec-10

A t he a Wi nd F arm

( Ext e ns i o n)

22 MW wind farm extension in Co. L imerick Feb-11

Boolt iagh Wind Farm

( Ext e ns i o n)

12 MW wind farm extension in Co. Clare Mar-11

Bindoo Wind Farm

( Ext e ns i o n)

22 MW wind farm extension in Co. Cavan Jul -11

Nore Power 98 MW OCGT in Co. Ki lkenny Sep-11


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4-2

Table 4-1 Planned Grid-Connected Generat ion as at July 01 s t 2010 (Cont inued)

Generator Descript ion Exp e c t e d

C o nne c t i o n

D at e

Athea 51 MW wind farm in Co. L imerick Oct-11

Moneypoint Wind Farm 21.9 MW wind farm located at Moneypoint coal-

f i red power stat ion in Co. Clare

A p r - 1 2

Bal lakel ly 445 MW CCGT in Co. Louth May-12

Keelderry 29.8 MW wind farm in Co. Galway Jun-12

Suir 98 MW OCGT in Co. T ipperary Jun-12

Caulstown 58 MW OCGT in Co. Meath Nov-12

Cuil leen 98.4 MW OCGT in Co. West Meath Dec-12

Mulreavy 82 MW wind farm in Co. Donegal Jul -13

Cloghboola 46 MW wind farm in Co. Kerry Feb-14

Knocknagreenan 70 MW pumped storage unit in Co. Cork May-14

Knockacummer 87 MW wind farm in Co. Cork Jul -14

4.2 PLANNED RETIREMENT/DIVESTITURE OF GENERATION PLANTThe divest i ture or c losure of generat ion plant could have a s ignif icant impact on the abi l i ty

of the grid to comply with standards. Under the Grid Code, a minimum of 24 months not ice

is required by the TSO to address the potent ial implicat ions of any generat ion closures.

I t was announced in November 2006 that an agreement had been reached between ESB and

the CER to reduce ESBs share of the electr ic i ty market . Under the terms of the agreement

ESB had to c lose or divest 1 ,300 MW of plant by 2010.

The Aghada peaking unit has t ransferred to Tawnaghmore. Connect ion agreements have

been s igned with the DSO to the ef fect that two 52 MW peaking units wi l l become DSO

costumers, connected at Tawnaghmore.

ESB Power Generat ion conf irmed the closure of Poolbeg Units 1 , 2 and 3. The steam turbine

at Marina ceased operat ion in March 2010.

Endesa has purchased Great Is land and Tarbert generat ion stat ions as wel l as Rhode and

Tawnaghmore peaking plants f rom ESB.


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4-3

4.3 EMBEDDED GENERATIONOn the 01 s t of July 2010, there was approximately 847 MW of embedded generat ion plant

i .e. , plant connected to the distr ibut ion system or to the system of a direct ly-connected

demand customer. This f igure comprises combined heat and power (CHP) schemes, small

industr ial thermal units and renewable generat ion f rom wind, small hydro, land-f i l l gas

(LFG) and biomass sources. Table 4-2 l is ts the exist ing embedded generat ion capacity totals

by generat ion type. Table D-3 in Appendix D provides detai ls of the exist ing embedded wind

farms and their capacit ies.

Table 4-2 Exist ing Embedded Generat ion as at July 01 s t 2010, MW

Wi nd S m al l

H yd ro

Biomass/

LFG

CHP Industr ial Peaking TOTAL

Net Capacity( M W)

555 21 37 121 9 104 847

Embedded generators reduce the demand suppl ied through the t ransmission interface

stat ions. Forecasts of demand at the relevant t ransmission interface stat ions, presented in

Table 3-1 of Chapter 3 , take account of the contr ibut ion of the exist ing non-wind embedded

generators 9. The All - is land Generat ion Capacity Statement 2011-2020 (GCS) forecasts the

total CHP and non-wind renewable capacity to grow by about 5 MW per year. I t should be

noted that these forecasts were the best avai lable project ions during the preparat ion of

this s tatement. Ult imately, the f igures publ ished in the GCS 2011-2020 may dif fer s l ight ly.

As at the 01 s t of July 2010, 2 convent ional generators, total l ing 89 MW have s igned

connect ion of fers and are committed to connect ing to the distr ibut ion network over the next

few years. Table 4-3 shows the total amount of committed convent ional generat ion capacity

expected to connect to the distr ibut ion network.

Table 4-3 Committed Embedded Generat ion as at July 01 s t 2010, MW

Generator Descript ion Expected

Connect ion

DateDrybridge 17 MW Waste to Energy generator in Co. Meath Feb-11

Ringsend 72 MW Waste to Energy generator in Co. Dubl in Jun-13

9 B e c a u s e o f t h e v a r i a b i l i t y o f w i n d , a f i x e d c o n t r i b u t i o n f r o m e m b e d d e d w i n d f a r m s i s n o t t a k e n i n t oa c c o u n t i n t h e c a l c u l a t i o n o f t h e p e a k t r a n s m i s s i o n f l o w f o r e c a s t s. R a t h e r a n u m b e r o f w i n d

s c e n a r i o s a r e c o n s i d e r e d i n t h e T F S a n a l y s e s .


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4-4

4.4 WIND GENERATIONOver the past two decades wind power generat ion in the Republic of I re land has increased

from 6 MW (one wind farm) to 1 ,520 MW (123 wind farms) at the beginning of July 2010.

F igure 4-1 shows the exist ing and planned transmission-connected, distr ibut ion-connected

and the total connected wind power capacity at year end f rom 1992 to 2017. The graph

il lustrates the increase in wind power in recent years.

F igure 4-1 Growth in Wind Capacity, 1992 to 2017

As at the 01 s t of July 2010, 72 wind farms total l ing 1 ,042 MW have s igned connect ion of fers

and are committed to connect ing to the t ransmission or distr ibut ion networks over the next

few years. Table 4-4 shows the total amount of exist ing and committed wind generat ion

capacity expected to be connected at the end of each year f rom the exist ing s i tuat ion at the

end of 2010 to 2017. The individual wind farm detai ls are included in Appendix D.

Table 4-4 Exist ing and Committed Wind Capacity Totals , MW

Connect ion 2010 2011 2012 2013 2014 2015 2016 2017

Transmission 966 1,000 1,052 1,134 1,180 1,180 1,180 1,180

Distr ibut ion 839 1120 1293 1293 1383 1383 1383 1383

Total 1 ,805 2,120 2,345 2,427 2,563 2,563 2,563 2,563At the t ime of the data f reeze, a total of 566 appl icat ions for wind farm connect ions

total l ing 16,883 MW had been received by the TSO and DSO.


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4-5

In the period 2010-2011 3 ,989 MW of wind generat ion and 1,314 MW of convent ional

generat ion wi l l have received of fers under Gate 3 . F igure 4-2 and Table 4-5 i l lustrate how

Gate 3 generat ion is distr ibuted across the country.

Table 4-5 Gate 3 Generat ion Area Totals

B

A

G

E

F

D H1

H2

B

E

H1 H2

I

K

F

G

D

J

C

A

F igure 4-2 Gate 3 Wind Generat ion Areas

Gate 3 Area

Total

Generat ion

(MW)

A (North West) 279

B (Mid North West) 1 ,118

C (Midlands) 223

D (Mid West) 121

E (South West) 1 ,

Documents

Transmission Forecast Statement 2011-2017-Web Version2