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
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