Appendix A1 System Schematics

Electricity Ten Year Statement 2015 Electricity Ten Year Statement 2015 1 Appendix Contents

Appendix A includes a set of system schematics and geographic drawings of the current NETS, with the A approximate locations of existing power stations and reactive compensation plants shown. The schematics also show the NETS boundaries and ETYS zones we have used in our analysis. System schematics and geographic drawings Appendix A Geographical A1 – GB Existing Power Stations...... 2 A2 – GB Existing Transmission System...... 3 A3 – GB Transmission System Boundaries...... 4

Schematic A4 – GB Existing Transmission System...... 5 A5 – GB Transmission System ETYS Zones...... 6 A6 – GB Transmission System Boundaries...... 7 A7 – GB Reactive Compensation Plant...... 8 A ppendi x A x A ppendi A 2

Figure A1: GB Existing Power Stations

PLANT TYPE

Baillie & Bernaheig NUCLEAR Camster Causeymire Burn of Whilk COAL

Buolfruich Cassley OIL & OCGT Gordonbush Moray Firth

Rosehall Lairg Kilbraur CCGT/CHP Lairg-Achany

Shin HYDRO/PUMPED

Beinn Tharsiun STORAGE

Grudie Bridge Mossford Novar WIND Conon Luichart Orrin Lochluichart Boyndie Fairburn Deanie Cairn Uish OTHER Ben Aketil Culligran Edinbane Aigas Glens of Foundland Peterhead Kilmorack Hills of Towie Berry Burn Dummuies SUBSTATIONS Fasnakyle Torr Achil Stoneywood Paul's Hill Millennium Glen Livishie Morrison Foyers Caennacroc Farr Glendoe

Invergarry Quoich

Kinlochleven Errochty Power Station Tullo Rannoch Clunie Drumderg Firth of Forth Tummel Bridge Argyll Array Cashlie Pitlochry Lochay

Finlarig Inverawe Cruachan St. Fillans Clachan Nant Ardkinglas Griffin Sloy Braes of Doune An Suidhe Denny Markinch Exxon Mossmorran Earlsburn Longannet

Cruach Mho Grangemouth Torness Islay Fallago Aikengall Tormywheel Dun Law Crystal Rig Hunterston Wst Browncastle 1 & 2 Extension Toddleburn Gigha Blacklaw Sneddon Law Whitelee Bowbeat Long Park Deucheran Whitelee Ext. Beinn an Tuirc Caledonian Paper Mill Bankend Rig Dogger Bank Tangy Farm Clyde North

Clyde South Hadyard Hill

Harestanes Lynemouth Steven’s Croft Moyle Mark Hill Minsca Far To Northern Ireland Dalswinton Ewe Hill Arecleoch

Carscreugh Tongland

Hartlepool

Teesside

Robin Rigg Wilton Sellafield

Ormonde Hornsea Roosecote Heysham Walney I & II

West of Duddon Barrow Westermost Rough

Drax Humber Gateway Ferrybridge Saltend East - West To Ireland Eggborough Killingholme Keadby Immingham Burbo Bank Brigg South Humber Bank Wylfa Gwynt y Mor North Hoyle Rhyl Flats Fiddlers West Burton Shotton Paper Ferry Cottam CDCL Connahs Quay Inner Dowsing Rocksavage Lincs Deeside Dinorwig Lynn Sheringham Shoal East Anglia Staythorpe Ffestiniog Derwent

Spalding Sutton Bridge Rugeley Ratcliffe-on-Soar Kings Lynn Scroby sands

Corby Great Yarmouth Peterborough

Sizewell B

Little Barford

Greater Gabbard 500MW

Rye House Pembroke Brimsdown Gunfleet Sands I&II BitNed To Netherlands London Array Baglan Bay Severn Power Taylors Lane Coryton Didcot Barking Uskmouth Medway Seabank Littlebrook Thanet Grain Damhead Creek Barry Aberthaw Kingsnorth

Hinkley Point B

Marchwood Dungeness

Shoreham IFA Fawley To France Cowes

Langage Rampion

Indian Queens Narvitu Bay 3 Figure A2: GB Existing Transmission System

400kV Substations 275 kV Substations 132kV Substations

400kV Circuits 275kV Circuits 220kV Circuits 132kV Circuits

Interconnectors

Dounreay Thurso

Mybster Major Generating Sites Including Pumped Storage

Cassley Moray Firth Stornoway Dunbeath Connected at 400kV Connected at 275 kV Lairg Hydro Generation Harris Brora Shin

Grudie Bridge Mossford Alness Corriemoillie Fraserburgh Luichart Orrin Elgin Macduff St. Fergus Ardmore Deanie Keith Culligran Dingwall Strichen Nairn Blackhillock Aigas Kilmorack Inverness Dunvegan Peterhead Beauly Knocknagael Fasnakyle Dyce Kintore Persley Glen Broadford Morrison Woodhill Willowdale Caennacroc Foyers Clayhills Fort Augustus Boat of Quoich Garten Tarland Glendoe Craigiebuckler Redmoss Invergarry

Kinlochleven Tummel Fiddes

Fort William Errochty Power Station Errochty Rannoch Clunie Firth of Forth Tummel Bridge Tealing Dudhope Arbroath Lochay Cashlie Lyndhurst Milton of Craigie Taynuilt Killin Charleston Dalmally Finlarig Dudhope Cruachan Burghmuir Glenagnes St. Fillans Nant Clachan Inverarnan SCOTTISH HYDRO-ELECTRIC Cupar Inveraray Sloy TRANSMISSION Glenrothes Leven Devonside Westfield Redhouse Whistlefield Kincardine Stirling Dunfemline Glenniston Helensburgh Denny Mossmorran Port Ann Longannet Inverkeithing Grangemouth Dunbar Dunoon Spango Bonnybridge Telford Rd.ShrubhillCockenzie BroxburnGorgie Portobelllo Valley Strathleven Windyhill Bathgate Crystal Rig Torness Erskine Lambhill Whitehouse Devol Easterhouse Fallago Coatbridge Livingston Smeaton Moor Newarthill CurrieKaimes Crossaig Neilston Clydes Mill Dunlaw Extension Berwick Hunterston Strathaven Black Law Marshall Meadows Busby Kilwinning WhiteleeEast Wishaw Kilmarnock Kilbride Saltcoats Whitelee Extn Coalburn Town South Eccles Meadowhead SP TRANSMISSION LTD Carradale Galashiels Kilmarnock Coalburn South Ayr Clyde (North) Dogger Bank Coylton Clyde (South) Elvanfoot Hawick Harestanes Maybole New Cumnock Moffat

Kendoon Carsfad Markhill To Northern Ireland Glenlee Gretna Blyth Arecleoch Earlstoun Dumfries Ecclefechan Auchencrosh Fourstones Newton Stewart Tynemouth Chapelcross Harker South Shields Stella West Tongland West Boldon Glenluce Offerton Hawthorne Pit Hartmoor Spennymoor Hartlepool SaltholmeTod Point Teesside Wigtown Bay Norton Robin Rigg Greystones Grangetown Lackenby

Hutton Hornsea Ormonde

Walney I & II Quernmore Heysham Osbaldwick Knaresborough West of Duddon Middleton Barrow Bradford Thornton West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk Fryston Saltend Shell Flats North Hedon Penwortham Drax Humber Gateway Elland Saltend South Eggborough Rochdale Ferrybridge To Ireland Washway Keadby Humber Refinery Burbo Bank Farm Kearsley Templeborough Thorpe Whitegate Killingholme Triton Knoll Kirkby West Marsh South Stalybridge Melton Humber Grimsby West Gwynt y Mor Carrington Pitsmoor West Wylfa Rainhill Stocksbridge Aldwarke Bank Winco Bank Burton Bredbury Neepsend Thurcroft Rhyl Flats Fiddlers North Hoyle Rocksavage Daines Sheffield City Ferry Cottam Race Bank Jordanthorpe Brinsworth Inner Dowsing Dudgeon Capenhurst Frodsham Bodelwyddan Norton Lees Pentir Macclesfield Chesterfield Lincs Deeside High Dinorwig South Manchester Connah’s Quay Marnham Sheringham Shoal Lynn Norfolk Staythorpe Docking Shoal Legacy Ffestiniog Cellarhead Stoke Bardolph Bicker Fen Ratcliffe Willington on Soar Trawsfynydd

Drakelow Walpole Rugeley Spalding North Ironbridge Sutton Norwich Main Bushbury Bridge Scroby sands Willenhall Bustleholm Shrewsbury Penn Enderby Nechells Hams Hall Ocker Hill Coventry Oldbury Kitwell Berkswell

Burwell Main Sizewell Feckenham Grendon Bishops Wood Eaton Socon

Patford Bramford Bridge Greater Gabbard 500MW Sundon East Claydon Pelham Braintree Wymondley Leighton Buzzard Greater Gabbard 2nd part Rassau Walham Waltham Rye House Cross Imperial Brimsdown Park Gunfleet Sands I&II Cowley Swansea North Watford Elstree Hackney To Netherlands Pembroke Amersham Main London Array Cilfynydd Culham Tottenham Redbridge Rayleigh Main Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Margam Iron Acton Willesden Barking Coryton Alpha Steel Whitson Iver Ealing Pyle West Ham City Rd West ThurrockTilbury Grain Hurst Seabank St Johns Kentish Flats Laleham New Northfleet Kingsnorth Thanet Tremorfa Wood Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham ChessingtonCross East East Bramley West Weybridge Rowdown Littlebrook Beddington Fleet Canterbury Wimbledon North Hinkley Point Sellindge Bridgwater Alverdiscott Bolney Taunton Nursling Dungeness Mannington Marchwood Lovedean Ninfield Axminster Fawley Botley Wood Exeter To France

Chickerell Hastings

Langage Abham

Indian Queens Landulph

Isle of Wight 4 Figure A3: GB Transmission System Boundaries

B0 400kV Substations 275 kV Substations B0 132kV Substations

400kV Circuits 275kV Circuits 220kV Circuits 132kV Circuits

Interconnectors

System Boundaries Dounreay Thurso

Mybster Major Generating Sites Including Pumped Storage

Cassley Moray Firth B1 Stornoway Dunbeath Connected at 400kV Connected at 275 kV Lairg Hydro Generation Harris Brora Shin

Kinlochleven Tummel Fiddes

Fort William Errochty Power Station Errochty B2 Rannoch Clunie Firth of Forth Tummel Bridge Tealing Dudhope Arbroath B4 Lochay Cashlie Lyndhurst Milton of Craigie Taynuilt Killin Charleston Dalmally Finlarig Dudhope Cruachan Burghmuir Glenagnes St. Fillans B5 Nant Clachan Inverarnan B1 SCOTTISH HYDRO-ELECTRIC Cupar Inveraray Sloy TRANSMISSION Glenrothes Leven Devonside Westfield Redhouse Whistlefield Kincardine Stirling Dunfemline Glenniston Helensburgh Denny Mossmorran Port Ann Longannet Inverkeithing Bonnybridge Grangemouth Cockenzie Dunbar Dunoon Spango Telford Rd.Shrubhill Broxburn Gorgie Portobelllo Valley Strathleven Windyhill Bathgate Crystal Rig Torness Whitehouse B6 B2 Erskine Lambhill Devol Easterhouse Fallago Smeaton Moor Coatbridge Livingston Newarthill Currie Kaimes Crossaig Clydes Mill Neilston Berwick Hunterston Strathaven Black Law Dunlaw Extension Marshall Meadows Busby East Kilwinning Whitelee Wishaw B3b Kilmarnock Kilbride Saltcoats Town Whitelee ExtnSouth Coalburn Eccles Meadowhead SP TRANSMISSION LTD Carradale Galashiels Kilmarnock Coalburn South Ayr Clyde (North) Dogger Bank Coylton Clyde (South) Elvanfoot Hawick Harestanes B3b Maybole New Cumnock Moffat Kendoon Carsfad Markhill To Northern Ireland Glenlee Gretna Blyth Arecleoch Earlstoun Dumfries Ecclefechan B4 Auchencrosh Fourstones Newton Stewart Tynemouth Chapelcross Harker South Shields Stella West Tongland West Boldon Glenluce B5 Offerton Hawthorne Pit Hartmoor Spennymoor Hartlepool Saltholme Tod Point Wigtown Bay Teesside Norton B7 Robin Rigg Greystones Grangetown B6 Lackenby B7 B7a

Hutton B11 Hornsea Ormonde

Walney I & II Quernmore Heysham Osbaldwick B16 Knaresborough West of Duddon Middleton Barrow Bradford Thornton West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk Fryston Saltend Shell Flats North Hedon Penwortham Drax Humber Gateway Elland Saltend South Eggborough B7a Rochdale Ferrybridge B11 To Ireland To Ireland Washway Keadby Humber Refinery B8 B16 Burbo Bank Farm Kearsley Templeborough Thorpe EC1 Whitegate Killingholme Triton Knoll Kirkby West Marsh South Stalybridge Melton Humber Grimsby West Gwynt y Mor Carrington Pitsmoor West Wylfa Rainhill Stocksbridge Aldwarke Bank Winco Bank Burton B9 Bredbury Neepsend Thurcroft Rhyl Flats Fiddlers North Hoyle Rocksavage Daines Sheffield City Ferry Cottam Race Bank Jordanthorpe Brinsworth Inner Dowsing Dudgeon Capenhurst Frodsham Bodelwyddan Macclesfield Norton Lees EC5 Pentir Chesterfield Lincs Deeside High Dinorwig South Manchester Connah’s Quay Marnham Sheringham Shoal Lynn Norfolk Staythorpe Docking Shoal Legacy EC3 Ffestiniog Cellarhead Stoke Bardolph Bicker Fen Ratcliffe NW1 Willington on Soar Trawsfynydd B17

Drakelow Walpole Rugeley Spalding North Ironbridge Sutton Norwich Main Bushbury Bridge Scroby sands NW2 Willenhall Bustleholm Shrewsbury Penn Enderby Nechells Hams Hall Ocker Hill Coventry Oldbury NW3 Kitwell Berkswell

Burwell Main Sizewell NW4 Feckenham Grendon Bishops Wood Eaton B8 Socon B9 Patford Bramford Bridge Greater Gabbard 500MW Sundon East Claydon Pelham Braintree B12 Wymondley Leighton B15 Buzzard Greater Gabbard 2nd part Rassau Walham Waltham Rye House Cross Imperial Brimsdown Park B14 Gunfleet Sands I&II Cowley Swansea North Watford Elstree Hackney To Netherlands Pembroke Amersham Main London Array Cilfynydd Culham Tottenham Redbridge Rayleigh Main SW1 Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Margam Iron Acton Willesden Barking Coryton Alpha Steel Whitson Iver Ealing Pyle West Ham City Rd West Thurrock Tilbury Grain Hurst Seabank St Johns Kentish Flats Wood New Northfleet Thanet Tremorfa Laleham Kingsnorth East Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham Chessington Cross East SW1 Bramley West Weybridge Rowdown Littlebrook SC1 Beddington Fleet Canterbury EC5 Wimbledon North B10 Hinkley Point Sellindge Bridgwater B13 Alverdiscott Bolney Taunton Nursling Dungeness Mannington Marchwood Lovedean Ninfield Axminster SC1 Fawley Botley Wood B15 Exeter To France Chickerell Hastings B10 B12

Langage Abham

Indian Queens Landulph

Isle of Wight

B13 NATIONAL GRID SP TRANSMISSION SHE TRANSMISSION FE A TAY PORT N R FOR

SU D N I ED DINOR B N N CROSSAIG U A O R MOYLE U VER I N U HARRIS D C S O T

I I A N C V L C

H T H A W N B T H EGA R AR E D AR N E AN I H WIG A F L N TRA O U TH LI R C A E N N R AD AM R Y T L KILMORACK MA D CULLIGRAN A O E E K WSFYNYDD A YR S R N VE ILW R L KI PENTIR H S DEANIE E E K T AIGAS W LMAR N AL O PEMBROKE I H 1 N T SHREWSBUR 2 N VERDISCOTT ILL O BA N BAGLAN SW N I INDIAN QUEENS N GLEN Y

N IRONBRIDGE S ME 1 G OC ANSEA T BISHOPS E AD W 2 K T WOOD MARGAM BODEL FFESTINIOG LU A FA OW WYLF BIRKENHEAD KIRKBY R W OWN PYLE C NOR T SN H DRIVE LISTER Y E MOSSFORD C HEAD LUICHAR D I GLEN GLEN STLEFI WYDDAN 2 OYL A 1 U SLO A D LANDULPH KYLE BRIDGE GRUDIE N TH ORRIN EV O T 1 Y O OLMOOR D K 3 KI 1 2 LEE ON D 1 2 H N EN OE 2 E T L EV AD FOR LD M MA W ABER 1 D AR OLMOOR O I Y 1 N 1 T 2 1 1 LANGAGE 1 YB O C AR 2 2 T ON D

N I 2 1

R N

Y KI THA O OC AU D

U VER H G LE 2 2 LLIN

A 1 2 2 H I LA GU BUSHBUR L H K CAPENHURST PENN CARDIFF EIRGRID C D EAST CASSLEY T ILL W L E BEA

AUNT S AR H ALMA UPPER BOA N ABHAM DEESIDE 2 1 L LAIRG ST 2 OU AN E D 1

1 N N 1 2 U

U AN TH S T L 2 1 S 2 ON 1 LL B Y 2 EXETER USKMOUTH D F W 1 U 1 LEGACY W Y ARM Y 1 U R ASHW N CILFYNYDD FRODSHAM KITWELL M G I EI N TREMORF 2 H F 2 D LST 2 2 3 2 R 1 2 1 2 C Y WHITSON W I E H H A ES AST ON 1 H A Y I AXMINSTER L H PE I 2 1 1 1 D 2 BR K L T 4 ER 1 AGGS GI RAINHILL R N 2 E

1 L KI U O L A ST F C WIND F F S A ROCKSA FIDDLERS FERR E M OCKER HILL EH C LBR ARR FN R KI GOV E ANAH C K HINKLEY QUA CONNAH’S POINT O 2 WILLENHALL 2 N

FO N H RASSAU EAD OC E 2 1 R RUGELEY CARRINGT S C E AG A I SH P OLDBUR X OA S CHICKERELL D Y H HEYSHAM CELLARHEAD YER P AI A ARM T Y K E S BU BRACO AR E 1 N I A

SL N D P L V E BRIDGW MIDDLET A S AGE ER LOTTE OU L TUMMEL S 2 INVERNESS 1 E 2 ALNESS 1 BRORA R BY 2 NAIRN C Y GAR BOA E K ACT IRON R TH W LAMB O D Y L OC 2 P IMPERIAL ON EA A ALLAS VA MOFF BUSTLEHOLM ES FECKENHAM 2 ARK W 1 T TEN L ON MANNINGT OF H STR B 2 ST H SEABANK N T 1 A TY ON U H PORT

I TER 1 FOOT G 2 2 1 TELEE 1 1

KEARSLEY W R ILL DAINES K A EO ELGIN MARCHWOOD PENWOR EET N GLEN ILBR 1 ALHAM T 2 STR D R DRAKELOW A

2 D G L DENNY I M U E A D 2 1 FAR ON

A N TH E S 1 NECHELLS 1 R D T MACCLESFIELD THAM DUNBEA N ROCHDALE A R AS C 1 2 O GR V C E MANCHESTER SOUTH F NURSLING L KE C E ET LYD A MELKSHAM P 2 MYBSTER A K 2 MINETY N WLEY 2 ADIHAM ETN S 1 B ITH WHITEGA LAC LON E' TH Harestanes A S 1 2 1 1 2 1 K HUTT MIL GAN WILLINGT 2 H ST C I HARKER C L 2 L L THURSO LOC L 1 AL N TE Y ON Y ET D D YBRIDGE 2 1 2 E E D K

BERKSWELL N N O ON EAST SOU W ELLAND E HALL HAMS OR EWAR U K BRAMLEY I AS 1 1 BOTLEY 2 WOOD SH C CULHAM JET FLEET IN N COWLEY BLAC LOVEDEAN TH DIDCOT OA TH R BRADFORD WEST T T A H EA ER COVENTR OR W KI A TBR 1 2 BREDBUR TH B W 2 1 H Y K N E 2 1 L O L C I I LL AC C A I U C AR D K W S U GE FOURST MAIN AMERSHAM K E FETTERESSO R D BON L NEEPSEND Y I R A WEYBRIDGE WEST N SHEFFIELD CITY Y W I E E LALEHAM N YB ONES 2 1 S R IGH FERR 2 I 2 C KIRKST D GALA 1 KAI 1 1 O GE TH U CHESSINGT YBRIDGE 1 G ME P ST GRANGE SKEL I SPENNYMOOR TA NOR LL CLA EAST 2 SH R AR 2 WINCOBANK W 2 IVER A OCKSBRIDGE ALL S PITSMOOR R N E D IE BUZZARD LEIGHT

1 2 3

YDON LAN G STFIE TEALI T A T EWAR EALING 1 L BRIDGE P E 1 2 ON ON LEES N 1 S A M W GU TFORD 2 D O BOLNEY H U N L 1 EXTENSION DUNLA S 2 I ON ON

2 PERSLEY T SOUTH W D TE PLA G FR H ENDERBY 1 KNARESBOROUGH STI A MONK 1 2 2 1 H TFORD YST WIMBLEDON C OUSE BU 2 WILLESDEN TEMPLEBOROUGH 1 R 1 E ELSTREE W LIN JORDANTHORPE 2 ON R F G G ALLAGO G SMEA 1 2 2 L H 2 1 2 E STELLA 1 WEST MU MILL ALDW SH N BRINSWOR C C 1 RIG 3 2 FI 1 BR 1 1 1 2 1 R 1 RYS R 2 PORT D R I O T 2 WEST R A NEW CROSS BEDDINGT C E HILL D U ON T P I C W H GI 1 ARKE H BH ES 2 2 T ETER 2 2 POPPLET OSBALDWICK D SUNDON 1 H A E WOOD ST AL E E EV 1 I R S O I M STFIE 1 B N MEL L 2 . JOHN’S ON SOAR RA LES 1 B BL O 1 L U

NINFIELD ON BRIMSDOWN

ELLO C GR TH H S C YTH TCLIFFE 1 AB S O 2 EAD K 2 T T S M C ON L I L ON ON Figure 2 E D W I CROSS E O D D ER ON KE R C 1 2 R R AL E YE HOUSE MOBIL ST C T R N 2 N THURCROFT 1 2 OR A 1 THAM 2 L THORNT GRENDON ETH . FERGUS ZI 2 1 E N 1 2 2 1 S E GRANGE PETERHEAD CHESTERFIELD EGGBOROUGH HURST N T ROAD CITY Y ES W 1 OTTENHAM TYNEMOUTH 1 2 S LEVE ST 2 2 1 1 1 ON 2 4 . FERGUSGAS AR STRICHEN 1 3 2 2 GLEN BARDOLPH ST 2 N WYMONDLEY MAIN 2 B ROWDOWN 1 OKE 1 MI R NOR DUNGENESS E 2 1 DRAX O HACKNEY L 3 N 1 1 2 1 FRASERBURGH A T 1 I 2 WEST ST HAM 2 ON T T A4: GBExistingT H THORPE REDBRIDGE ON MARSH 2 2 1 ON OFC ST SHIELDS SOUTH MARNHAM SOCON EA A C R HIGH YTHORPE 1 2 U 2 T ED R LITTLEBROOK ON P 1 2 A AR 2 1

W H IGI BARKING PELHAM LACKENBY 1 OU 1 2 ARLEY BRAINTREE GREYST E 1 BARKING SE BOLDON WEST KEADBY 2 WEST 1 2 2 1 BECK CREYKE ONES

T THURROCK 3 (270kV DC) OD POINT SELLINDGE BUR MAIN TILBUR BRAMFORD 1 E deF 1 1 1 1 2 1 WELL 2 2 2 EAST NOR 2 2 Y OFFER SINGLEWELL 1 COTT KILLINGHOLME 2 THFLEET 1 T ON AM NOR SAL 2 SAL WEST NOR SP KINGSNOR TEND KEMSLEY TH REFINER HUMBER ALDING THOLME TH BUR CANTERBUR NOR 2 1 2 RA T 2 HAR Y TH TH ON YLEIGH MAIN 1 NOR W MAIN TLEPOOL ALPOLE 1 SAL ransmission System HEDON BICKER FEN MEDW GRAIN WICH Y TEND 2 COR BRIDGE SUTT BANK HUMBER SOUTH 1 A SIZEWELL YT Y BRITNED HA PIT HAR ON CLEVE HILL GRIMSBY ON WEST WTHORN indicated onthisdiagram Note: Notallradial132kVcircuitsare Legend TMOOR 132kV Substation 275kV Substation 400kV Substation 132kV Circuit 220kV Circuit 275kV Circuit 400kV Circuit 5 NATIONAL GRID SP TRANSMISSION SHE TRANSMISSION S9 M7 FE M6 A N3 TAY M8 PORT N T3 R FOR

SU D N I ED S2 DINOR B N N CROSSAIG U A O R MOYLE U VER I N U HARRIS D C S O T

I I A N H6 C V L C

H T H A W L2 N B T H EGA H1 L5 R AR E D AR N E AN I H WIG A F L N TRA O U TH LI R C A E N N R AD AM R F6 Y T L KILMORACK MA D CULLIGRAN A O E E K WSFYNYDD N1 A YR S R N VE ILW R L KI PENTIR H S DEANIE E E K T AIGAS W LMAR N AL O PEMBROKE I H 1 N T SHREWSBUR 2 N VERDISCOTT ILL O BA N BAGLAN SW N I INDIAN QUEENS N GLEN Y

N IRONBRIDGE S ME 1 G OC ANSEA T BISHOPS E AD W 2 K T WOOD MARGAM BODEL FFESTINIOG LU A T1 FA OW WYLF BIRKENHEAD KIRKBY R W OWN PYLE C NOR T SN H DRIVE LISTER Y E MOSSFORD C HEAD LUICHAR D I GLEN GLEN STLEFI WYDDAN 2 OYL A 1 U SLO A D LANDULPH KYLE BRIDGE GRUDIE N TH ORRIN EV O T 1 Y O OLMOOR D K 3 KI 1 2 LEE ON S7 D 1 2 H N EN OE 2 E T L EV AD FOR LD M MA W ABER 1 D AR OLMOOR O I Y 1 N 1 T 2 1 1 LANGAGE 1 YB O C AR 2 2 T ON D

N I 2 1

R N

Y KI THA O OC AU D

U VER H G LE 2 2 LLIN

A 1 2 2 H I LA GU BUSHBUR L H K CAPENHURST PENN CARDIFF EIRGRID C D EAST CASSLEY T ILL W L E BEA

AUNT S AR H ALMA UPPER BOA N ABHAM DEESIDE 2 1 L LAIRG ST 2 OU AN E D 1 S6

1 N N 1 2 U

U AN TH S T L 2 1 S 2 ON 1 LL B M5 Y 2 M4 EXETER USKMOUTH D F W 1 U 1 LEGACY W Y ARM Y 1 U R ASHW N CILFYNYDD FRODSHAM H2 KITWELL M G I EI N E8 TREMORF 2 H F 2 D LST 2 2 3 2 R 1 2 1 2 C Y WHITSON W I E H H A ES AST ON 1 H A Y I AXMINSTER L H PE I 2 1 1 1 D 2 BR K L T 4 ER 1 AGGS GI RAINHILL R N 2 E

1 L KI U R5 O L A ST F C WIND F F S A ROCKSA FIDDLERS FERR E M OCKER HILL EH C LBR ARR FN R KI GOV E ANAH C K HINKLEY QUA CONNAH’S POINT O 2 WILLENHALL 2 N

FO N H RASSAU EAD OC E 2 1 R RUGELEY CARRINGT S C E AG A I SH P OLDBUR X OA S CHICKERELL D Y H HEYSHAM CELLARHEAD YER P AI A ARM T Y K E S BU BRACO AR E 1 N E1/E6 I A

SL N D P L V E BRIDGW MIDDLET A N8 S AGE E7 ER LOTTE OU L S4 TUMMEL S 2 INVERNESS 1 E 2 ALNESS 1 BRORA R BY 2 NAIRN C Y GAR BOA E K ACT IRON R G7 TH W LAMB O G5 D Y L OC 2 P IMPERIAL ON EA A ALLAS VA MOFF BUSTLEHOLM ES FECKENHAM 2 ARK W 1 T TEN L ON MANNINGT OF H STR B 2 ST H SEABANK N T 1 A TY ON U H PORT

I N6 TER 1 FOOT G 2 2 1 TELEE 1 1

KEARSLEY W R ILL DAINES K A EO ELGIN MARCHWOOD PENWOR EET N GLEN ILBR 1 ALHAM T G6 2 STR D N4 R DRAKELOW A

2 D G L DENNY I M G1 U E A D 2 1 FAR ON

A N TH E S 1 NECHELLS L5 1 R R4 D T MACCLESFIELD THAM DUNBEA N ROCHDALE A R AS C 1 2 O GR V C E MANCHESTER SOUTH F NURSLING L KE C E ET LYD A MELKSHAM P 2 MYBSTER A T4 K 2 MINETY N WLEY 2 ADIHAM ETN S 1 B ITH WHITEGA LAC LON E' TH Harestanes A S 1 2 1 1 2 1 K HUTT R6 MIL GAN WILLINGT 2 H N5 ST C I HARKER C L 2 L L THURSO LOC L 1 AL N TE Y ON Y ET D D YBRIDGE 2 1 2 E N2 E D K

B2 BERKSWELL N N O ON EAST SOU W ELLAND E HALL HAMS OR EWAR U K BRAMLEY I AS 1 1 BOTLEY 2 WOOD SH D6 N7 C CULHAM JET FLEET IN N COWLEY BLAC B3 LOVEDEAN B4 TH DIDCOT OA TH R BRADFORD WEST T T A H EA ER COVENTR OR W KI A TBR 1 2 BREDBUR TH B W 2 1 H Y K N E 2 1 L O L C I I LL AC C A I U C AR D S1 Q8 K W S U GE FOURST MAIN AMERSHAM K E FETTERESSO R D BON L NEEPSEND Y I R A L3 WEYBRIDGE WEST N SHEFFIELD CITY Y W I S3 T5 E E LALEHAM N YB ONES 2 1 P1 S R IGH FERR 2 I 2 C KIRKST D GALA 1 KAI 1 1 O GE TH P5 U CHESSINGT YBRIDGE 1 G ME P ST GRANGE SKEL I SPENNYMOOR TA NOR LL CLA EAST 2 SH R AR 2 WINCOBANK W 2 IVER S5 A OCKSBRIDGE ALL S PITSMOOR R N E D IE BUZZARD LEIGHT

1 2 3

YDON LAN G STFIE TEALI T A T EWAR EALING 1 L BRIDGE P E 1 2 ON ON LEES N 1 S A M W GU TFORD 2 D O BOLNEY A6 H U N L 1 EXTENSION DUNLA S 2 I ON ON

2 PERSLEY T SOUTH W D TE PLA G FR H ENDERBY 1 KNARESBOROUGH STI A MONK D4 1 2 2 1 H TFORD YST WIMBLEDON C OUSE BU 2 WILLESDEN TEMPLEBOROUGH 1 R 1 E ELSTREE W LIN JORDANTHORPE 2 ON R F A7 G G ALLAGO G A4 SMEA P2 1 2 2 L H 2 1 2 E P3 STELLA 1 WEST B1 MU MILL ALDW SH N BRINSWOR C C 1 RIG 3 2 FI 1 BR 1 1 1 2 1 R 1 RYS R 2 PORT D R I O T 2 WEST R A NEW CROSS BEDDINGT C E HILL D U ON L8 T P I C W H GI 1 ARKE H BH ES 2 2 T ETER 2 2 POPPLET OSBALDWICK D SUNDON 1 H A E WOOD ST AL E E EV 1 I R S O I M STFIE 1 B N MEL L 2 . JOHN’S ON SOAR RA LES 1 B BL O 1 L U

NINFIELD ON BRIMSDOWN

ELLO C GR TH H S C YTH TCLIFFE 1 AB S O 2 EAD K 2 T T S M C ON L I L ON ON Figure 2 E D W I Q5 CROSS E O D Q6 D ER ON Q7 KE R C 1 2 R R AL E YE HOUSE MOBIL ST C T R N 2 N THURCROFT 1 2 OR A 1 THAM 2 L THORNT GRENDON ETH . FERGUS ZI J6 2 1 E N 1 2 A8 L7 2 1 S E GRANGE PETERHEAD CHESTERFIELD EGGBOROUGH HURST N P4 T ROAD CITY Y ES W 1 OTTENHAM TYNEMOUTH 1 2 S LEVE ST 2 2 1 1 1 ON 2 4 . FERGUSGAS AR STRICHEN 1 3 2 2 GLEN BARDOLPH ST A9 2 N WYMONDLEY MAIN 2 B ROWDOWN 1 OKE 1 T2 MI R NOR DUNGENESS E 2 1 DRAX O HACKNEY L 3 N 1 1 2 1 FRASERBURGH A P6 J4 T 1 I 2 A3 WEST ST HAM 2 ON T T A5: GBT H THORPE REDBRIDGE ON MARSH 2 2 1 ON OFC ST SHIELDS SOUTH MARNHAM SOCON EA D5 A C R HIGH YTHORPE 1 2 U 2 T ED C4 R LITTLEBROOK ON P 1 2 A AR 2 1

W H IGI BARKING PELHAM LACKENBY 1 OU 1 2 ARLEY BRAINTREE C6 GREYST E A1 1 BARKING SE BOLDON K2 WEST KEADBY 2 WEST 1 2 2 1 BECK CREYKE ONES

T THURROCK 3 (270kV DC) OD POINT SELLINDGE C9 BUR MAIN TILBUR BRAMFORD 1 E deF 1 1 1 K5 1 J7 2 1 WELL 2 ransmission SystemETYSZones 2 2 EAST NOR 2 2 Y OFFER SINGLEWELL J8 1 COTT C1 KILLINGHOLME 2 THFLEET 1 C2 T ON AM NOR SAL J5 2 SAL WEST NOR SP KINGSNOR TEND KEMSLEY TH REFINER HUMBER ALDING THOLME TH BUR CANTERBUR NOR Q4 2 1 2 RA T 2 HAR Y TH TH ON YLEIGH MAIN 1 NOR W MAIN TLEPOOL ALPOLE 1 SAL HEDON BICKER FEN MEDW GRAIN WICH Y TEND 2 COR BRIDGE SUTT BANK HUMBER SOUTH 1 A SIZEWELL C7 YT Y BRITNED HA PIT HAR ON CLEVE HILL GRIMSBY ON WEST WTHORN indicated onthisdiagram Note: Notallradial132kVcircuitsare Legend Q2 TMOOR P8 K6 K1 K4 C3 C5 J1 P7 J3 J2 132kV Substation 275kV Substation 400kV Substation 132kV Circuit 220kV Circuit 275kV Circuit 400kV Circuit 6 7 B0 B0 B1 DOUNREAY Figure A6: GB Transmission System Boundaries

MYBSTER GRUDIE DEANIE BRIDGE CASSLEY BRORA DUNBEATH

CULLIGRAN MOSSFORD THURSO LAIRG SHIN

AIGAS LUICHART ALNESS

KILMORACK ORRIN STRICHEN ST. FERGUS NAIRN ELGIN MOBIL HARRIS KEITH PETERHEAD BEAULY FRASERBURGH DUNVEGAN INVERNESS ST. FERGUS GAS EDINBANE FASNAKYLE PERSLEY PETERHEAD FARR GRANGE WIND FARM BOAT OF GARTEN GLENFARCLAS Legend KNOCKNAGAEL B1 BROADFORD GLENDOE CRAIGIEBUCKLER 400kV Circuit BLACKHILLOCK KINTORE TARLAND 275kV Circuit DALLAS FIDDES FOYERS SHE TRANSMISSION 220kV Circuit FORT WILLIAM B2 BRECHIN GRID 132kV Circuit FORT AUGUSTUS FETTERESSO B2 ARBROATH 400kV Substation KILLIN TUMMEL 275kV Substation B3b TEALING MILTON OF CRAIGIE TAYNUILT DALMALLY 132kV Substation FERNOCH CRUACHAN ERROCHTY CHARLESTON System Boundaries INVERARAY INVERARNAN COUPAR ANGUS AN SUIDHE BURGHMUIR B4 PORT ANN SLOY LEVEN CUPAR Note: Not all radial 132kV circuits are BRACO ABERNETHY indicated on this diagram CROSSAIG GLENROTHES DUNOON

B3b CARRADALE HELENSBURGH

B4 STRATHLEVEN WESTFIELD WESTFIELD RED HOUSE WHISTLEFIELD LONGANNET WINDYHILL MOSSMORRAN DENNY GLENNISTON DRUMCHAPEL KINCARDINE WINDYHILL STIRLING DEVONSIDE BONNYBRIDGE B5 LAMBHILL ERSKINE PORT DUNDAS

DEVOLMOOR WEST GEORGE STREET BRAEHEAD PARK GRANGEMOUTH B5 CHARLOTTE STREET DALMARNOCK SIGHTHILL DEWAR PLACE SHRUBHILL EASTERHOUSE DEVOLMOOR PORTOBELLO GOVAN COATBRIDGE HUNTERSTON HAGGS ROAD CURRIE WHITEHOUSE CLYDE'S MILL EAST KILBRIDE PAISLEY NEWARTHILL GIFFNOCK KILWINNING WHITELEE BLACKLAW MEADOWHEAD KAIMES COCKENZIE BLACKLAW SMEATON NEILSTON TRANSMISSION BUSBY CRYSTAL WHITELEE EXT RIG KILMARNOCK TOWN EAST KILBRIDE SOUTH STRATHAVEN TORNESS SP WISHAW KILMARNOCK SOUTH FALLAGO

DUNLAW AYR COALBURN EXTENSION

CLYDE NORTH ELVANFOOT AUCHENCROSH HADYARD HILL CLYDE SOUTH COYLTON MOYLE MOFFAT Harestanes MARK HILL GALASHIELS ECCLES

MAYBOLE CHAPELCROSS

GLENLUCE HAWICK

KENDOON DUMFRIES B6 GRETNA FOURSTONES TYNEMOUTH SOUTH WEST OFFERTON BOLDON NEWTON STEWART GLENLEE TONGLAND 1 BLYTH 1 SHIELDS 1 2 B6 2 2 STELLA HARKER HAWTHORN B7 WEST PIT

B11 2 1 HARTMOOR LACKENBY SPENNYMOOR 1 2 SALTHOLME B16 MIDDLETON HUTTON 2 B7a 2 HEYSHAM 1 WASHWAY TOD POINT HARTLEPOOL 2 1 1 FARM 2 1 STANAH B7 1 2 GREYSTONES HEDON B7a 1 1 NORTON BRADFORD SALTEND WEST KIRKSTALL 2 2 NORTH PENWORTHAM THORNTON CREYKE KNARESBOROUGH SALTEND 1 BECK HUMBER 1 2 1 2 3 EC1 2 SKELTON REFINERY PADIHAM 2 SOUTH KIRKBY 3 1 2 RAINHILL GRANGE OSBALDWICK 1 HUMBER NW4 2 1 POPPLETON KEADBY KILLINGHOLME BANK 2 1 2 1 3 1 2 NW3 LISTER ELLAND FERRYBRIDGE 1 DRAX 3 4 GRIMSBY NW2 DRIVE FIDDLERS 2 1 1 WEST NW1 FERRY 2 2 1 2 1 ROCHDALE 3 2 CAPENHURST KEARSLEY MONK WEST BURTON 2 2 2 1 FRYSTON 1 2 EGGBOROUGH BIRKENHEAD 2 1 1 2 1 1 2 1 WHITEGATE 1 2 1 1 2 1 2 CARRINGTON 2 COTTAM STALYBRIDGE 1 2 WYLFA NEEPSEND STOCKSBRIDGE THORPE MARSH 1 2 FRODSHAM ROCKSAVAGE WEST MELTON 1 2 SOUTH PITSMOOR NW1 2 1 MANCHESTER 2 2 BODELWYDDAN 1 BREDBURY ALDWARKE EIRGRID 1 WINCOBANK 2 PENTIR DAINES THURCROFT 1 2 1 2 TEMPLEBOROUGH HIGH 1 1 MARNHAM DEESIDE CONNAH’S 2 1 DINORWIG QUAY MACCLESFIELD BRINSWORTH 2 FFESTINIOG 1 B11 NW2 1 2 SHEFFIELD 2 CITY B8 WILLINGTON EAST 1 2 B16 TRAWSFYNYDD 1 CHESTERFIELD CELLARHEAD BICKER B9 NORTON LEES NW3 JORDANTHORPE 2 FEN 1 2 STAYTHORPE EC5 1 RUGELEY STOKE SPALDING GRID NW4 2 DRAKELOW RATCLIFFE SHREWSBURY 1 BARDOLPH NORTH LEGACY 1 ON SOAR B8 IRONBRIDGE 2 2 BUSHBURY 2 WILLENHALL SUTTON 2 1 BRIDGE 1 PENN B17 1 2 EC3 OCKER COVENTRY WALPOLE HILL TIONAL 2 1 2 1 2 1 HAMS EATON HALL ENDERBY SOCON NECHELLS NA 1 1 1 2 OLDBURY 2 BISHOPS 1 NORWICH WOOD 2 2 2 BURWELL 1 KITWELL PATFORD GRENDON MAIN BUSTLEHOLM BRIDGE MAIN 2 BERKSWELL EAST 1 WYMONDLEY BRAMFORD CLAYDON SUNDON MAIN PELHAM B17 FECKENHAM 1 2 SIZEWELL B9 2 1 1 2 EC6 WALHAM AMERSHAM RYE HOUSE BRAINTREE B12 MAIN LEIGHTON RAYLEIGH MAIN BUZZARD EC5 PEMBROKE ELSTREE WARLEY 2 COWLEY 1 1 SW1 1 1 B15 RASSAU 1 1 2 2 1 2 2 2 2 2 CORYTON TILBURY CILFYNYDD IVER WATFORD WALTHAM SWANSEA NORTH CULHAM JET SOUTH CROSS 1 2 1 1 2 MILL HILL BAGLAN BRIMSDOWN 1 2 4 3 BAY 2 1 2 UPPER BOAT IMPERIAL PARK REDBRIDGE 1 2 MARGAM EALING WILLESDEN BARKING MEDWAY DIDCOT 2 2 2 2 2 2 2 MINETY TOTTENHAM USKMOUTH IRON 1 W 1 1 E1 1 1 1 2 PYLE ACTON GRAIN 1 2 1 2 LALEHAM 2 1 1 CARDIFF 2 2 EAST HACKNEY 1 2 1 2 1 WEST THURROCK 2 1 NORTHFLEET 1 2 CITY WEST BRITNED 1 ROAD 1 HAM EAST SW1 WHITSON MELKSHAM BRAMLEY 1 1 2 2 2 1 2 ST. JOHN’S BARKING KINGSNORTH TREMORFA WIMBLEDON 2 1 WOOD 1 2 1 1 HINKLEY SEABANK SINGLEWELL B10 1 2 2 1 WEST ABERTHAW POINT 1 WEYBRIDGE 2 2 HURST B13 ALVERDISCOTT NEW CROSS LITTLEBROOK TAUNTON FLEET 1 2 BRIDGWATER SC1 2 1 1 2 BEDDINGTON 2 3 B14/B14e KEMSLEY 2 1 1 2 1 AXMINSTER 2 2 MANNINGTON LOVEDEAN 2 1 2 NURSLING 1 1 ROWDOWN INDIAN CHESSINGTON QUEENS 2 EXETER 1 1 CLEVE LANDULPH CHICKERELL BOTLEY MARCHWOOD DUNGENESS SELLINDGE HILL WOOD 1 BOLNEY 2 2 2 2 2 ABHAM SC1

LANGAGE FAWLEY 2 1 NINFIELD 1 1 1 2 1 CANTERBURY NORTH B12 B15 E de F (270kV DC) B13 B10 8

DOUNREAY 2 x -60MVAr Figure A7: GB Reactive Compensation Plant

MYBSTER GRUDIE DEANIE BRIDGE CASSLEY BRORA DUNBEATH

CULLIGRAN MOSSFORD THURSO LAIRG SHIN

AIGAS LUICHART ALNESS

KILMORACK ORRIN STRICHEN ST. FERGUS NAIRN ELGIN MOBIL HARRIS KEITH PETERHEAD BEAULY FRASERBURGH

DUNVEGAN 1 x -150/+150MVAr INVERNESS ST. FERGUS GAS 2 x 45MVAr EDINBANE FASNAKYLE 2 x -90MVAr PERSLEY PETERHEAD FARR GRANGE WIND FARM BOAT OF GARTEN GLENFARCLAS Legend KNOCKNAGAEL BROADFORD GLENDOE CRAIGIEBUCKLER 400kV Circuit BLACKHILLOCK KINTORE 2 x -60MVAr TARLAND 275kV Circuit DALLAS FIDDES FOYERS SHE TRANSMISSION 220kV Circuit FORT WILLIAM BRECHIN GRID 132kV Circuit FORT AUGUSTUS 4 x -60MVAr FETTERESSO 1 x -75/225MVAr 2 x 45MVAr ARBROATH 400kV Substation KILLIN TUMMEL 2 x -30MVAr TEALING MILTON OF CRAIGIE 275kV Substation TAYNUILT DALMALLY 132kV Substation

FERNOCH CHARLESTON SVC CRUACHAN ERROCHTY MSC INVERARAY INVERARNAN COUPAR ANGUS Reactor AN SUIDHE Series Capacitor BURGHMUIR

PORT ANN SLOY LEVEN CUPAR Note: Not all radial 132kV circuits are BRACO ABERNETHY indicated on this diagram CROSSAIG GLENROTHES 2 x -60MVAr DUNOON

CARRADALE HELENSBURGH

STRATHLEVEN WESTFIELD WESTFIELD 1 x 225MVAr RED HOUSE WHISTLEFIELD 1 x 150MVAr LONGANNET WINDYHILL MOSSMORRAN DENNY GLENNISTON DRUMCHAPEL KINCARDINE WINDYHILL STIRLING DEVONSIDE 1 x -60MVAr BONNYBRIDGE LAMBHILL ERSKINE PORT DUNDAS

DEVOLMOOR WEST GEORGE STREET 2 x -60MVAr BRAEHEAD PARK GRANGEMOUTH CHARLOTTE STREET DALMARNOCK SIGHTHILL DEWAR PLACE SHRUBHILL 2 x -60MVAr EASTERHOUSE 1 x -60MVAr 2 x -60MVAr DEVOLMOOR PORTOBELLO GOVAN COATBRIDGE HUNTERSTON HAGGS ROAD CURRIE WHITEHOUSE CLYDE'S MILL EAST KILBRIDE PAISLEY NEWARTHILL GIFFNOCK KILWINNING WHITELEE BLACKLAW MEADOWHEAD 1 x -60MVAr KAIMES COCKENZIE BLACKLAW SMEATON NEILSTON TRANSMISSION 1 x -50MVAr BUSBY CRYSTAL WHITELEE EXT RIG KILMARNOCK TOWN EAST KILBRIDE SOUTH STRATHAVEN TORNESS SP WISHAW 2 x -150MVAr KILMARNOCK SOUTH 1 x -60MVAr FALLAGO

DUNLAW AYR COALBURN EXTENSION

CLYDE NORTH ELVANFOOT AUCHENCROSH HADYARD HILL 1 x 225MVAr CLYDE SOUTH COYLTON MOYLE MOFFAT Harestanes MARK HILL 1 x 225MVAr GALASHIELS ECCLES

MAYBOLE CHAPELCROSS

GLENLUCE HAWICK

KENDOON DUMFRIES GRETNA 1 x -60MVAr FOURSTONES 2 x 150MVAr TYNEMOUTH SOUTH WEST OFFERTON BOLDON NEWTON STEWART GLENLEE TONGLAND 1 BLYTH 1 SHIELDS 1 2 2 2 1 x 60MVAr STELLA HAWTHORN HARKER 2 x 225MVAr WEST 2 x -75/+150MVAr PIT 3 x 225MVAr 1 x 150MVAr 1 x -100MVAr 2 1 HARTMOOR LACKENBY SALTHOLME MIDDLETON SPENNYMOOR 1 2 3 x 20MVAr HUTTON 1 x -60MVAr 1 x 225MVAr 2 2 x 35% 2 HEYSHAM 1 WASHWAY TOD POINT HARTLEPOOL 2 1 1 FARM 2 1 STANAH 1 x 60MVAr 1 2 2 x -60MVAr 1 x 150MVAr GREYSTONES HEDON 1 x -45/+45MVAr 1 1 NORTON BRADFORD 2 x -60MVAr SALTEND WEST KIRKSTALL 3 x 20MVAr 2 2 NORTH PENWORTHAM THORNTON CREYKE KNARESBOROUGH SALTEND 1 x -60MVAr 1 BECK HUMBER 1 2 1 2 3 2 SKELTON REFINERY PADIHAM 2 SOUTH KIRKBY 3 1 2 RAINHILL GRANGE OSBALDWICK 4 x 45MVAr 1 4 x 45MVAr 3 x 60MVAr HUMBER 2 1 1 x 150MVAr POPPLETON KEADBY KILLINGHOLME BANK 2 1 1 x -100MVAr 2 x -60MVAr 2 1 3 1 2 LISTER ELLAND FERRYBRIDGE 1 DRAX 3 4 1 x -60MVAr GRIMSBY DRIVE FIDDLERS 1 2 1 1 x -100MVAr WEST FERRY 2 2 1 3 x 60MVAr 2 1 ROCHDALE 1 x 150MVAr 3 1 x -200MVAr 2 CAPENHURST KEARSLEY MONK WEST BURTON 2 2 2 1 FRYSTON 1 2 EGGBOROUGH BIRKENHEAD 2 1 3 x 60MVAr 1 x 150MVAr 1 2 1 x -60MVAr 1 1 x -60MVAr 1 2 1 WHITEGATE 1 x 150MVAr 1 2 2 x -60MVAr 1 1 2 1 2 COTTAM 1 x 60MVAr CARRINGTON 2 STALYBRIDGE 1 x -200MVAr 1 2 WYLFA NEEPSEND STOCKSBRIDGE 3 x 45MVAr THORPE MARSH 1 2 FRODSHAM ROCKSAVAGE WEST MELTON 1 PITSMOOR 2 SOUTH 2 x -60 to -30MVAr 2 1 MANCHESTER 2 2 1 x -200MVAr BODELWYDDAN 1 BREDBURY ALDWARKE 2 x -60MVAr 1 x -100MVAr EIRGRID 1 WINCOBANK 2 PENTIR DAINES THURCROFT 1 2 1 2 TEMPLEBOROUGH HIGH 1 1 MARNHAM DEESIDE CONNAH’S 2 1 DINORWIG QUAY MACCLESFIELD BRINSWORTH 1 x -60MVAr 2 FFESTINIOG 1 1 2 2 x -75/150MVAr 1 x -75/+150MVAr SHEFFIELD 2 2 x 225MVAr 1 x 225MVAr CITY 4 x 60MVAr WILLINGTON EAST 1 2 2 x -60MVAr TRAWSFYNYDD 1 CHESTERFIELD CELLARHEAD BICKER NORTON LEES JORDANTHORPE 2 FEN 1 x -75/+150MVAr 1 x -60MVAr 1 x 225MVAr 1 2 1 x -60 to -30MVAr 1 2 x 225MVAr STAYTHORPE RUGELEY 1 x -200MVAr 1 x 225MVAr STOKE SPALDING GRID 2 2 x -60MVAr DRAKELOW RATCLIFFE SHREWSBURY 1 BARDOLPH NORTH LEGACY 1 ON SOAR IRONBRIDGE 2 3 x 60MVAr 2 BUSHBURY 1 x 150MVAr 2 1 x -60MVAr 3 x 60MVAr 1 x 225MVAr 1 x -60MVArWILLENHALL SUTTON 2 1 BRIDGE 1 PENN 1 x 0/+60MVAr 1 2 OCKER COVENTRY WALPOLE HILL 1 x 0/+60MVAr TIONAL 1 x 150MVAr 3 x 60MVAr 2 1 2 1 3 x 60MVAr 2 1 HAMS 1 x -60MVAr 2 x 225MVAr 3 x 60MVAr EATON 2 x -60MVAr HALL ENDERBY 4 x 225MVAr SOCON NECHELLS 1 x 0/+60MVAr 1 x -60MVAr

NA 1 1 1 3 x 60MVAr 2 OLDBURY 2 x 225MVAr 2 BISHOPS 1 x 0/+60MVAr 1 x 150MVAr 1 NORWICH WOOD 2 2 2 x -60MVAr 2 BURWELL 1 KITWELL 1 x -60MVAr PATFORD GRENDON MAIN MAIN 3 x 60MVAr BUSTLEHOLM BRIDGE 3 x 60MVAr 1 x 20MVAr 2 x 225MVAr 2 2 x -60MVAr BERKSWELL 1 x -50/+225MVAr 2 x 225MVAr 2 x -75/+150MVAr 1 x 60MVAr EAST 1 2 x -60MVAr WYMONDLEY 2 x -60MVAr BRAMFORD 1 x -75/+150MVAr SUNDON 4 x -60MVAr CLAYDON MAIN PELHAM 3 x 60MVAr 1 x -60MVAr FECKENHAM 1 2 SIZEWELL 2 x 225MVAr 2 1 1 2 1 x -200MVAr WALHAM AMERSHAM RYE HOUSE BRAINTREE MAIN LEIGHTON 2 x 0/+60MVAr RAYLEIGH MAIN BUZZARD 1 x -200MVAr 1 x -60MVAr PEMBROKE ELSTREE WARLEY 2 3 x 60MVAr COWLEY 1 2 x -60MVAr 1 2 x -60MVAr 1 1 RASSAU 2 x -60MVAr 3 x 60MVAr 1 1 2 2 x -200MVAr 2 1 2 2 2 2 3 x 60MVAr 2 CORYTON TILBURY CILFYNYDD IVER WATFORD WALTHAM SWANSEA NORTH CULHAM JET 2 x -60MVAr SOUTH CROSS 3 x 60MVAr 1 2 1 1 x -200MVAr 1 2 MILL HILL 2 x -60MVAr BAGLAN BRIMSDOWN 1 2 4 3 BAY 2 1 2 UPPER BOAT IMPERIAL PARK REDBRIDGE 1 2 MARGAM EALING WILLESDEN BARKING MEDWAY 2 x -60MVAr 2 1 x 45MVAr DIDCOT 2 2 2 2 2 2 1 x 45MVAr 2 x 0/+60MVAr MINETY TOTTENHAM USKMOUTH IRON 1 W 1 1 E1 1 1 1 2 PYLE ACTON 3 x -100MVAr GRAIN 1 x -200MVAr 1 2 LALEHAM 2 2 x 0/+60MVAr 1 2 1 2 x -100MVAr 1 CARDIFF 1 x -60MVAr 2 2 1 EAST 2 x +60MVAr HACKNEY 2 1 3 x 60MVAr 2 1 1 x -200MVAr WEST THURROCK 2 1 2 x -60MVAr 2 x -100/150MVAr CITY WEST NORTHFLEET BRITNED 1 2 3 x 60MVAr 1 x -200MVAr 1 ROAD 1 HAM EAST WHITSON MELKSHAM BRAMLEY 3 x -200MVAr 1 1 2 2 2 1 2 ST. JOHN’S BARKING KINGSNORTH TREMORFA WIMBLEDON 1 x 225MVAr 2 x -60MVAr 1 x -200MVAr 2 1 WOOD 1 2 2 x -100M1 VAr 1 1 x -200MVAr 4 x -30MVAr HINKLEY SEABANK SINGLEWELL 1 2 2 1 WEST ABERTHAW POINT 2 x 60MVAr 1 1 x 225MVAr WEYBRIDGE 2 2 HURST ALVERDISCOTT NEW CROSS 1 x +150MVAr LITTLEBROOK 1 x 60MVAr TAUNTON 3 x 60MVAr FLEET 2 x -100MVAr 1 2 BRIDGWATER 2 x -60MVAr 2 x -60MVAr 1 x -74/+150MVAr 2 4 x -100MVAr 1 1 2 2 x -60MVAr BEDDINGTON 2 1 x 0/+60MVAr 3 KEMSLEY 2 1 2 x -200MVAr 1 1 2 2 x 45MVAr 1 x 225MVAr AXMINSTER 2 2 MANNINGTON LOVEDEAN 2 1 2 NURSLING 1 INDIAN 1 2 x -100MVAr ROWDOWN CHESSINGTON 4 x -60MVAr QUEENS 2 EXETER 1 2 x -75/+150MVAr 1 1 x 225MVAr 2 x -75/+150MVAr 2 x 150MVAr LANDULPH CHICKERELL 6 x 60MVAr 2 x -150/+150MVAr CLEVE 3 x 60MVAr 1 x 50MVAr MARCHWOOD BOTLEY DUNGENESS HILL 1 x -200MVAr 1 x 0/+60MVAr BOLNEY SELLINDGE 2 2 x 20MVAr 1 x -60MVAr WOOD 1 2 2 2 2 1 x -60MVAr 1 x 56MVAr ABHAM 1 x 225MVAr 2 x -30MVAr 2 x 45MVAr LANGAGE FAWLEY 2 4 x 60MVAr 1 NINFIELD 1 1 1 2 1 CANTERBURY 1 x 225MVAr 1 x -150/+150MVAr NORTH 2 x -60MVAr -200MVAr E de F (270kV DC)