NA

TIO

NA

L G

RID

SH

E T

RA

NS

MIS

SIO

NS

P T

RA

NS

MIS

SIO

N

400kV Circuit275kV Circuit132kV Circuit

400kV Substation275kV Substation132kV Substation

Legend

Note: Not all radial 132kV circuits are indicated on this diagram

1

2

2

MEDWAY

1 2

1

2

1

1

BANK

1 2

1 2

1

2

1 2

1 2

BRIDGWATER

1

2

1 2

CHICKERELL

1

2

2

1

DRAKELOW

1 2

1

11

2

22

STALYBRIDGE

1

2

2

1WASHWAYFARM

PENWORTHAM1

2

FFESTINIOG

SEABANK

1 2

1

1

22

CHESTERFIELD

STAYTHORPE

1 2

12HACKNEY

1 1WIMBLEDON

22LITTLEBROOK

HURST

NEW CROSS

RASSAU

1

1

2

2

WYLFA

PENTIR

DINORWIG

CARDIFFEAST

E de F

1

1 1 1 1212

2 2 2 2BOLNEY NINFIELD DUNGENESS SELLINDGE

(270kV DC)

INDIANQUEENS EXETER

AXMINSTERMANNINGTON NURSLING

FAWLEY

LOVEDEAN

OCKER

BISHOPSWOOD

1

1

RUGELEY

LEGACY

1

1

1

112

2

2

2 2

2

2

2

COVENTRY

HAMSHALL

1

IRONBRIDGE

PENN

BUSHBURY

HILL

WILLENHALL

CELLARHEAD

FECKENHAM BERKSWELL

NECHELLS

BUSTLEHOLM

OLDBURY

KITWELL

ON SOAR

RATCLIFFE

1

2

WILLINGTON EAST

1

2

TRAWSFYNYDD

DEESIDE

HUMBER

GRIMSBYWEST

1 2

NEEPSEND

FERRYBRIDGE

RAINHILL

1

1

1

1

1

1

1

1

1

1

22

2

2

2

2

22

2

2

2

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

3 4

ALDWARKE

THURCROFT

BRINSWORTH

DAINES

PADIHAM

BRADFORDWEST

KIRKSTALL

SKELTONGRANGE

ELLAND

ROCHDALE

WHITEGATE

KEARSLEY

STOCKSBRIDGE

POPPLETON

MONKFRYSTON

OFFERTONBOLDON

WEST

HUTTONHEYSHAM

KIRKBY

LISTERDRIVE

BIRKENHEAD

FIDDLERS

FERRY

FRODSHAM

CAPENHURST

TYNEMOUTH SOUTHSHIELDS

1

1

1

1

1

1

1

12

2

2

2

2

2

2

2

HIGH

PITSMOOR

JORDANTHORPENORTON LEES

WINCOBANK

TEMPLEBOROUGH

SHEFFIELDCITY

SOUTHMANCHESTER

MACCLESFIELD

BREDBURY

EGGBOROUGH

DRAX

KEADBY

WEST BURTON

COTTAM

MARNHAM

THORPEMARSH

WEST MELTON

BOTLEYWOOD

1

2

BARKING

1

2

21

1

11

1

1

1

2

2

2

2

2

2

2

2

2

1 1

1

1

1

BRAINTREE

2

2

22

2

EATONSOCON

NORWICHMAIN

BURWELLMAIN

PELHAM

RYE HOUSE

SUNDONWYMONDLEYMAIN

GRENDON

ENDERBY

1

2

2

HINKLEYPOINT

TREMORFA

TAUNTON

1

1

1

1

1 1

1

1

1 1 1 1

1

1

1

1

1

1

1

1

2

21

W E

34

1

12

2

IVER WATFORDSOUTH

LALEHAM

EALINGWILLESDEN

2

1

WEST

WEYBRIDGE

DIDCOT

1

2

COWLEY

WALHAM

CILFYNYDD CULHAM JET

MAINAMERSHAM

WHITSON

UPPERBOAT

IRON

IMPERIALPARK

ACTON

MINETY

MELKSHAM BRAMLEY

FLEET

TOTTENHAM

ST.JOHNSWOOD

ROAD

WALPOLE

BRAMFORD

PEMBROKE

COWBRIDGE

ABERTHAW

ALVERDISCOTT

1

1

1

2

2

2

2

2

1

BEDDINGTON

CHESSINGTON1

2

2

ROWDOWN

22

2

2 2 2 2

2

2

22

2

1

TILBURY

2

2

2

2

2

2

BARKINGREDBRIDGE

BRIMSDOWN

SIZEWELL

WALTHAMCROSS

WARLEYELSTREE

MILL HILL

SHREWSBURY

PATFORDBRIDGE

EASTCLAYDON

LEIGHTONBUZZARD

KILLINGHOLME

12

GRAIN

NORTHFLEET

RAYLEIGH MAIN

CORYTON

EAST

LANDULPH

ABHAM

1

2

THORNTON

21

SPALDINGNORTH

CITY

LANGAGE

1

1

MARCHWOOD

2

1

2 1

3

BRITNED

1

2

1

BICKERFENN

1 2

USKMOUTH

21

HARKER2

1

FOURSTONES BLYTH

21

KINGSNORTH

SINGLEWELL

1 2

WESTHAM

WEST THURROCK

1

2

HARTMOOR

HARTLEPOOL

HAWTHORNPIT

STOKEBARDOLPH

EIRGRID

OSBALDWICK

NORTON

SPENNYMOOR

1

2

STELLAWEST

BECK

SALTEND

CREYKE

HUMBER

NORTH

HEDON

SALTEND

REFINERYSOUTH

MARGAM

PYLE

SALTHOLME

BAYBAGLAN

1

SWANSEA NORTH

TOD POINT

BODELWYDDAN

CARRINGTON

1 2

GREYSTONES

LACKENBY

STANAH

CANTERBURYNORTH

2

CLEVEHILL

1

KEMSLEY

MOYLE

FRASERBURGH

STRICHENST. FERGUS MOBIL

ST. FERGUS GASPETERHEAD GRANGE

MOSSMORRAN

MILTON OF CRAIGIE

GLENROTHES

WESTFIELD

FIDDES

DEVONSIDE

CRAIGIEBUCKLER

WESTFIELD

ABERNETHY

BRECHIN GRID

COUPAR ANGUS

BURGHMUIR

GLENNISTON

CHARLESTON

STIRLING

TARLAND

ARBROATH

LEVEN CUPAR

TEALING

RED HOUSE

PERSLEY

PETERHEAD

DUNLAWEXTENSION

AYR

INVERNESS

WHITELEE EXT

CLYDE NORTH

MEADOWHEADKILWINNING

KNOCKNAGAEL

FOYERS

AN SUIDHE

CLYDE SOUTH

CRUACHAN

DALMALLY

PORT ANN

HAGGS ROAD

ERSKINE

DUNVEGAN

CARRADALE

AUCHENCROSH

FERNOCH

GRETNA

ELVANFOOT

COALBURN

TONGLAND

HAWICK

GALASHIELS

DUMFRIES

ECCLES

CHAPELCROSS

INVERARNAN

CRYSTAL RIG

NEILSTON

NEWARTHILL

MAYBOLE

LONGANNET

KINTORE

KINCARDINE

KILMARNOCK SOUTH

KILLIN

KENDOON

KEITH

KAIMES

INVERARAY

HUNTERSTON

HADYARD HILL

GRANGEMOUTH

GLENLEE

WINDYHILL

EAST KILBRIDE SOUTH

WINDYHILL

WISHAW

FORT AUGUSTUS

FASNAKYLE

ERROCHTY

EASTERHOUSE

DEVOLMOOR

DEVOLMOOR

CURRIE

CHARLOTTE STREET

WHITELEE

KILMARNOCK SOUTH

COATBRIDGE

BLACKLAW

GLENFARCLAS

WHISTLEFIELD

DUNOON

TAYNUILT

FORT WILLIAM

BRAEHEAD PARK

BONNYBRIDGE

BLACKHILLOCK

BEAULY

TORNESS

LAMBHILL

HELENSBURGH

DOUNREAY

BLACKLAW

GOVAN

COYLTON

COCKENZIE

CLYDE'S MILL

BUSBY

PORT DUNDAS

WEST GEORGE STREET

PAISLEY

BROADFORD

GIFFNOCK

EAST KILBRIDE

DRUMCHAPEL

DALLAS

PORTOBELLO

WHITEHOUSE

SHRUBHILLDEWAR PLACESIGHTHILL

BRACO

GLENLUCE

STRATHLEVEN

STRATHAVEN

SMEATON

SLOY

SHIN

NEWTON STEWART

DALMARNOCK

GLENDOE

EDINBANE

MARK HILL

ARDMORE

ALNESS

BRORA DUNBEATH

MYBSTER

THURSO

FARRWIND FARM

ORRIN

LUICHART

MOSSFORD

GRUDIEBRIDGE

KILMORACK

AIGAS

CULLIGRAN

DEANIE

LAIRG

CASSLEY

BOAT OFGARTEN

NAIRN ELGIN

INVERKIP

HUNTERSTON

MOFFAT

FALLAGO

Figure A1.3: GB Existing Transmission System

NA

TIO

NA

L G

RID

SH

E T

RA

NS

MIS

SIO

NS

P T

RA

NS

MIS

SIO

N

400kV Circuit275kV Circuit132kV Circuit

400kV Substation275kV Substation132kV Substation

Legend

Note: Not all radial 132kV circuits are indicated on this diagram

1

2

2

MEDWAY

1 2

1

2

1

1

BANK

1 2

1 2

1

2

1 2

1 2

BRIDGWATER

1

2

1 2

CHICKERELL

1

2

2

1

DRAKELOW

1 2

1

11

2

22

STALYBRIDGE

1

2

2

1WASHWAYFARM

PENWORTHAM1

2

FFESTINIOG

SEABANK

1 2

1

1

22

CHESTERFIELD

STAYTHORPE

1 2

12HACKNEY

1 1WIMBLEDON

22LITTLEBROOK

HURST

NEW CROSS

RASSAU

1

1

2

2

WYLFA

PENTIR

DINORWIG

CARDIFFEAST

E de F

1

1 1 1 1212

2 2 2 2BOLNEY NINFIELD DUNGENESS SELLINDGE

(270kV DC)

INDIANQUEENS EXETER

AXMINSTERMANNINGTON NURSLING

FAWLEY

LOVEDEAN

OCKER

BISHOPSWOOD

1

1

RUGELEY

LEGACY

1

1

1

112

2

2

2 2

2

2

2

COVENTRY

HAMSHALL

1

IRONBRIDGE

PENN

BUSHBURY

HILL

WILLENHALL

CELLARHEAD

FECKENHAM BERKSWELL

NECHELLS

BUSTLEHOLM

OLDBURY

KITWELL

ON SOAR

RATCLIFFE

1

2

WILLINGTON EAST

1

2

TRAWSFYNYDD

DEESIDE

HUMBER

GRIMSBYWEST

1 2

NEEPSEND

FERRYBRIDGE

RAINHILL

1

1

1

1

1

1

1

1

1

1

22

2

2

2

2

22

2

2

2

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

3 4

ALDWARKE

THURCROFT

BRINSWORTH

DAINES

PADIHAM

BRADFORDWEST

KIRKSTALL

SKELTONGRANGE

ELLAND

ROCHDALE

WHITEGATE

KEARSLEY

STOCKSBRIDGE

POPPLETON

MONKFRYSTON

OFFERTONBOLDON

WEST

HUTTONHEYSHAM

KIRKBY

LISTERDRIVE

BIRKENHEAD

FIDDLERS

FERRY

FRODSHAM

CAPENHURST

TYNEMOUTH SOUTHSHIELDS

1

1

1

1

1

1

1

12

2

2

2

2

2

2

2

HIGH

PITSMOOR

JORDANTHORPENORTON LEES

WINCOBANK

TEMPLEBOROUGH

SHEFFIELDCITY

SOUTHMANCHESTER

MACCLESFIELD

BREDBURY

EGGBOROUGH

DRAX

KEADBY

WEST BURTON

COTTAM

MARNHAM

THORPEMARSH

WEST MELTON

BOTLEYWOOD

1

2

BARKING

1

2

21

1

11

1

1

1

2

2

2

2

2

2

2

2

2

1 1

1

1

1

BRAINTREE

2

2

22

2

EATONSOCON

NORWICHMAIN

BURWELLMAIN

PELHAM

RYE HOUSE

SUNDONWYMONDLEYMAIN

GRENDON

ENDERBY

1

2

2

HINKLEYPOINT

TREMORFA

TAUNTON

1

1

1

1

1 1

1

1

1 1 1 1

1

1

1

1

1

1

1

1

2

21

W E

34

1

12

2

IVER WATFORDSOUTH

LALEHAM

EALINGWILLESDEN

2

1

WEST

WEYBRIDGE

DIDCOT

1

2

COWLEY

WALHAM

CILFYNYDD CULHAM JET

MAINAMERSHAM

WHITSON

UPPERBOAT

IRON

IMPERIALPARK

ACTON

MINETY

MELKSHAM BRAMLEY

FLEET

TOTTENHAM

ST.JOHNSWOOD

ROAD

WALPOLE

BRAMFORD

PEMBROKE

COWBRIDGE

ABERTHAW

ALVERDISCOTT

1

1

1

2

2

2

2

2

1

BEDDINGTON

CHESSINGTON1

2

2

ROWDOWN

22

2

2 2 2 2

2

2

22

2

1

TILBURY

2

2

2

2

2

2

BARKINGREDBRIDGE

BRIMSDOWN

SIZEWELL

WALTHAMCROSS

WARLEYELSTREE

MILL HILL

SHREWSBURY

PATFORDBRIDGE

EASTCLAYDON

LEIGHTONBUZZARD

KILLINGHOLME

12

GRAIN

NORTHFLEET

RAYLEIGH MAIN

CORYTON

EAST

LANDULPH

ABHAM

1

2

THORNTON

21

SPALDINGNORTH

CITY

LANGAGE

1

1

MARCHWOOD

2

1

2 1

3

BRITNED

1

2

1

BICKERFENN

1 2

USKMOUTH

21

HARKER2

1

FOURSTONES BLYTH

21

KINGSNORTH

SINGLEWELL

1 2

WESTHAM

WEST THURROCK

1

2

HARTMOOR

HARTLEPOOL

HAWTHORNPIT

STOKEBARDOLPH

EIRGRID

OSBALDWICK

NORTON

SPENNYMOOR

1

2

STELLAWEST

BECK

SALTEND

CREYKE

HUMBER

NORTH

HEDON

SALTEND

REFINERYSOUTH

MARGAM

PYLE

SALTHOLME

BAYBAGLAN

1

SWANSEA NORTH

TOD POINT

BODELWYDDAN

CARRINGTON

1 2

GREYSTONES

LACKENBY

STANAH

CANTERBURYNORTH

2

CLEVEHILL

1

KEMSLEY

MOYLE

FRASERBURGH

STRICHENST. FERGUS MOBIL

ST. FERGUS GASPETERHEAD GRANGE

MOSSMORRAN

MILTON OF CRAIGIE

GLENROTHES

WESTFIELD

FIDDES

DEVONSIDE

CRAIGIEBUCKLER

WESTFIELD

ABERNETHY

BRECHIN GRID

COUPAR ANGUS

BURGHMUIR

GLENNISTON

CHARLESTON

STIRLING

TARLAND

ARBROATH

LEVEN CUPAR

TEALING

RED HOUSE

PERSLEY

PETERHEAD

DUNLAWEXTENSION

AYR

INVERNESS

WHITELEE EXT

CLYDE NORTH

MEADOWHEADKILWINNING

KNOCKNAGAEL

FOYERS

AN SUIDHE

CLYDE SOUTH

CRUACHAN

DALMALLY

PORT ANN

HAGGS ROAD

ERSKINE

DUNVEGAN

CARRADALE

AUCHENCROSH

FERNOCH

GRETNA

ELVANFOOT

COALBURN

TONGLAND

HAWICK

GALASHIELS

DUMFRIES

ECCLES

CHAPELCROSS

INVERARNAN

CRYSTAL RIG

NEILSTON

NEWARTHILL

MAYBOLE

LONGANNET

KINTORE

KINCARDINE

KILMARNOCK SOUTH

KILLIN

KENDOON

KEITH

KAIMES

INVERARAY

HUNTERSTON

HADYARD HILL

GRANGEMOUTH

GLENLEE

WINDYHILL

EAST KILBRIDE SOUTH

WINDYHILL

WISHAW

FORT AUGUSTUS

FASNAKYLE

ERROCHTY

EASTERHOUSE

DEVOLMOOR

DEVOLMOOR

CURRIE

CHARLOTTE STREET

WHITELEE

KILMARNOCK SOUTH

COATBRIDGE

BLACKLAW

GLENFARCLAS

WHISTLEFIELD

DUNOON

TAYNUILT

FORT WILLIAM

BRAEHEAD PARK

BONNYBRIDGE

BLACKHILLOCK

BEAULY

TORNESS

LAMBHILL

HELENSBURGH

DOUNREAY

BLACKLAW

GOVAN

COYLTON

COCKENZIE

CLYDE'S MILL

BUSBY

PORT DUNDAS

WEST GEORGE STREET

PAISLEY

BROADFORD

GIFFNOCK

EAST KILBRIDE

DRUMCHAPEL

DALLAS

PORTOBELLO

WHITEHOUSE

SHRUBHILLDEWAR PLACESIGHTHILL

BRACO

GLENLUCE

STRATHLEVEN

STRATHAVEN

SMEATON

SLOY

SHIN

NEWTON STEWART

DALMARNOCK

GLENDOE

EDINBANE

MARK HILL

ARDMORE

ALNESS

BRORA DUNBEATH

MYBSTER

THURSO

FARRWIND FARM

ORRIN

LUICHART

MOSSFORD

GRUDIEBRIDGE

KILMORACK

AIGAS

CULLIGRAN

DEANIE

LAIRG

CASSLEY

BOAT OFGARTEN

NAIRN ELGIN

INVERKIP

HUNTERSTON

MOFFAT

FALLAGO

C9C7

C3

C2

C1

C4B1B2E1/E6F6

H1

E8 E7 B3 A8

H2

H6

L2

L5

G1

G6

B4

C5

J2

J3

J1

K1

K4

K6

J7

J4J6

L8

L3

M4

L5

N6

N2

M7

M6

M8

N3

M5

N8

N1

Q8

P1

P2

P3

P5

N7

N5

N4

R4

R5R6 Q7

Q5

Q6 Q4

Q2

P8

P7

K2

K5

L7

P6

S9

T1

T2

T4

T3

S6

S7

S2S4

S5

S1

A6A3

A1A7

A4

J8

J5D5

A9

C6

D4

D6

G5

G7

P4

S3

Figure ETYS Zones

A1.4: GB Existing Transmission System

T5

B5

B5

B2

B4

EC1

NW1

NW3NW4

NW4NW3

NW2

EC3

EC5

EC5

EC6

B13

B13SC1

SC1

B10

B10

B12

B12

NW2

B15

B15

B16

B16

B11

B11

B8

B8

B9

B6

B6

B7aB7

B7a

B7

B9B17

B17

B1

B1

B2

B3

B3

B4

B14/B14e

NW1

EC7

EC7

System Boundaries

B0B0Figure A1.5: GB Transmission System Boundaries

2

MEDWAY

1 2

1

2

FRASERBURGH

STRICHENST. FERGUS MOBIL

ST. FERGUS GASPETERHEAD GRANGE

MOSSMORRAN

MILTON OF CRAIGIE

GLENROTHES

WESTFIELD

FIDDES

DEVONSIDE

CRAIGIEBUCKLER

WESTFIELD

ABERNETHY

BRECHIN GRID

COUPAR ANGUS

BURGHMUIR

GLENNISTON

CHARLESTON

STIRLING

TARLAND

ARBROATH

LEVEN CUPAR

TEALING

RED HOUSE

PERSLEY

PETERHEAD

DUNLAWEXTENSION

AYR

INVERNESS

WHITELEE EXT

CLYDE NORTH

MEADOWHEADKILWINNING

KNOCKNAGAEL

FOYERS

AN SUIDHE

CLYDE SOUTH

CRUACHAN

DALMALLY

PORT ANN

HAGGS ROAD

ERSKINE

DUNVEGAN

CARRADALE

AUCHENCROSH

FERNOCH

GRETNA

ELVANFOOT

COALBURN

TONGLAND

HAWICK

GALASHIELS

DUMFRIES

ECCLES

CHAPELCROSS

INVERARNAN

CRYSTAL RIG

NEILSTON

NEWARTHILL

MAYBOLE

LONGANNET

KINTORE

KINCARDINE

KILMARNOCK SOUTH

KILLIN

KENDOON

KEITH

KAIMES

INVERARAY

HUNTERSTON

HADYARD HILL

GRANGEMOUTH

GLENLEE

WINDYHILL

EAST KILBRIDE SOUTH

WINDYHILL

WISHAW

FORT AUGUSTUS

FASNAKYLE

ERROCHTY

EASTERHOUSE

DEVOLMOOR

DEVOLMOOR

CURRIE

CHARLOTTE STREET

WHITELEE

KILMARNOCK SOUTH

COATBRIDGE

BLACKLAW

GLENFARCLAS

WHISTLEFIELD

DUNOON

TAYNUILT

FORT WILLIAM

BRAEHEAD PARK

BONNYBRIDGE

BLACKHILLOCK

BEAULY

TORNESS

LAMBHILL

HELENSBURGH

DOUNREAY

BLACKLAW

GOVAN

COYLTON

COCKENZIE

CLYDE'S MILL

BUSBY

PORT DUNDAS

WEST GEORGE STREET

PAISLEY

BROADFORD

GIFFNOCK

EAST KILBRIDE

DRUMCHAPEL

DALLAS

PORTOBELLO

WHITEHOUSE

SHRUBHILLDEWAR PLACESIGHTHILL

BRACO

GLENLUCE

STRATHLEVEN

STRATHAVEN

SMEATON

SLOY

SHIN

NEWTON STEWART

DALMARNOCK

GLENDOE

EDINBANE

MARK HILL

ARDMORE

ALNESS

BRORA DUNBEATH

MYBSTER

THURSO

FARRWIND FARM

ORRIN

LUICHART

MOSSFORD

GRUDIEBRIDGE

KILMORACK

AIGAS

CULLIGRAN

DEANIE

LAIRG

CASSLEY

BOAT OFGARTEN

NAIRN ELGIN

INVERKIP

HUNTERSTON

MOFFAT

FALLAGO

TOD POINT

BODELWYDDAN

CARRINGTON

1 2

GREYSTONES

LACKENBY

STANAH

CANTERBURYNORTH

2

CLEVEHILL

1

KEMSLEY

MOYLE

1

1

BANK

1 2

1 2

1

2

1 2

1 2

BRIDGWATER

1

2

1 2

CHICKERELL

1

2

2

1

DRAKELOW

1 2

1

11

2

22

STALYBRIDGE

1

2

2

1WASHWAYFARM

PENWORTHAM1

2

FFESTINIOG

SEABANK

1 2

1

1

22

CHESTERFIELD

STAYTHORPE

1 2

12HACKNEY

1 1WIMBLEDON

22LITTLEBROOK

HURST

NEW CROSS

RASSAU

1

1

2

2

WYLFA

PENTIR

DINORWIG

CARDIFFEAST

E de F

1

1 1 1 1212

2 2 2 2BOLNEY NINFIELD DUNGENESS SELLINDGE

(270kV DC)

INDIANQUEENS EXETER

AXMINSTERMANNINGTON NURSLING

FAWLEY

LOVEDEAN

OCKER

BISHOPSWOOD

1

1

RUGELEY

LEGACY

1

1

1

112

2

2

2 2

2

2

2

COVENTRY

HAMSHALL

1

IRONBRIDGE

PENN

BUSHBURY

HILL

WILLENHALL

CELLARHEAD

FECKENHAM BERKSWELL

NECHELLS

BUSTLEHOLM

OLDBURY

KITWELL

ON SOAR

RATCLIFFE

1

2

WILLINGTON EAST

1

2

TRAWSFYNYDD

DEESIDE

HUMBER

GRIMSBYWEST

1 2

NEEPSEND

FERRYBRIDGE

RAINHILL

1

1

1

1

1

1

1

1

1

1

22

2

2

2

2

22

2

2

2

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

3 4

ALDWARKE

THURCROFT

BRINSWORTH

DAINES

PADIHAM

BRADFORDWEST

KIRKSTALL

SKELTONGRANGE

ELLAND

ROCHDALE

WHITEGATE

KEARSLEY

STOCKSBRIDGE

POPPLETON

MONKFRYSTON

OFFERTONBOLDON

WEST

HUTTONHEYSHAM

KIRKBY

LISTERDRIVE

BIRKENHEAD

FIDDLERS

FERRY

FRODSHAM

CAPENHURST

TYNEMOUTH SOUTHSHIELDS

1

1

1

1

1

1

1

12

2

2

2

2

2

2

2

HIGH

PITSMOOR

JORDANTHORPENORTON LEES

WINCOBANK

TEMPLEBOROUGH

SHEFFIELDCITY

SOUTHMANCHESTER

MACCLESFIELD

BREDBURY

EGGBOROUGH

DRAX

KEADBY

WEST BURTON

COTTAM

MARNHAM

THORPEMARSH

WEST MELTON

BOTLEYWOOD

1

2

BARKING

1

2

21

1

11

1

1

1

2

2

2

2

2

2

2

2

2

1 1

1

1

1

BRAINTREE

2

2

22

2

EATONSOCON

NORWICHMAIN

BURWELLMAIN

PELHAM

RYE HOUSE

SUNDONWYMONDLEYMAIN

GRENDON

ENDERBY

1

2

2

HINKLEYPOINT

TREMORFA

TAUNTON

1

1

1

1

1 1

1

1

1 1 1 1

1

1

1

1

1

1

1

1

2

21

W E

34

1

12

2

IVER WATFORDSOUTH

LALEHAM

EALINGWILLESDEN

2

1

WEST

WEYBRIDGE

DIDCOT

1

2

COWLEY

WALHAM

CILFYNYDD CULHAM JET

MAINAMERSHAM

WHITSON

UPPERBOAT

IRON

IMPERIALPARK

ACTON

MINETY

MELKSHAM BRAMLEY

FLEET

TOTTENHAM

ST.JOHNSWOOD

ROAD

WALPOLE

BRAMFORD

PEMBROKE

COWBRIDGE

ABERTHAW

ALVERDISCOTT

1

1

1

2

2

2

2

2

1

BEDDINGTON

CHESSINGTON1

2

2

ROWDOWN

22

2

2 2 2 2

2

2

22

2

1

TILBURY

2

2

2

2

2

2

BARKINGREDBRIDGE

BRIMSDOWN

SIZEWELL

WALTHAMCROSS

WARLEYELSTREE

MILL HILL

SHREWSBURY

PATFORDBRIDGE

EASTCLAYDON

LEIGHTONBUZZARD

KILLINGHOLME

12

GRAIN

NORTHFLEET

RAYLEIGH MAIN

CORYTON

EAST

LANDULPH

ABHAM

1

2

THORNTON

21

SPALDINGNORTH

CITY

LANGAGE

1

1

MARCHWOOD

2

1

2 1

3

BRITNED

1

2

1

BICKERFENN

1 2

USKMOUTH

21

HARKER2

1

FOURSTONES BLYTH

21

KINGSNORTH

SINGLEWELL

1 2

WESTHAM

WEST THURROCK

1

2

HARTMOOR

HARTLEPOOL

HAWTHORNPIT

STOKEBARDOLPH

EIRGRID

OSBALDWICK

NORTON

SPENNYMOOR

1

2

STELLAWEST

BECK

SALTEND

CREYKE

HUMBER

NORTH

HEDON

SALTEND

REFINERYSOUTH

MARGAM

PYLE

SALTHOLME

BAYBAGLAN

1

SWANSEA NORTH

1

2

NA

TIO

NA

L G

RID

SH

E T

RA

NS

MIS

SIO

NS

P T

RA

NS

MIS

SIO

N

400kV Circuit275kV Circuit132kV Circuit

400kV Substation275kV Substation132kV Substation

Legend

Note: Not all radial 132kV circuits are indicated on this diagram

B12aB12b

B15a

B15a

SW1

SW1

2

MEDWAY

1 2

1

2

FRASERBURGH

STRICHENST. FERGUS MOBIL

ST. FERGUS GASPETERHEAD GRANGE

MOSSMORRAN

MILTON OF CRAIGIE

GLENROTHES

WESTFIELD

FIDDES

DEVONSIDE

CRAIGIEBUCKLER

WESTFIELD

ABERNETHY

BRECHIN GRID

COUPAR ANGUS

BURGHMUIR

GLENNISTON

CHARLESTON

STIRLING

TARLAND

ARBROATH

LEVEN CUPAR

TEALING

RED HOUSE

PERSLEY

PETERHEAD

DUNLAWEXTENSION

AYR

INVERNESS

WHITELEE EXT

CLYDE NORTH

MEADOWHEADKILWINNING

KNOCKNAGAEL

FOYERS

AN SUIDHE

CLYDE SOUTH

CRUACHAN

DALMALLY

PORT ANN

HAGGS ROAD

ERSKINE

DUNVEGAN

CARRADALE

AUCHENCROSH

FERNOCH

GRETNA

ELVANFOOT

COALBURN

TONGLAND

HAWICK

GALASHIELS

DUMFRIES

ECCLES

CHAPELCROSS

INVERARNAN

CRYSTAL RIG

NEILSTON

NEWARTHILL

MAYBOLE

LONGANNET

KINTORE

KINCARDINE

KILMARNOCK SOUTH

KILLIN

KENDOON

KEITH

KAIMES

INVERARAY

HUNTERSTON

HADYARD HILL

GRANGEMOUTH

GLENLEE

WINDYHILL

EAST KILBRIDE SOUTH

WINDYHILL

WISHAW

FORT AUGUSTUS

FASNAKYLE

ERROCHTY

EASTERHOUSE

DEVOLMOOR

DEVOLMOOR

CURRIE

CHARLOTTE STREET

WHITELEE

KILMARNOCK SOUTH

COATBRIDGE

BLACKLAW

GLENFARCLAS

WHISTLEFIELD

DUNOON

TAYNUILT

FORT WILLIAM

BRAEHEAD PARK

BONNYBRIDGE

BLACKHILLOCK

BEAULY

TORNESS

LAMBHILL

HELENSBURGH

DOUNREAY

BLACKLAW

GOVAN

COYLTON

COCKENZIE

CLYDE'S MILL

BUSBY

PORT DUNDAS

WEST GEORGE STREET

PAISLEY

BROADFORD

GIFFNOCK

EAST KILBRIDE

DRUMCHAPEL

DALLAS

PORTOBELLO

WHITEHOUSE

SHRUBHILLDEWAR PLACESIGHTHILL

BRACO

GLENLUCE

STRATHLEVEN

STRATHAVEN

SMEATON

SLOY

SHIN

NEWTON STEWART

DALMARNOCK

GLENDOE

EDINBANE

MARK HILL

ARDMORE

ALNESS

BRORA DUNBEATH

MYBSTER

THURSO

FARRWIND FARM

ORRIN

LUICHART

MOSSFORD

GRUDIEBRIDGE

KILMORACK

AIGAS

CULLIGRAN

DEANIE

LAIRG

CASSLEY

BOAT OFGARTEN

NAIRN ELGIN

INVERKIP

HUNTERSTON

MOFFAT

FALLAGO

TOD POINT

BODELWYDDAN

CARRINGTON

1 2

GREYSTONES

LACKENBY

STANAH

CANTERBURYNORTH

2

CLEVEHILL

1

KEMSLEY

MOYLE

1

1

BANK

1 2

1 2

1

2

1 2

1 2

BRIDGWATER

1

2

1 2

CHICKERELL

1

2

2

1

DRAKELOW

1 2

1

11

2

22

STALYBRIDGE

1

2

2

1WASHWAYFARM

PENWORTHAM1

2

FFESTINIOG

SEABANK

1 2

1

1

22

CHESTERFIELD

STAYTHORPE

1 2

12HACKNEY

1 1WIMBLEDON

22LITTLEBROOK

HURST

NEW CROSS

RASSAU

1

1

2

2

WYLFA

PENTIR

DINORWIG

CARDIFFEAST

E de F

1

1 1 1 1212

2 2 2 2BOLNEY NINFIELD DUNGENESS SELLINDGE

(270kV DC)

INDIANQUEENS EXETER

AXMINSTERMANNINGTON NURSLING

FAWLEY

LOVEDEAN

OCKER

BISHOPSWOOD

1

1

RUGELEY

LEGACY

1

1

1

112

2

2

2 2

2

2

2

COVENTRY

HAMSHALL

1

IRONBRIDGE

PENN

BUSHBURY

HILL

WILLENHALL

CELLARHEAD

FECKENHAM BERKSWELL

NECHELLS

BUSTLEHOLM

OLDBURY

KITWELL

ON SOAR

RATCLIFFE

1

2

WILLINGTON EAST

1

2

TRAWSFYNYDD

DEESIDE

HUMBER

GRIMSBYWEST

1 2

NEEPSEND

FERRYBRIDGE

RAINHILL

1

1

1

1

1

1

1

1

1

1

22

2

2

2

2

22

2

2

2

1

1

1

1

1

1

1

1

1

1

2

2

2

2

2

2

2

2

2

3 4

ALDWARKE

THURCROFT

BRINSWORTH

DAINES

PADIHAM

BRADFORDWEST

KIRKSTALL

SKELTONGRANGE

ELLAND

ROCHDALE

WHITEGATE

KEARSLEY

STOCKSBRIDGE

POPPLETON

MONKFRYSTON

OFFERTONBOLDON

WEST

HUTTONHEYSHAM

KIRKBY

LISTERDRIVE

BIRKENHEAD

FIDDLERS

FERRY

FRODSHAM

CAPENHURST

TYNEMOUTH SOUTHSHIELDS

1

1

1

1

1

1

1

12

2

2

2

2

2

2

2

HIGH

PITSMOOR

JORDANTHORPENORTON LEES

WINCOBANK

TEMPLEBOROUGH

SHEFFIELDCITY

SOUTHMANCHESTER

MACCLESFIELD

BREDBURY

EGGBOROUGH

DRAX

KEADBY

WEST BURTON

COTTAM

MARNHAM

THORPEMARSH

WEST MELTON

BOTLEYWOOD

1

2

BARKING

1

2

21

1

11

1

1

1

2

2

2

2

2

2

2

2

2

1 1

1

1

1

BRAINTREE

2

2

22

2

EATONSOCON

NORWICHMAIN

BURWELLMAIN

PELHAM

RYE HOUSE

SUNDONWYMONDLEYMAIN

GRENDON

ENDERBY

1

2

2

HINKLEYPOINT

TREMORFA

TAUNTON

1

1

1

1

1 1

1

1

1 1 1 1

1

1

1

1

1

1

1

1

2

21

W E

34

1

12

2

IVER WATFORDSOUTH

LALEHAM

EALINGWILLESDEN

2

1

WEST

WEYBRIDGE

DIDCOT

1

2

COWLEY

WALHAM

CILFYNYDD CULHAM JET

MAINAMERSHAM

WHITSON

UPPERBOAT

IRON

IMPERIALPARK

ACTON

MINETY

MELKSHAM BRAMLEY

FLEET

TOTTENHAM

ST.JOHNSWOOD

ROAD

WALPOLE

BRAMFORD

PEMBROKE

COWBRIDGE

ABERTHAW

ALVERDISCOTT

1

1

1

2

2

2

2

2

1

BEDDINGTON

CHESSINGTON1

2

2

ROWDOWN

22

2

2 2 2 2

2

2

22

2

1

TILBURY

2

2

2

2

2

2

BARKINGREDBRIDGE

BRIMSDOWN

SIZEWELL

WALTHAMCROSS

WARLEYELSTREE

MILL HILL

SHREWSBURY

PATFORDBRIDGE

EASTCLAYDON

LEIGHTONBUZZARD

KILLINGHOLME

12

GRAIN

NORTHFLEET

RAYLEIGH MAIN

CORYTON

EAST

LANDULPH

ABHAM

1

2

THORNTON

21

SPALDINGNORTH

CITY

LANGAGE

1

1

MARCHWOOD

2

1

2 1

3

BRITNED

1

2

1

BICKERFENN

1 2

USKMOUTH

21

HARKER2

1

FOURSTONES BLYTH

21

KINGSNORTH

SINGLEWELL

1 2

WESTHAM

WEST THURROCK

1

2

HARTMOOR

HARTLEPOOL

HAWTHORNPIT

STOKEBARDOLPH

EIRGRID

OSBALDWICK

NORTON

SPENNYMOOR

1

2

STELLAWEST

BECK

SALTEND

CREYKE

HUMBER

NORTH

HEDON

SALTEND

REFINERYSOUTH

MARGAM

PYLE

SALTHOLME

BAYBAGLAN

1

SWANSEA NORTH

1

2

NA

TIO

NA

L G

RID

SH

E T

RA

NS

MIS

SIO

NS

P T

RA

NS

MIS

SIO

N

400kV Circuit275kV Circuit132kV Circuit

400kV Substation275kV Substation132kV Substation

Legend

Note: Not all radial 132kV circuits are indicated on this diagram

400kV Circuit275kV Circuit132kV Circuit

400kV Substation275kV Substation132kV Substation

Legend

ReactorMSCSVC

2 x 45MVAr

1 x 50MVAr3 x 20MVAr

2 x -75/+150MVAr

2 x -30MVAr1 x 72.5MVAr1 x 0/+60MVAr

1 x -60MVAr1 x 225MVAr

6 x 60MVAr2 x -75/+150MVAr

2 x 45MVAr1 x 0/+60MVAr

2 x -60MVAr1 x -200MVAr1 x 225MVAr

1 x -74/+150MVAr2 x -60MVAr

1 x 225MVAr3 x 60MVAr

2 x -60MVAr

4 x 60MVAr1 x 225MVAr

1 x -150/+150MVAr

2 x -100MVAr2 x -60MVAr3 x -30MVAr2 x 150MVAr 1 x -200MVAr

2 x -150/+150MVAr

1 x -200MVAr

2 x -60MVAr3 x -100MVAr

1 x +150MVAr

2 x -100MVAr

2 x -100MVAr

1 x -60MVAr1 x -200MVAr

3 x 60MVAr2 x -100/150MVAr

1 x -200MVAr2 x +60MVAr

1 x 225MVAr 2 x -60MVAr

2 x -60MVAr1 x -200MVAr

3 x 60MVAr

2 x 60MVAr

1 x 60MVAr

2 x 0/+60MVAr

1 x 45MVAr

3 x 60MVAr

2 x -60MVAr1 x -200MVAr

2 x -60MVAr

2 x -60MVAr3 x 60MVAr

1 x 45MVAr2 x 0/+60MVAr

1 x -200MVAr3 x 60MVAr

2 x -100MVAr

2 x -60MVAr

1 x -200MVAr2 x -60MVAr

2 x 0/+60MVAr

3 x -100MVAr

3 x 60MVAr

1 x 225MVAr

1 x -60MVAr

3 x 60MVAr

3 x 60MVAr

2 x -60MVAr2 x -75/+150MVAr

2 x -60MVAr2 x 225MVAr

2 x -60MVAr2 x 60MVAr

1 x 225MVAr1 x -50/+225MVAr

3 x 60MVAr1 x 150MVAr

1 x -60MVAr1 x -75/+150MVAr

2 x -60MVAr1 x 20MVAr

1 x -60MVAr1 x 0/+60MVAr

1 x 150MVAr

1 x 0/+60MVAr

3 x 60MVAr

3 x 60MVAr1 x 225MVAr

1 x -100MVAr

2 x -60MVAr

2 x 225MVAr4 x 60MVAr

2 x -75/150MVAr

2 x 225MVAr1 x -75/+150MVAr

1 x 0/+60MVAr

1 x 225MVAr1 x -75/+150MVAr

2 x -60MVAr

1 x -60MVAr1 x 150MVAr

1 x -60MVAr3 x 60MVAr

1 x -60MVAr

1 x 60MVAr

1 x -60MVAr

1 x 150MVAr

1 x -100MVAr

4 x 45MVAr 4 x 45MVAr

1 x -60MVAr

2 x -60MVAr1 x 60MVAr

2 x -60MVAr1 x 150MVAr

2 x -75/+150MVAr

1 x -60MVAr

2 x -60MVAr

1 x 150MVAr

1 x -100MVAr

3 x 60MVAr1 x 150MVAr

3 x 20MVAr

1 x -60MVAr

3 x 20MVAr

1 x 60MVAr

1 x -200MVAr

2 x -60MVAr3 x 60MVAr

1 x 225MVAr

1 x -60MVAr

3 x 60MVAr2 x 225MVAr

1 x -60MVAr

1 x -60MVAr1 x -60 to -30MVAr

-200MVAr

2 x -60MVAr

1 x -60MVAr3 x 60MVAr1 x 0/+60MVAr

2 x 225MVAr

2 x -60MVAr

3 x 60MVAr

1 x -60MVAr

2 x -60 to -30MVAr

1 x -200MVAr

3 x 45MVAr

2 x -60MVAr

2 x -60MVAr

2 x 45MVAr1 x -75/225MVAr

1 x -60MVAr

1 x -57MVAr

2 x -60MVAr

1 x -60MVAr

2 x -60MVAr

2 x -150MVAr

2 x -60MVAr

1 x -60MVAr

1 x -60MVAr

2 x -30MVAr

1 x 150MVAr

1 x 225MVAr

1 x -150/150MVAr

2 x -30MVAr

2 x -90MVAr

2 x -60MVAr

Figure A1.6: GB Reactive Compensation Plant