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OCTARY · GB GRID INFRASTRUCTUREBritain’s electricity grid
The high-voltage transmission network across England, Scotland and Wales, the upgrades planned to 2035, and the projects queuing to connect to it.
Transmission circuits13,877 km551 circuits at 132–400 kV
Substations648226 at 400 kV
Connection queue683.3 GW1,855 projects waiting to connect
Network projects14318 under construction
Grid map
Existing transmission circuits by voltage, new circuits planned to 2035 (dashed), network upgrade projects and the connection queue. Turn layers on and off, and click anything for details.
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Circuits400 kV275 kV132 kVHVDCNew HVACProjectsPlanningConsentedConstructionBuilt
Connection queue by stage
Every project holding a transmission connection agreement with NESO, from early scoping to built.
Waiting to connect, by technology
Capacity still to connect (not yet built).
- Solar + storage560 projects · 219.0 GW
- Battery storage735 projects · 205.0 GW
- Offshore wind107 projects · 113.1 GW
- Interconnector24 projects · 33.3 GW
- Gas21 projects · 31.0 GW
- Onshore wind214 projects · 23.3 GW
- Hydro and pumped storage23 projects · 16.7 GW
- Wind + storage99 projects · 13.1 GW
- Solar44 projects · 12.5 GW
- Nuclear5 projects · 11.0 GW
- Demand (data centres, industry)1 projects · 3.9 GW
- Other22 projects · 1.3 GW
By transmission owner
Which network each project will connect to.
Network upgrade projects
New circuits, substations and upgrades in NESO’s plan for a clean power system by 2030, and the follow-on work to 2035.
| Project | Stage | In service |
|---|---|---|
| Install new MSCs at Burwell Main New network upgrade · HND essential option | Construction | 2022 |
| Carry out thermal upgrading on the existing circuit between Keadby and West Burton Existing network upgrade · HND essential option | Construction | 2024 |
| Reactive compensation protective switching scheme New network upgrade · Proceed | Construction | 2024 |
| Install further voltage support equipment at Pelham Existing network upgrade · Proceed | Construction | 2024 |
| Install voltage support equipment at Pelham Existing network upgrade · Proceed | Construction | 2024 |
| Power control device along Blyth to Tynemouth and Blyth to South Shields New network upgrade · Proceed | Construction | 2024 |
| Reactive compensation protective switching scheme New network upgrade · Proceed | Construction | 2024 |
| Reactive compensation protective switching scheme New network upgrade · Proceed | Construction | 2024 |
| Replace the conductors on the existing circuit between Cottam and Keadby with higher capacity conductors Existing network upgrade · HND essential option | Construction | 2025 |
| Thermal upgrade for Sundon and Wymondley 400 kV substation Existing network upgrade · HND essential option | Construction | 2025 |
| Add power control devices to the existing circuits between Blyth and Tynemouth and Blyth and South Shields Existing network upgrade · Proceed | Construction | 2025 |
| Carry out thermal upgrading on the existing circuit between Bramley and Melksham Existing network upgrade · Hold | Construction | 2026 |
| Denny North 400/275 kV second supergrid transformer New network upgrade · Hold | Construction | 2026 |
| A new 400 kV double circuit between the existing Norton to Osbaldwick circuit and Poppleton and relevant 275 kV upgrades New onshore circuit · HND essential option | Construction | 2027 |
| Replace the conductors on the existing circuit between Bramley and Melksham with higher capacity conductors Existing network upgrade · Hold | Construction | 2027 |
| Upgrade the existing network to a higher voltage at Bridgewater and replace the conductors on the existing circuit to Hinkley with higher capacity conductors Existing network upgrade · Hold | Construction | 2027 |
| New offshore HVDC link between Torness and Hawthorn Pit (Eastern Green Link 1) New offshore circuit · HND essential option | Construction | 2027 |
| Replace the conductors on the existing circuit between Drax and Fenwick Tee with higher capacity conductors Existing network upgrade · HND essential option | Construction | 2030 |
| New offshore HVDC link between Peterhead and Drax (Eastern Green Link 2) New offshore circuit · HND essential option | Planning/consenting | 2029 |
| New circuit between New Deer and Greens (New Deer 2) New onshore circuit · Enabling works | Planning/consenting | 2030 |
| New circuit between Banniskirk (Spittal) and Carnaig (Loch Buidhe) New onshore circuit · HND essential option | Planning/consenting | 2030 |
| New circuit from Kintore to Emmock (Tealing) and upgrade elements of the existing Emmock to Westfield and Alyth to Emmock circuits New onshore circuit · HND essential option | Planning/consenting | 2030 |
| New offshore HVDC link between East Scotland and the East of England (Eastern Green Link 4) New offshore circuit · HND essential option | Planning/consenting | 2030 |
| New offshore circuit between Banniskirk (Spittal) and Longside (Peterhead 2) New offshore circuit · HND essential option | Planning/consenting | 2030 |
| New circuit between Coachford (Blackhillock 2) and Peterhead New onshore circuit · HND essential option | Planning/consenting | 2030 |
| New circuit between Beauly and Coachford (Blackhillock 2) New onshore circuit · HND essential option | Planning/consenting | 2030 |
| Upgrade the existing network to a higher voltage between Beauly and Denny Existing network upgrade · Hold | Planning/consenting | 2030 |
| New offshore HVDC link between Peterhead and the East Coast of England (Eastern Green Link 3) New offshore circuit · HND essential option | Planning/consenting | 2031 |
| New circuit between Carnaig (Loch Buidhe) and Beauly New onshore circuit · HND essential option | Planning/consenting | 2031 |
| Upgrade the circuit between Kincardine to Wishaw, including increasing elements to a higher voltage Existing network upgrade · Proceed | Design/development and consenting | 2026 |
| Replace the conductors on the existing circuit between Strathaven and Smeaton with higher capacity conductors Existing network upgrade · HND essential option | Design/development and consenting | 2027 |
| Build a new substation north of Kincardine and connect this to Denny North New network upgrade · Proceed | Design/development and consenting | 2027 |
| Upgrade the existing network to a higher voltage between Waltham Cross to Hackney Existing network upgrade · HND essential option | Design/development and consenting | 2027 |
| Upgrade the existing network to a higher voltage between Brinsworth and Chesterfield and Chesterfield and High Marnham. Develop new High Marnham and Chesterfield high voltage substations Existing network upgrade · HND essential option | Design/development and consenting | 2028 |
| Upgrade existing circuits and establish a new route between Bonnybridge and Glenmavis Existing network upgrade · Proceed | Design/development and consenting | 2028 |
| New circuit between Bramford and Twinstead New onshore circuit · HND essential option | Design/development and consenting | 2028 |
| Carry out thermal upgrading on the existing circuits between Tilbury to Grain and Tilbury to Kingsnorth Existing network upgrade · Proceed | Design/development and consenting | 2028 |
| Errochty - Clunie 132kV reconductoring. Existing network upgrade · Proceed - Maintain | Design/development and consenting | 2029 |
| Upgrade the existing network between Windyhill, Lambhill and Denny North, including increasing elements to a higher voltage Existing network upgrade · Proceed | Design/development and consenting | 2029 |
| Replace the conductors on the existing circuit between Strathaven and Elvanfoot with higher capacity conductors Existing network upgrade · Proceed - Critical | Design/development and consenting | 2030 |
| Replace the conductors on the existing circuit between West Burton and Ratcliffe-on-Soar with higher capacity conductors Existing network upgrade · HND essential option | Design/development and consenting | 2030 |
| New offshore circuit between Suffolk and Kent New offshore circuit · HND essential option | Design/development and consenting | 2030 |
| Replace the conductors on the existing circuit between Elvanfoot and Harker with higher capacity conductors Existing network upgrade · Proceed - Critical | Design/development and consenting | 2030 |
| New circuit between North Lincolnshire and South Lincolnshire border New onshore circuit · HND essential option | Design/development and consenting | 2030 |
| New circuit between Chesterfield and Ratcliffe-on-Soar New onshore circuit · HND essential option | Design/development and consenting | 2030 |
| New circuit between Creyke Beck and High Marnham New onshore circuit · HND essential option | Design/development and consenting | 2030 |
| New circuit in north East Anglia New onshore circuit · HND essential option | Design/development and consenting | 2030 |
| New circuit in south East Anglia New onshore circuit · HND essential option | Design/development and consenting | 2030 |
| New substation in the South Humber area New network upgrade · HND essential option | Design/development and consenting | 2030 |
| Upgrade and/or rebuild the circuits and equipment between Longside (Peterhead 2), Peterhead, Persley, Kintore, Fetteresso, Alyth, and Kincardine Existing network upgrade · Proceed - Critical | Design/development and consenting | 2033 |
| Establish further connection capacity between Dounreay, Banniskirk (Spittal), and Thurso Existing network upgrade · Enabling works | Design/development and consenting | 2034 |
| Blackhillock - Cairnford - Kintore 400kV upgrade. Existing network upgrade · Proceed - Critical | Design/development and consenting | 2034 |
| Reconductor remainder of Bramford to Braintree to Rayleigh route New network upgrade · HND essential option | Strategic Optioneering | 2023 |
| Elstree to Sundon reconductoring Existing network upgrade · HND essential option | Strategic Optioneering | 2024 |
| Add power control devices to the existing circuit between Keadby and West Burton Existing network upgrade · HND essential option | Strategic Optioneering | 2024 |
| Install voltage support equipment at Rye House Existing network upgrade · Proceed | Strategic Optioneering | 2024 |
| Install further voltage support equipment at Rye House Existing network upgrade · Proceed | Strategic Optioneering | 2024 |
| Bramley to Fleet circuits thermal uprating Existing network upgrade · Hold | Strategic Optioneering | 2025 |
| Power control device along Bramley to Fleet New network upgrade · Hold | Strategic Optioneering | 2025 |
| Add power control devices to the existing circuit between Tilbury and Kingsnorth Existing network upgrade · Hold | Strategic Optioneering | 2026 |
| Increase rating of power control devices installed on the existing circuit between Keadby and West Burton Existing network upgrade · HND essential option | Strategic Optioneering | 2026 |
| Replace the conductors on the existing circuit between Bramley and Fleet with higher capacity conductors Existing network upgrade · Hold | Strategic Optioneering | 2026 |
| Install voltage support equipment within the North East region Existing network upgrade · Hold | Strategic Optioneering | 2026 |
| Spennymoor to Norton circuit thermal uprating Existing network upgrade · Hold | Strategic Optioneering | 2027 |
| Carry out thermal upgrading on the existing circuit between Stella West and Spennymoor Existing network upgrade · Hold | Strategic Optioneering | 2027 |
| Reconductor a short span of the Norton-Osbaldwick 1 400kV circuit Existing network upgrade · HND essential option | Strategic Optioneering | 2027 |
| Install voltage support equipment at Penwortham Existing network upgrade · Hold | Strategic Optioneering | 2027 |
| Power control device along Cottam to West Burton New network upgrade · HND essential option | Strategic Optioneering | 2027 |
| Add power control devices to the existing circuit between Cellarhead and Drakelow Existing network upgrade · HND essential option | Strategic Optioneering | 2027 |
| Increase rating of power control devices installed on the existing circuit between Cellarhead and Drakelow Existing network upgrade · HND essential option | Strategic Optioneering | 2027 |
| Further increase rating of power control devices installed on the existing circuit between Cellarhead and Drakelow Existing network upgrade · HND essential option | Strategic Optioneering | 2027 |
| Carry out thermal upgrading to Bramford and Norwich substations Existing network upgrade · Hold | Strategic Optioneering | 2028 |
| Replace the conductors on the existing circuit between Barking and West Ham with higher capacity conductors Existing network upgrade · Hold | Strategic Optioneering | 2028 |
| Connect the existing circuit between Pelham and Sundon that passes Wymondley substation into the substation Existing network reconfiguration · HND essential option | Strategic Optioneering | 2028 |
| Replace the conductors on the existing circuit between Elstree and Sundon with higher capacity conductors and connect into the Elstree Substation Existing network upgrade · HND essential option | Strategic Optioneering | 2029 |
| New circuit between Elstree and St John’s Wood New onshore circuit · HND essential option | Strategic Optioneering | 2029 |
| Reconductor a short span of the Norton-Osbaldwick 2 400kV circuit Existing network upgrade · HND essential option | Strategic Optioneering | 2030 |
| Carry out thermal upgrading on the existing circuit between Cottam and Market Harborough and Grendon Existing network upgrade · HND essential option | Strategic Optioneering | 2030 |
| Replace the conductors on the existing circuit between Enderby and Patford Bridge and East Claydon with higher capacity conductors Existing network upgrade · HND essential option | Strategic Optioneering | 2030 |
| New circuit between south east Scotland and North West England New onshore circuit · Proceed - Maintain | Strategic Optioneering | 2033 |
| New transmission capacity between the South Lincolnshire, Cambridgeshire and North West Norfolk boundary to Hertfordshire New onshore circuit · Proceed - Critical | Strategic Optioneering | 2034 |
| Harker to Stella West via Fourstones upgrade from 275kV to 400kV, installation of Quadrature Booster Existing network upgrade · Proceed - Critical | Strategic Optioneering | 2035 |
| Carry out thermal upgrading on the existing circuit between Osbaldwick and Thornton Existing network upgrade · Enabling works | Scoping | 2027 |
| Replace the conductors on the existing circuits between Carrington and Daines with higher capacity conductors Existing network upgrade · Enabling works | Scoping | 2027 |
| Carry out thermal upgrading on the existing circuit between Thurcroft and West Melton Existing network upgrade · Proceed - Maintain | Scoping | 2027 |
| Upgrade the existing circuits between Brinsworth and Thorpe Marsh to allow for more capacity Existing network upgrade · Hold | Scoping | 2027 |
| Reconductor the existing 400 kV single circuit which runs from Feckenham to Hams Hall Existing network upgrade · Hold | Scoping | 2027 |
| Installation of series compensation on the existing circuit between East Anglia Coastal Node and Tilbury Existing network upgrade · Proceed - Maintain | Scoping | 2027 |
| Power flow control device along Tealing to Westfield New network upgrade · Hold | Scoping | 2027 |
| New circuit in North Wales with a higher capacity then was previously recommended Refine previous option · Proceed - Critical | Scoping | 2028 |
| Replace the conductors on the existing circuit between Pentir and Trawsfynydd with a higher capacity then was previously recommended Refine previous option · Proceed - Critical | Scoping | 2028 |
| Reconductor the newly formed second Bramford to Braintree to Rayleigh Main circuit Existing network upgrade · HND essential option | Scoping | 2028 |
| New circuit in North Wales with a higher capacity then was previously recommended Refine previous option · HND essential option | Scoping | 2028 |
| Replace the conductors on the existing circuit between Pentir and Trawsfynydd with a higher capacity then was previously recommended Refine previous option · HND essential option | Scoping | 2028 |
| Replace the conductors on the existing circuits between Hawthorn Pit and Norton with higher capacity conductors Existing network upgrade · Enabling works | Scoping | 2029 |
| Reconductor the Hinkley Point to Taunton to Exeter 400kV circuits Existing network upgrade · Proceed - Critical | Scoping | 2029 |
| Reconductor Grendon to Sundon 400kV double circuit Existing network upgrade · Proceed - Critical | Scoping | 2029 |
| Reconductor the Feckenham to Minety 400kV circuit Existing network upgrade · Proceed - Critical | Scoping | 2029 |
| Upgrade the existing circuits between Eggborough and Thorpe Marsh to allow for more capacity Existing network upgrade · Proceed - Critical | Scoping | 2029 |
| Replace the conductors on the existing circuit between Norton and Osbaldwick with higher capacity conductors Existing network upgrade · Proceed - Critical | Scoping | 2029 |
| Replace the conductors on the existing circuit between Spennymoor to Norton with higher capacity conductors Existing network upgrade · Hold | Scoping | 2029 |
| Replace the conductors on the existing circuit between Spennymoor to Stella West with higher capacity conductors Existing network upgrade · Hold | Scoping | 2029 |
| Add power control devices to the existing circuit between Drax and Thornton Existing network upgrade · Enabling works | Scoping | 2030 |
| Replace the conductors on the existing circuit between Feckenham and Walham with higher capacity conductors Existing network upgrade · Enabling works | Scoping | 2030 |
| Power flow control devices along Thorpe Marsh to West Melton 1 275kV circuit Existing network upgrade · Proceed - Critical | Scoping | 2030 |
| Recondutor Carrington - Penwortham & Padiham - Penwortham 400kV circuits Existing network upgrade · Hold | Scoping | 2030 |
| Upgrade the existing circuits between Lackenby and Thornton to allow for more capacity Existing network upgrade · Proceed - Critical | Scoping | 2030 |
| Replace the conductors on the existing circuit between Lackenby and Norton with higher capacity conductors Existing network upgrade · HND essential option | Scoping | 2030 |
| Replace the conductors on the existing circuit between Feckenham and Ironbridge with higher capacity conductors Existing network upgrade · HND essential option | Scoping | 2030 |
| Upgrade the existing Mersey ring of circuits and substations to allow for more capacity (Phase 1 of 2) Existing network upgrade · Hold | Scoping | 2031 |
| Upgrade the existing network to a higher voltage between Clydes Mill and Strathaven Existing network upgrade · Hold | Scoping | 2031 |
| Replace the conductors on the existing circuits between Brinsworth and Thorpe Marsh, Brinsworth and Chesterfield, and Chesterfield and Ratcliffe with higher capacity conductors Existing network upgrade · Hold | Scoping | 2032 |
| Reconfigure Thorpe Marsh substation Existing network reconfiguration · Proceed - Maintain | Scoping | 2032 |
| Reconfigure the network between Keadby and Thorpe Marsh Existing network reconfiguration · Hold | Scoping | 2032 |
| Upgrade the existing Mersey ring of circuits and substations to allow for more capacity (Phase 2 of 2) Existing network upgrade · Hold | Scoping | 2033 |
| Adjust the existing network to form a circuit from Kincardine North towards Strathaven and Smeaton using existing pylon routes Existing network reconfiguration · Hold | Scoping | 2033 |
| Reconfigure Stalybridge - Thorpe Marsh 400kV circuit Existing network upgrade · Proceed - Critical | Scoping | 2033 |
| New circuit between Wymondley and Waltham Cross and increase operating voltage of the network within the area New onshore circuit · Proceed - Maintain | Scoping | 2033 |
| Refine one of the proposed offshore HVDC link planned between Scotland and Eastern England with a third connection into Lincolnshire New offshore circuit · Enabling works | Scoping | 2033 |
| Increase the capacity of the proposed HND1 West Coast offshore HVDC link between Scotland and Wales New offshore circuit · Proceed - Maintain | Scoping | 2036 |
| New circuit within South East England New onshore circuit · Enabling works | Scoping | 2036 |
| New circuit across North West England New onshore circuit · Proceed - Critical | Scoping | 2036 |
| Harburn to Gala North 400kV Double Circuit Addition New onshore circuit · Proceed - Maintain | Scoping | 2036 |
| New circuit between south west Scotland and North West England New onshore circuit · Proceed - Critical | Scoping | 2037 |
| New circuit between North Wales and South Wales New onshore circuit · Proceed - Critical | Scoping | 2037 |
| New circuit from north east Scotland to the Central Belt New onshore circuit · Proceed - Critical | Scoping | 2038 |
| Commercial solution for Scotland and the north of England - stage 2 New network upgrade · Proceed - Critical | Project not started | 2031 |
| Commercial solution for East Anglia - stage 2 New network upgrade · Proceed - Critical | Project not started | 2031 |
| Commercial solution for the north of England - stage 1 New network upgrade · Proceed - Critical | Project not started | 2031 |
| Commercial solution for the north of England - stage 2 New network upgrade · Proceed - Critical | Project not started | 2031 |
| Commercial solution for north of Wales - stage 1 New network upgrade · Hold | Project not started | 2031 |
| Commercial solution for north of Wales - stage 2 New network upgrade · Hold | Project not started | 2031 |
| Commercial solution for Scotland and the north of England - stage 1 New network upgrade · Proceed - Critical | Project not started | 2031 |
| Commercial solution for East Anglia - stage 1 New network upgrade · Proceed - Critical | Project not started | 2031 |
| Reconductor remainder of Rayleigh to Tilbury circuit Existing network upgrade · Proceed | 2022 | |
| Reconductor remainder of Coryton South to Tilbury circuit Existing network upgrade · Proceed | 2022 | |
| Additional power control devices at both Harker and Penwortham New network upgrade · Proceed | 2022 | |
| Harker supergrid transformer 5 and supergrid transformer 9A banking arrangement New network upgrade · Proceed | 2022 | |
| Reconductor Bramford to Norwich double circuit Existing network upgrade · HND essential option | 2023 | |
| Cellarhead to Drakelow circuits thermal uprating Existing network upgrade · Proceed | 2023 | |
| Harker supergrid transformer 6 replacement New network upgrade · Proceed | 2023 | |
| Carry out thermal upgrading of the existing circuits between Creyke Beck, Keadby and Killingholme Existing network upgrade · HND essential option | 2025 | |
| Generator circuit breaker replacement to allow Thornton to run a two-way split New network upgrade · HND essential option | 2025 |
Interconnectors
Cables to other countries’ grids, from the NESO interconnector register.
| Interconnector | Export | Stage |
|---|---|---|
| Aquind Interconnector Aquind Limited | 2.1 GW | Awaiting Consents |
| IFA Interconnector National Grid Interconnectors Limited | 2.0 GW | |
| Alverdiscott Xlinks 1 Ltd | 1.8 GW | Scoping |
| Alverdiscott 2 Xlinks 1 Ltd | 1.8 GW | Scoping |
| Continental Link National Grid Interconnector Holdings Limited | 1.8 GW | Scoping |
| GB-EU MPI Windgrid | 1.8 GW | Scoping |
| Teeside MPI National Grid Interconnector Holdings Limited | 1.8 GW | Scoping |
| The Superconnection Asc Energy plc | 1.8 GW | Scoping |
| LionLink (EuroLink) National Grid Interconnector Holdings Limited | 1.6 GW | Scoping |
| Celtic MPI National Grid Interconnector Holdings Limited | 1.5 GW | Scoping |
| Gridlink Interconnector Gridlink Interconnector Limited | 1.5 GW | Scoping |
| Nautilus National Grid Interconnector Holdings Limited | 1.5 GW | Scoping |
| Viking Link Denmark Interconnector National Grid Viking Link Limited | 1.5 GW | |
| Western MPI National Grid Interconnector Holdings Limited | 1.5 GW | Scoping |
| NS Link National Grid North Sea Link Limited | 1.5 GW | |
| NeuConnect Interconnector Neuconnect Britain Ltd | 1.5 GW | Under Construction/Commissioning |
| Cronos Cronos Energy Ltd | 1.4 GW | Scoping |
| Low Carbon Link Low Carbon Solar Park 39 Limited | 1.4 GW | Scoping |
| NorthConnect Northconnect Limited | 1.4 GW | Scoping |
| Tarchon Tarchon Energy Limited | 1.4 GW | Scoping |
| FAB Link Interconnector FAB Link Limited | 1.3 GW | Awaiting Consents |
| Seneca Frontier Power International Limited | 1.3 GW | Scoping |
| Britned Britned Development Limited | 1.2 GW | |
| IFA2 Interconnector National Grid Ifa 2 Limited | 1.2 GW | |
| ElecLink Eleclink Limited | 1.1 GW | |
| Project Cobalt Getlink Projects 2 Limited | 1.1 GW | Scoping |
| Nemo Link Nemo Link Limited | 1.0 GW | |
| The Superconnection Asc Energy plc | 1.0 GW | Scoping |
| Mares Maresconnect Limited | 750 MW | Awaiting Consents |
| Kulizumboo Interconnector Kulizumboo Limited | 700 MW | Scoping |
| LIRIC Interconnector TI LIRIC Limited | 700 MW | Scoping |
| East West Interconnector Eirgrid Interconnector Designated Activity Company | 585 MW | |
| Greenlink Greenlink Interconnector Limited | 524 MW | |
| Auchencrosh (interconnector CCT) Moyle Interconnector Limited | 500 MW | |
| Isle of Man Interconnector Manx Utilities | 74 MW |
More on the grid
Live gridGeneration mix, demand and carbon intensity right now.
Grid capacityHeadroom at Grid Supply Points for new connections.
Cables and grid projectsMajor links, HVDC cables and interconnector projects in detail.
UK power stationsEvery power station on the map, with capacity and status.
US gridTransmission lines and interconnection queues across the United States.
Sources: NESO Transmission Entry Capacity (TEC) register and interconnector register (downloaded 8 November 2026); NESO Clean Power 2030 network map (existing and planned circuits, substations and network projects); National Grid Electricity Transmission overhead line routes. Contains data from NESO, licensed under the NESO Open Data Licence, and National Grid open data. Projects are placed at their connection substation, not the generating site; projects at new, unnamed “connection nodes” are listed but not mapped.