Electricity Ten Year Statement 2020 Electricity Ten Year Statement 2020 1 Appendix Contents

To demonstrate the impact of future changes on the transmission network a set of winter peak power flow C diagrams are presented in Appendix C. These show snapshots of present and future power flows along major circuit routes for the Leading the Way Scenario as well as future reinforcements based on 2019 NOA results. New transmission circuits and substations that Power flow diagrams are still to be built are shown in the future year’s diagrams. They represent one scenario and could change. The diagrams are not completely geographically precise and should not be used for detailed planning purposes.

Appendix C

C1 – GB Power Flow Diagram Leading the Way 2020/21...... 2 C2 – GB Power Flow Diagram Leading the Way 2022/23...... 3 C3 – GB Power Flow Diagram Leading the Way 2024/25...... 4 C4 – GB Power Flow Diagram Leading the Way 2026/27...... 5 C5 – GB Power Flow Diagram Leading the Way 2029/30...... 6 A ppendi x C x C ppendi A 2 Figure C1: GB Power Flow Diagram Leading the Way 2020/21

Substation

400kV Substations 275 kV Substations 132kV Substations

Circuit 400kV 275kV 220kV 132kV Thurso South Offshore AC Cable Connagil Spittal 200 Offshore DC Cable 39 Mybster Interconnector (as of September 2020 IC register) Beatrice Cassley Stornoway Dunbeath Gordonbush Strathbrora Offshore Wind Projects Lairg Brora Round 1 Harris Loch Buidhe Shin Caithness Moray HVDC Round 2 Grudie Bridge Mossford Fyrish Alness Round 2.5 Corriemoillie Luichart Orrin 98 Elgin Dorenell Macduff St. Fergus Ardmore Keith Deanie 23 Round 3 Culligran Dingwall Nairn Aigas Kilmorack Inverness Blackhillock Dunvegan Beauly 132 514 526 Hywind Scottish Territorial Waters Sites Fasnakyle Knocknagael Dyce Persley Kintore Glen Willowdale Broadford 12 Morrison Tomatin Caennacroc Foyers Woodhill Network Information ClayhillsAberdeen Fort Augustus Boat of Quoich Garten Craigiebuckler Glendoe Redmoss Uprate / Reconductor Circuit Invergarry SCOTTISH HYDRO-ELECTRIC 847 Fetteresso Melgarve TRANSMISSION New Circuit / Network changes Kinlochleven Tummel Fiddes Kincardine 1234 Power Flow MW Fort William Errochty 612 Errochty 677 Brechen Rannoch Flow Direction 24 Clunie Tummel Bridge Tealing Dudhope Arbroath Note 1: The power flows shown in this diagram represent the transfers as Lochay Cashlie Lyndhurst Milton of Craigie per the ETYS model exchange which represents a typical winter peak power Taynuilt Killin Charleston Dalmally Finlarig Cruachan Glenagnes Dudhope flow scenario. 1025 Burghmuir 543 St. Fillans Note 2: The network is intact and no boundary constraints applied. Nant Clachan Inverarnan 575 Cupar Note 3: Geographic drawings of the NETS are to be taken as an approximate Inveraray Sloy Glenrothes location of assets. 164 Leven 150 Devonside Westfield Redhouse Note 4: The future reinforcements shown in pink are based on NOA 2019/20. Whistlefield Kincardine Stirling Dunfemline Glenniston Denny Note 5: Connection year for Interconnectors and offshore wind farms are Port Ann Longannet Inverkeithing Helensburgh Bonnybridge Grangemouth Dunbar Innerwick based on Interconnector Register and TEC register contracted dates. Dunoon Spango Cumbernald Telford Rd. Shrubhill Cockenzie Bainsford Gorgie Portobelllo Crystal Rig Torness Valley Strathleven Windyhill 711 Broxburn Dewar Place Erskine Lambhill Drumcross Sighthill Whitehouse Bathgate Kaimes Devol Easterhouse Currie Fallago Livingston Smeaton Moor Coatbridge Crossaig Newarthill 859 Hunterston Neilston Clydes Mill 406 NorthHunterston Strathaven Black Law Extension Dunlaw Extension Berwick East Marshall Meadows 120 Busby Black Law Hunterston Farm East 6 Whitelee Wishaw Hunterston Kilwinning Kilbride Kilmarnock Saltcoats Whitelee ExtnSouth Linnmill Town Eccles Meadowhead Carradale Kilmarnock Coalburn SP TRANSMISSION LTD Galashiels South Ayr 314 125 Clyde (North) Coylton 861 Clyde (South) Hawick New Cumnock Elvanfoot Maybole Moffat Black Hill Glenglass Auchenwynd Harestanes Hadyard Dunhill 377 Dersalloch Moyle Carsfad Ewe Hill 150 Kendoon Blackcraig To Northern Ireland Markhill Blyth Glenlee Gretna Arecleoch Dumfries Ecclefechan Auchencrosh Fourstones Newton Earlstoun Stewart Tynemouth Chapelcross398 Harker South Shields 37 76 Stella West West Boldon Glenluce Tongland Offerton Hawthorn Pit Hartmoor Spennymoor Hartlepool Saltholme Tod Point Teesside Norton Robin Rigg Greystones Grangetown 2200 161 Lackenby NATIONAL GRID ELECTRICITY TRANSMISSION 173 Western Hutton HVDC Walney 391 Extension Link Ormonde

Quernmore Walney I & II Heysham Osbaldwick Knaresborough West of Duddon Sands Middleton Barrow Bradford Thornton Hornsea West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk 660 Fryston951 Saltend North Hedon Penwortham Drax Humber Gateway 255 Elland Saltend South East West Ferrybridge Eggborough 787 Rochdale To Ireland Washway Keadby Humber Refinery Farm Kearsley Whitegate Templeborough Thorpe Lister 703 Killingholme Burbo West Marsh South Drive Rainhill Bank I&II Carrington Stalybridge Melton Humber Grimsby West Gwynt y Mor Kirkby Pitsmoor West Wylfa South Stocksbridge Aldwarke Bank Manchester Winco Bank Burton Birkenhead Bredbury Neepsend Thurcroft Fiddlers North Hoyle Rocksavage Daines Sheffield City Ferry Brinsworth Cottam Race Bank Dudgeon Flintshire Frodsham Jordanthorpe Bodelwyddan Bridge Norton Lees Pentir Macclesfield Inner Dowsing Capenhurst Chesterfield Lincs High Dinorwig Connah’s Quay 1252 Marnham Sheringham Shoal 1825 Staythorpe Lynn Legacy Ffestiniog Cellarhead Stoke Bardolph 750 Bicker Fen 271 Ratcliffe 1258 Willington on Soar Trawsfynydd 860 1491 1615 Rugeley Drakelow Walpole East Anglia Spalding North Scroby sands Sutton Necton Ironbridge Ryhall Norwich Main Bushbury Bridge Willenhall Shrewsbury Penn Bustleholm Enderby Hams Hall Ocker Hill 1914 Nechells Coventry 1528 Oldbury 1189 Kitwell Berkswell 401

Burwell Main Sizewell Feckenham Grendon Bishops Wood Eaton 704 Socon 1671 Patford Bramford Bridge1153 370 Greater Gabbard 152 Sundon East Claydon Pelham Braintree Wymondley Leighton Buzzard Greater Gabbard 2nd part (Galloper) Rassau 660 Walham Bulls Lodge 605 Rye House Rhigos Imperial Brimsdown Park Waltham Cross Gunfleet Sands I&II 286 Cowley Highbury 1138 To Netherlands Swansea North Watford Elstree Pembroke Amersham Main Hackney BritNed Cilfynydd Culham Tottenham Redbridge Rayleigh Main Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Willesden Margam Iron Acton Coryton Iver Kensal Green West Ham Whitson Barking Pyle Ealing Pudding St Johns City Rd Mill Tilbury Grain Wood Hurst West Thurrock Thanet Seabank Kentish Flats Wimbledon New Cross 1383 Northfleet Tremorfa Laleham Littlebrook Kingsnorth 1303 East Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham Chessington Richborough East Bramley West Weybridge Beddington Rowdown To Belgium 954 NEMO 709 Fleet Canterbury 296 North 591 Hinkley Point Sellindge West Sellindge Bridgwater Alverdiscott 318 275 Bolney 31 Taunton Nursling 355 982 678 Dungeness Marchwood 619 Mannington Chilling Lovedean Ninfield Axminster 151 Fawley Botley Wood Exeter 181

25 Chickerell To France IFA Rampion Langage Abham

Indian Queens Landulph

To France IFA2 3 Figure C2: GB Power Flow Diagram Leading the Way 2022/23

Substation

400kV Substations 275 kV Substations 132kV Substations

Circuit 400kV 275kV 220kV 132kV Dounreay Thurso South Offshore AC Cable Connagil Spittal 200 Offshore DC Cable 87 Mybster Interconnector (as of September 2020 IC register) Beatrice Cassley Stornoway Dunbeath Gordonbush Strathbrora Offshore Wind Projects Lairg Moray Firth Brora Round 1 Harris Loch Buidhe Shin Caithness Moray HVDC Round 2 Grudie Bridge Mossford Fyrish Alness Round 2.5 Corriemoillie Fraserburgh Luichart Orrin 146 Elgin Dorenell Macduff St. Fergus Ardmore Keith Deanie 10 Round 3 Culligran Dingwall Strichen Nairn New Deer Aigas Kilmorack Inverness Blackhillock Dunvegan Peterhead Beauly 70 396 Hywind Rothiernorman 586 Scottish Territorial Waters Sites Fasnakyle Knocknagael Dyce Persley Kintore Glen Willowdale Broadford 13 Morrison Tomatin Caennacroc Foyers Woodhill Network Information ClayhillsAberdeen Fort Augustus Boat of Quoich Garten Tarland Craigiebuckler Glendoe Redmoss Uprate / Reconductor Circuit Invergarry SCOTTISH HYDRO-ELECTRIC 1039 Fetteresso Melgarve TRANSMISSION New Circuit / Network changes Kinlochleven Tummel Fiddes Kincardine 1234 Power Flow MW Fort William Errochty Power Station 694 Errochty 829 Brechen Rannoch Flow Direction 64 Clunie Tummel Bridge Tealing Dudhope Arbroath Note 1: The power flows shown in this diagram represent the transfers as Lochay Cashlie Lyndhurst Milton of Craigie per the ETYS model exchange which represents a typical winter peak power Taynuilt Killin Charleston Dalmally Finlarig Cruachan Glenagnes Dudhope Inch Cape flow scenario. 1242 Burghmuir 941 St. Fillans Note 2: The network is intact and no boundary constraints applied. Nant Clachan Inverarnan 873 Cupar Note 3: Geographic drawings of the NETS are to be taken as an approximate Inveraray Sloy Glenrothes location of assets. 160 Leven 142 Devonside Westfield Neart na Gaolthe Redhouse Note 4: The future reinforcements shown in pink are based on NOA 2019/20. Whistlefield Kincardine Stirling Dunfemline Glenniston Denny Mossmorran Note 5: Connection year for Interconnectors and offshore wind farms are Port Ann Longannet Inverkeithing Helensburgh Bonnybridge Grangemouth Dunbar Innerwick based on Interconnector Register and TEC register contracted dates. Dunoon Spango Cumbernald Telford Rd. Shrubhill Cockenzie Bainsford Gorgie Portobelllo Crystal Rig Torness Valley Strathleven Windyhill Broxburn Dewar Place Erskine Lambhill1197 Drumcross Sighthill Whitehouse Bathgate Kaimes Devol Easterhouse Currie Fallago Livingston Smeaton Moor Coatbridge Crossaig Newarthill 1334 Hunterston Neilston Clydes Mill 358 NorthHunterston Strathaven Black Law Extension Dunlaw Extension Berwick East Marshall Meadows 158 Busby Black Law Hunterston Farm East 502 Whitelee Wishaw NSL Hunterston Kilwinning Kilbride Kilmarnock Saltcoats Whitelee ExtnSouth Linnmill Town Eccles To Norway Meadowhead Carradale Kilmarnock Coalburn SP TRANSMISSION LTD Galashiels South Ayr 497 Clyde (North) Coylton 1092 1870 Clyde (South) Hawick New Cumnock Elvanfoot Maybole Moffat Black Hill Glenglass Auchenwynd Harestanes Hadyard Dunhill 1362 Dersalloch Moyle Carsfad Ewe Hill 183 Kendoon Blackcraig To Northern Ireland Markhill Blyth Glenlee Gretna Arecleoch Kilgallioch Dumfries Ecclefechan Auchencrosh Fourstones Newton Earlstoun Stewart 101 Tynemouth Chapelcross1392 Harker South Shields 45 Stella West West Boldon Glenluce Tongland Offerton Hawthorn Pit Hartmoor Spennymoor Hartlepool Saltholme Tod Point Teesside Norton Robin Rigg Greystones Grangetown 1155 2200 Lackenby NATIONAL GRID ELECTRICITY TRANSMISSION 862 Western Hutton HVDC Walney 1198 Extension Link Ormonde

Quernmore Walney I & II Heysham Osbaldwick Knaresborough West of Duddon Sands Middleton Barrow Bradford Thornton Hornsea West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk 54 Fryston1842 Saltend North Hedon Penwortham Drax Humber Gateway 475 Elland Saltend South East West Ferrybridge Eggborough Rochdale To Ireland 1001 Washway Keadby Humber Refinery Farm Kearsley Whitegate Templeborough Thorpe Lister Killingholme Triton Knoll Burbo 398 West Marsh South Drive Rainhill Bank I&II Carrington Stalybridge Melton Humber Grimsby West Gwynt y Mor Kirkby Pitsmoor West Wylfa South Stocksbridge Aldwarke Bank Viking Manchester Winco Bank Burton Birkenhead Bredbury Neepsend Thurcroft Rhyl Flats Fiddlers To North Hoyle Rocksavage Daines Sheffield City Ferry Brinsworth Cottam Race Bank Dudgeon Flintshire Frodsham Jordanthorpe Bodelwyddan Bridge Norton Lees Pentir Macclesfield Inner Dowsing Capenhurst Chesterfield Lincs High Dinorwig Connah’s Quay 1241 Marnham Sheringham Shoal 2019 Staythorpe Lynn Legacy Ffestiniog Cellarhead Stoke Bardolph 530 Bicker Fen 283 Ratcliffe 1466 Willington on Soar Trawsfynydd 924 1823 1476 Rugeley Drakelow Walpole East Anglia Spalding North Scroby sands Sutton Necton Ironbridge Ryhall Norwich Main Bushbury Bridge Willenhall Shrewsbury Penn Bustleholm Enderby Hams Hall Ocker Hill Nechells Coventry 1540 1863 Oldbury 1133 Kitwell Berkswell 371

Burwell Main Sizewell Feckenham Grendon Bishops Wood Eaton 818 Socon 1618 Patford Bramford Bridge 930 376 Greater Gabbard 575 Sundon East Claydon Pelham Braintree Wymondley Leighton 254 Buzzard Greater Gabbard 2nd part (Galloper) Rassau Walham Bulls Lodge 773 Rye House Rhigos Imperial Brimsdown Park Waltham Cross Gunfleet Sands I&II 73 Cowley Highbury 1124 To Netherlands Swansea North Watford Elstree London Array Pembroke Amersham Main Hackney BritNed Cilfynydd Culham Tottenham Redbridge Rayleigh Main Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Willesden Margam Iron Acton Coryton Iver Kensal Green West Ham Whitson Barking Pyle Ealing Pudding St Johns City Rd Mill Tilbury Grain Wood Hurst West Thurrock Thanet Seabank Kentish Flats Wimbledon New Cross 1236 Northfleet Tremorfa Laleham Littlebrook Kingsnorth 749 East Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham Chessington Richborough East Bramley West Weybridge Beddington Rowdown To Belgium 1628 385 Fleet Canterbury NEMO 135 North 1021 Hinkley Point Sellindge West Sellindge Bridgwater Alverdiscott 302 68 Bolney 101 Taunton Nursling 445 1051 759 Dungeness Marchwood Mannington Chilling Lovedean Ninfield 488 Axminster 143 Fawley Botley Wood Eleclink Exeter 22 To France

71 Chickerell To France IFA Rampion Langage Abham

Indian Queens Landulph

To France IFA2 4 Figure C3: GB Power Flow Diagram Leading the Way 2024/25

Substation

400kV Substations 275 kV Substations 132kV Substations

Circuit 400kV 275kV 220kV 132kV Dounreay Thurso South Offshore AC Cable Connagil Spittal 200 Offshore DC Cable 143 Mybster Interconnector (as of September 2020 IC register) Beatrice Cassley Stornoway Dunbeath Gordonbush Strathbrora Offshore Wind Projects Lairg Moray Firth Brora Round 1 Harris Loch Buidhe Shin Caithness Moray HVDC Round 2 Grudie Bridge Mossford Fyrish Alness Round 2.5 Corriemoillie Fraserburgh Luichart Orrin 280 Elgin Dorenell Macduff St. Fergus Ardmore Keith Deanie 10 Round 3 Culligran Dingwall Strichen Nairn New Deer Aigas Kilmorack Inverness Blackhillock Dunvegan Peterhead Beauly 567 Hywind 81 Rothiernorman 685 Scottish Territorial Waters Sites Fasnakyle Knocknagael Dyce Persley Kintore Glen Willowdale Broadford 12 Morrison Tomatin Caennacroc Foyers Woodhill Network Information ClayhillsAberdeen Fort Augustus Boat of Quoich Garten Tarland Craigiebuckler Glendoe Redmoss Uprate / Reconductor Circuit Invergarry SCOTTISH HYDRO-ELECTRIC 1328 Fetteresso Melgarve TRANSMISSION New Circuit / Network changes Kinlochleven Tummel Fiddes Kincardine 1234 Power Flow MW Fort William Errochty Power Station 850 Errochty 1215 Brechen Rannoch Flow Direction 77 Clunie Alyth Tummel Bridge Tealing Dudhope Arbroath Note 1: The power flows shown in this diagram represent the transfers as Lochay Cashlie Lyndhurst Milton of Craigie per the ETYS model exchange which represents a typical winter peak power Taynuilt Killin Charleston Dalmally Finlarig Cruachan Glenagnes Dudhope Inch Cape flow scenario. 1512 Burghmuir1138 St. Fillans Note 2: The network is intact and no boundary constraints applied. Nant Clachan Inverarnan 1223 Cupar Note 3: Geographic drawings of the NETS are to be taken as an approximate Inveraray Sloy Glenrothes Firth of Forth location of assets. 180 Leven 127 Devonside Westfield Redhouse Neart na Gaolthe Note 4: The future reinforcements shown in pink are based on NOA 2019/20. Whistlefield Kincardine Stirling Dunfemline Glenniston Denny Mossmorran Note 5: Connection year for Interconnectors and offshore wind farms are Port Ann Longannet Inverkeithing Helensburgh Bonnybridge Grangemouth Dunbar Innerwick based on Interconnector Register and TEC register contracted dates. Dunoon Spango Cumbernald Telford Rd. Shrubhill Cockenzie Bainsford Gorgie Portobelllo Crystal Rig Torness Valley Strathleven Windyhill 1549 Broxburn Dewar Place Erskine Lambhill Drumcross Sighthill Whitehouse Bathgate Kaimes Devol Easterhouse Currie Fallago Livingston Smeaton Moor Coatbridge Crossaig Newarthill 1539 Hunterston Neilston Clydes Mill 294 NorthHunterston Strathaven Black Law Extension Dunlaw Extension Berwick East Marshall Meadows 200 Busby Black Law Hunterston Farm East Whitelee Wishaw 788 NSL Hunterston Kilwinning Kilbride Kilmarnock Saltcoats Whitelee ExtnSouth Linnmill Town Eccles To Norway Meadowhead Carradale Kilmarnock Coalburn SP TRANSMISSION LTD Galashiels South Ayr 1088 1587 Clyde (North) Coylton 2375 Clyde (South) Hawick New Cumnock Elvanfoot Maybole Moffat Black Hill Glenglass Auchenwynd Harestanes Hadyard Dunhill Dersalloch Moyle Carsfad 1911 Ewe Hill Dogger Bank 320 Kendoon Blackcraig To Northern Ireland Markhill Blyth Glenlee Gretna Arecleoch Kilgallioch Dumfries Ecclefechan Auchencrosh Fourstones Newton Earlstoun Stewart 2001 170 Tynemouth 74 Chapelcross Harker South Shields Stella West West Boldon Glenluce Tongland Offerton Hawthorn Pit Hartmoor Spennymoor Hartlepool Saltholme Tod Point Teesside Norton Robin Rigg Greystones Grangetown 2200 1724 Lackenby NATIONAL GRID ELECTRICITY TRANSMISSION 654 Western Hutton HVDC Walney 977 Extension Link Ormonde

Quernmore Walney I & II Heysham Osbaldwick Knaresborough West of Duddon Sands Middleton Barrow Bradford Thornton 1067 Hornsea West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk Fryston2432 Saltend North Hedon Penwortham Drax Humber Gateway 346 Elland Saltend South East West Ferrybridge Eggborough Rochdale To Ireland 933 Washway Keadby Humber Refinery Farm Kearsley Whitegate Templeborough Thorpe Lister Killingholme Triton Knoll Burbo 975 West Marsh South Drive Rainhill Bank I&II Carrington Stalybridge Melton Humber Grimsby West Gwynt y Mor Kirkby Pitsmoor West Wylfa South Stocksbridge Aldwarke Bank Viking Manchester Winco Bank Burton Birkenhead Bredbury Neepsend Thurcroft Rhyl Flats Fiddlers To Denmark North Hoyle Rocksavage Daines Sheffield City Ferry Brinsworth Cottam Race Bank Dudgeon Flintshire Frodsham Jordanthorpe Bodelwyddan Bridge Norton Lees Pentir Macclesfield Inner Dowsing Capenhurst Chesterfield Lincs High Dinorwig Connah’s Quay 1088 Marnham Sheringham Shoal 2058 Staythorpe Lynn Legacy Ffestiniog Cellarhead Stoke Bardolph 163 Bicker Fen 289 Ratcliffe 1771 Willington on Soar Trawsfynydd 942 1869 1483 Rugeley Drakelow Walpole East Anglia Spalding North Scroby sands Sutton Necton Ironbridge Ryhall Norwich Main Bushbury Bridge Willenhall Shrewsbury Penn Bustleholm Enderby Hams Hall Ocker Hill Nechells Coventry 1667 2159 Oldbury 1232 Kitwell Berkswell 447

Burwell Main Sizewell Feckenham Grendon Bishops Wood Eaton Greenlink 526 Socon 1924 NeuConnect To Ireland Patford Bramford To Germany Bridge 1061 613 Greater Gabbard 597 Sundon East Claydon Pelham Braintree Wymondley Leighton Buzzard Greater Gabbard 2nd part (Galloper) Rassau 154 Walham Bulls Lodge 1064 Rye House Rhigos Imperial Brimsdown Park Waltham Cross Gunfleet Sands I&II 177 Cowley Highbury 1548 To Netherlands Swansea North Watford Elstree London Array Pembroke Amersham Main Hackney BritNed Cilfynydd Culham Tottenham Redbridge Rayleigh Main Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Willesden Margam Iron Acton Coryton Iver Kensal Green West Ham Whitson Barking Pyle Ealing Pudding St Johns City Rd Mill Tilbury Grain Wood Hurst West Thurrock Thanet Seabank Kentish Flats Wimbledon New Cross 1268 Northfleet Tremorfa Laleham Littlebrook Kingsnorth 761 East Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham Chessington Richborough East Bramley West Weybridge Beddington Rowdown To Belgium 1201 31 Fleet Canterbury NEMO 663 North 643 Hinkley Point Sellindge West Sellindge Bridgwater Alverdiscott 263 279 Bolney 71 Taunton Nursling 414 1021 To France 729 Dungeness Gridlink Marchwood Mannington Chilling Lovedean Ninfield 166 Axminster 109 Fawley Botley Wood Eleclink Exeter 349 To France To France 119 Chickerell IFA Rampion Langage Abham

Indian Queens Landulph

Aquind To France

To France To France IFA2 FAB Link 5 Figure C4: GB Power Flow Diagram Leading the Way 2026/27

Substation

400kV Substations 275 kV Substations 132kV Substations

To Shetland Circuit 400kV 275kV 290 220kV 132kV Dounreay Thurso South Offshore AC Cable Connagil Spittal 200 Offshore DC Cable 332 Mybster Interconnector (as of September 2020 IC register) Beatrice Cassley Stornoway Dunbeath Gordonbush Strathbrora Offshore Wind Projects 160 Lairg Moray Firth Brora Round 1 Harris Loch Buidhe Shin Caithness Moray HVDC Round 2 Grudie Bridge Mossford Norwegian Fyrish Alness To Norway Round 2.5 Corriemoillie Fraserburgh Luichart Orrin 450 Elgin Dorenell Macduff St. Fergus Ardmore Keith 81 Deanie 44 Round 3 Culligran Dingwall Strichen Nairn New Deer Aigas Kilmorack Inverness Blackhillock Dunvegan Peterhead Beauly 600 180 Hywind 379 Rothiernorman Scottish Territorial Waters Sites Fasnakyle Knocknagael Dyce Persley Kintore Glen Willowdale Broadford 24 Morrison Tomatin Caennacroc Foyers Woodhill Network Information ClayhillsAberdeen Fort Augustus Boat of Quoich Garten Tarland Craigiebuckler Glendoe Redmoss Uprate / Reconductor Circuit Invergarry SCOTTISH HYDRO-ELECTRIC 1540 Fetteresso Melgarve TRANSMISSION New Circuit / Network changes Kinlochleven Tummel Fiddes Kincardine 1234 Power Flow MW Fort William Errochty Power Station 1541 575 Errochty Brechen Rannoch Flow Direction 60 Clunie Alyth Tummel Bridge Tealing Dudhope Arbroath Note 1: The power flows shown in this diagram represent the transfers as Lochay Cashlie Lyndhurst Milton of Craigie per the ETYS model exchange which represents a typical winter peak power Taynuilt Killin Charleston Dalmally Finlarig Cruachan Glenagnes Dudhope Inch Cape flow scenario. 1727 Burghmuir 1081 St. Fillans Note 2: The network is intact and no boundary constraints applied. Nant Clachan Inverarnan North Argyll 1400 Cupar Note 3: Geographic drawings of the NETS are to be taken as an approximate Inveraray Sloy Glenrothes Firth of Forth location of assets. 326 Leven 170 Devonside Westfield Redhouse Neart na Gaolthe Note 4: The future reinforcements shown in pink are based on NOA 2019/20. Whistlefield Kincardine Stirling Dunfemline Glenniston Denny Mossmorran Note 5: Connection year for Interconnectors and offshore wind farms are Port Ann Longannet Inverkeithing Helensburgh Bonnybridge Grangemouth Dunbar Innerwick based on Interconnector Register and TEC register contracted dates. Dunoon Spango Cumbernald Telford Rd. Shrubhill Cockenzie Bainsford Gorgie Portobelllo Crystal Rig Torness Valley Strathleven Windyhill 1765 Broxburn Dewar Place Erskine Lambhill Drumcross Sighthill Whitehouse Bathgate Kaimes Devol Easterhouse Currie Fallago 2163 Livingston Smeaton Moor Coatbridge Crossaig Newarthill Branxton Hunterston Neilston Clydes Mill 402 NorthHunterston Strathaven Black Law Extension Dunlaw Extension Berwick East Marshall Meadows 98 Busby Black Law Hunterston Farm East 924 Whitelee Wishaw NSL Hunterston Kilwinning Kilbride Kilmarnock Saltcoats Whitelee ExtnSouth Linnmill Town Eccles To Norway Meadowhead Carradale Kilmarnock Coalburn SP TRANSMISSION LTD Galashiels South Ayr 1283 2205 Clyde (North) Coylton 3153 Clyde (South) Hawick New Cumnock Elvanfoot Maybole Moffat Black Hill Glenglass Auchenwynd Harestanes Hadyard Dunhill Dersalloch Moyle Carsfad 2709 Ewe Hill 327 Dogger Bank Kendoon Blackcraig To Northern Ireland Markhill Blyth Glenlee Gretna Arecleoch Kilgallioch Dumfries Ecclefechan Auchencrosh Fourstones Newton Earlstoun Stewart 159 Tynemouth Chapelcross2774 Harker South Shields Stella West West Boldon Glenluce Tongland Offerton Hawthorn Pit Hartmoor Spennymoor Hartlepool Saltholme Tod Point Teesside Norton Robin Rigg Greystones Grangetown 2200 2587 Lackenby NATIONAL GRID ELECTRICITY TRANSMISSION

1555 Western Hutton HVDC Walney 1696 Extension Link Ormonde

Quernmore Walney I & II Heysham Osbaldwick Knaresborough West of Duddon Sands Middleton Barrow Bradford Thornton 72 Hornsea West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk Fryston3053 Saltend North Hedon Penwortham Drax Humber Gateway 308 Elland Saltend South East West Ferrybridge Eggborough Rochdale To Ireland 1199 Washway Keadby Humber Refinery Farm Kearsley Whitegate Templeborough Thorpe Lister Killingholme Triton Knoll Burbo 767 West Marsh South Drive Rainhill Bank I&II Carrington Stalybridge Melton Humber Grimsby West Gwynt y Mor Kirkby Pitsmoor West Wylfa South Stocksbridge Aldwarke Bank Viking Manchester Winco Bank Burton Birkenhead Bredbury Neepsend Thurcroft Rhyl Flats Fiddlers To Denmark North Hoyle Rocksavage Daines Sheffield City Ferry Brinsworth Cottam Race Bank Dudgeon Flintshire Frodsham Jordanthorpe Bodelwyddan Bridge Norton Lees Pentir Macclesfield Inner Dowsing Capenhurst Chesterfield Lincs High Dinorwig Connah’s Quay 874 Marnham Sheringham Shoal 2289 Staythorpe Lynn Legacy Ffestiniog Cellarhead Stoke Bardolph 822 Bicker Fen 311 Ratcliffe 2185 Willington on Soar Trawsfynydd 1054 2109 1686 Rugeley Drakelow Walpole East Anglia Spalding North Scroby sands Sutton Necton Ironbridge Ryhall Norwich Main Bushbury Bridge Willenhall Shrewsbury Penn Bustleholm Enderby Hams Hall Ocker Hill 2970 Nechells Coventry 2136 Oldbury 1833 Kitwell Berkswell 1471

Burwell Main Sizewell Feckenham Grendon Bishops Wood Eaton Greenlink 1159 Socon 2762 NeuConnect To Ireland Patford Bramford To Germany Bridge 1539 Greater Gabbard 891 Sundon 535 East Claydon Pelham Braintree Wymondley Leighton Buzzard Greater Gabbard 2nd part (Galloper) Rassau 309 Walham Bulls Lodge 1246 Rye House Rhigos Imperial Brimsdown Park Waltham Cross Gunfleet Sands I&II 494 Cowley Highbury 2596 To Netherlands Swansea North Watford Elstree London Array Pembroke Amersham Main Hackney BritNed Cilfynydd Culham Tottenham Redbridge Rayleigh Main Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Willesden Margam Iron Acton Coryton Iver Kensal Green West Ham Whitson Barking Pyle Ealing Pudding St Johns City Rd Mill Tilbury Grain Wood Hurst West Thurrock Thanet Seabank Kentish Flats 1289 Wimbledon New Cross Northfleet Tremorfa Laleham Littlebrook Kingsnorth 656 East Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham Chessington Richborough Beddington Rowdown To Belgium East Bramley West Weybridge 148 986 Fleet Canterbury NEMO 606 North 0.5 Hinkley Point Sellindge West Sellindge Bridgwater Alverdiscott 375 434 Bolney 409 Taunton Nursling 40 541 To France 146 Dungeness Gridlink Marchwood Mannington Chilling Lovedean Ninfield 1178 Axminster 212 Fawley Botley Wood Eleclink Exeter 614 To France To France 55 Chickerell IFA Rampion Langage Abham

Indian Queens Landulph

Aquind To France

To France To France IFA2 FAB Link 6 Figure C5: GB Power Flow Diagram Leading the Way 2029/30

Substation

400kV Substations 275 kV Substations 132kV Substations

To Shetland Circuit 400kV 275kV 290 220kV 132kV Dounreay Thurso South Offshore AC Cable Connagil Spittal 200 Offshore DC Cable Mybster 809 Interconnector (as of September 2020 IC register) Beatrice Cassley Stornoway Dunbeath Gordonbush Strathbrora Offshore Wind Projects 160 Lairg Moray Firth Brora Round 1 Harris Loch Buidhe Shin Caithness Moray HVDC Round 2 Grudie Bridge Mossford Norwegian Fyrish Alness To Norway Round 2.5 Corriemoillie Fraserburgh Luichart Orrin 1100 Elgin Dorenell Macduff St. Fergus Ardmore Keith 143 Deanie 66 Round 3 Culligran Dingwall Strichen Nairn New Deer Aigas Kilmorack Inverness Blackhillock Dunvegan Peterhead Beauly 704 248 Hywind 517 Rothiernorman Scottish Territorial Waters Sites Fasnakyle Knocknagael Dyce Persley Kintore Glen Willowdale Broadford 34.1 Morrison Tomatin Caennacroc Foyers Woodhill Network Information ClayhillsAberdeen Fort Augustus Boat of 1000 Quoich Garten Tarland Craigiebuckler Glendoe Redmoss Uprate / Reconductor Circuit Invergarry SCOTTISH HYDRO-ELECTRIC 2208 Fetteresso Melgarve TRANSMISSION New Circuit / Network changes Kinlochleven Tummel Fiddes 1800 Kincardine 1234 Power Flow MW Fort William Errochty Power Station 700 Errochty Brechen Rannoch Flow Direction 72 Clunie Alyth Tummel Bridge Tealing Dudhope Arbroath Note 1: The power flows shown in this diagram represent the transfers as Lochay Cashlie Lyndhurst Milton of Craigie per the ETYS model exchange which represents a typical winter peak power Taynuilt Killin Charleston Dalmally Finlarig Dudhope flow scenario. Cruachan Burghmuir Glenagnes Inch Cape 2399 1282 St. Fillans Note 2: The network is intact and no boundary constraints applied. Nant Clachan Inverarnan North Argyll 1569 Cupar Note 3: Geographic drawings of the NETS are to be taken as an approximate Inveraray Sloy Glenrothes Firth of Forth location of assets. 346 Leven 172 Devonside Westfield Redhouse Neart na Gaolthe Note 4: The future reinforcements shown in pink are based on NOA 2019/20. Whistlefield Kincardine Stirling Dunfemline Glenniston Denny Mossmorran Note 5: Connection year for Interconnectors and offshore wind farms are Port Ann Longannet Inverkeithing Helensburgh Bonnybridge Grangemouth Dunbar Innerwick based on Interconnector Register and TEC register contracted dates. Dunoon Spango Cumbernald Telford Rd. Shrubhill Cockenzie Bainsford Gorgie Portobelllo Crystal Rig Torness Valley Strathleven Windyhill 2370 Broxburn Dewar Place Erskine Lambhill Drumcross Sighthill Whitehouse Bathgate Kaimes Devol Easterhouse Currie Fallago 286 Livingston Smeaton Moor Coatbridge Crossaig Newarthill Branxton Hunterston Neilston Clydes Mill 411 NorthHunterston Strathaven Black Law Extension Dunlaw Extension Berwick East Marshall Meadows 97 Busby Black Law Hunterston Farm East Whitelee Wishaw 694 NSL Hunterston Kilwinning Kilbride Kilmarnock Saltcoats Whitelee ExtnSouth Linnmill Town Eccles 2000 To Norway Meadowhead Carradale Kilmarnock Coalburn SP TRANSMISSION LTD Galashiels South Elvanfoot Ayr 1146 1656 North Clyde (North) Coylton 1055 Clyde (South) Elvanfoot Hawick New Cumnock Maybole Glenmuckloch Moffat Black Hill Glenglass Auchenwynd Harestanes Hadyard Dunhill Dersalloch Moyle Carsfad 2397 Ewe Hill 344 Dogger Bank Kendoon Blackcraig To Northern Ireland Markhill Blyth Glenlee Gretna Arecleoch Kilgallioch Dumfries Ecclefechan Auchencrosh Fourstones Newton Earlstoun Stewart 44 Tynemouth Chapelcross2495 Harker South Shields Stella West West Boldon Glenluce Tongland Offerton Hawthorn Pit Hartmoor Spennymoor Hartlepool Saltholme Tod Point Teesside Norton Robin Rigg Greystones Grangetown 2200 2486 Lackenby NATIONAL GRID ELECTRICITY TRANSMISSION 1571 Western Hutton HVDC Walney 1764 Extension Link Ormonde

Quernmore Walney I & II Heysham Osbaldwick Knaresborough West of Duddon Sands Middleton Barrow Bradford Thornton 426 Hornsea West Kirkstall Skelton Poppleton Creyke Beck Westermost Rough Stanah Padiham Grange Monk Fryston2335 Saltend North Hedon Penwortham Drax Humber Gateway 488 Elland Saltend South East West Ferrybridge Eggborough 1128 Rochdale To Ireland Washway Keadby Humber Refinery Farm Kearsley Whitegate Templeborough Thorpe Lister Killingholme Triton Knoll Burbo 1398 West Marsh South Drive Rainhill Bank I&II Carrington Stalybridge Melton Humber Grimsby West Gwynt y Mor Kirkby Pitsmoor West Wylfa South Stocksbridge Aldwarke Bank Viking Manchester Winco Bank Burton Birkenhead Bredbury Neepsend Thurcroft Rhyl Flats Fiddlers To Denmark North Hoyle Rocksavage Daines Sheffield City Ferry Brinsworth Cottam Race Bank Dudgeon Flintshire Frodsham Jordanthorpe Bodelwyddan Bridge Norton Lees Pentir Macclesfield Inner Dowsing Capenhurst Chesterfield Lincs High Dinorwig Connah’s Quay 564 Marnham Sheringham Shoal 2443 Staythorpe Lynn Legacy Ffestiniog Cellarhead Stoke Bardolph 1635 Bicker Fen 433 Ratcliffe 2531 Willington on Soar Trawsfynydd 1600 255 Rugeley Drakelow Walpole East Anglia Spalding1614 North Scroby sands Sutton Necton Ironbridge Ryhall Norwich Main Bushbury Bridge Willenhall Shrewsbury Penn Bustleholm Enderby Hams Hall Ocker Hill Nechells Coventry 2554 3146 Oldbury 2196 Kitwell Berkswell 2680

Burwell Main Sizewell Feckenham Grendon Bishops Wood Eaton Greenlink 1565 Socon 2909 NeuConnect To Ireland Patford Bramford To Germany Bridge 1916 Greater Gabbard 1339 Sundon 1205 East Claydon Pelham Braintree Wymondley Leighton Buzzard Greater Gabbard 2nd part (Galloper) Rassau 147 Walham Bulls Lodge 1872 Rye House Rhigos Imperial Brimsdown Park Waltham Cross Gunfleet Sands I&II 460 Cowley Highbury 3459 To Netherlands Swansea North Watford Elstree London Array Pembroke Amersham Main Hackney BritNed Cilfynydd Culham Tottenham Redbridge Rayleigh Main Baglan Bay Mill Hill Warley Upper Boat Uskmouth Minety Didcot Willesden Margam Iron Acton Coryton Iver Kensal Green West Ham Whitson Barking Pyle Ealing Pudding St Johns City Rd Mill Tilbury Grain Wood Hurst West Thurrock Thanet Seabank Kentish Flats Wimbledon New Cross 1847 Northfleet Tremorfa Laleham Littlebrook Kingsnorth 624 East Singlewell Kemsley Cleve Hill Aberthaw Cardiff Melksham Chessington Richborough East West Weybridge Beddington Rowdown To Belgium Bramley 640 1067 Fleet Canterbury NEMO 482 North 752 Hinkley Point Sellindge West Sellindge Bridgwater Alverdiscott 427 1039 Bolney 161 Taunton Nursling 446 161 To France 253 Dungeness Gridlink Marchwood Mannington Chilling Lovedean Ninfield 1339 Axminster 252 Fawley Botley Wood Eleclink Exeter 744 To France

11 Chickerell To France IFA Rampion Langage Abham

Indian Queens Landulph

Aquind To France

To France To France IFA2 FAB Link