Hydro and pumped storage projects in the connection queue

Every generator, battery and interconnector with an agreement to connect to the GB transmission network, from early scoping to built. Filter by technology, stage or network, and open a project for its connection details.

Projects shown5922.9 GW in total

In planning14scoping or awaiting consent

Consented or building9closest to connecting

Built36connected and operating

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Source: NESO TEC and interconnector registers, downloaded 8 November 2026. Map points are the connection substation, not the project site.

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Connection queue Existing circuits Major grid projects

Voltage400 kV275 kV132 kVHVDCNew HVAC

ProjectsPlanningConsentedConstructionBuiltMajor project with its own page

Projects

59 projects · page 1 of 2

Project	Capacity	Stage	Connection site	From
Pembroke Power Station Hydro and pumped storage · RWE Generation UK Plc	2.2 GW	Built	Pembroke 400kV Substation National Grid (England & Wales)
Earba PSH Hydro and pumped storage · Earba Limited	1.8 GW	Consents Approved	Earba PSH Powerhouse Substation SSEN Transmission (north Scotland)	Oct 2035
Glen Earrach PSH Hydro and pumped storage · Glen Earrach Energy Limited	1.8 GW	Scoping	Glen Earrach PSH 400kV substation SSEN Transmission (north Scotland)	Oct 2035
Dinorwig Hydro and pumped storage · First Hydro Company	1.6 GW	Built	Dinorwig 400kV Substation National Grid (England & Wales)
Fearna PSH 2 Hydro and pumped storage · Fearna Psh Limited	1.5 GW	Awaiting Consents	Fearna Pump Storage Hydro 2 400/15kV Substation SSEN Transmission (north Scotland)	Nov 2036
Ferrybridge D Hydro and pumped storage · Keadby Generation Limited	1.4 GW	Awaiting Consents	Ferrybridge C 275kV Substation National Grid (England & Wales)	Jun 2034
Coire Glas Pumped Storage Hydro and pumped storage · Coire Glas Hydro Pumped Storage Limited	1.3 GW	Scoping	Coire Glas GSP SSEN Transmission (north Scotland)	Oct 2029
Ferrybridge D Hydro and pumped storage · Keadby Generation Limited	1.2 GW	Scoping	Ferrybridge C 275kV Substation National Grid (England & Wales)	Oct 2030
Market Harborough Green Energy Hub Hydro and pumped storage · Telis Energy UK Limited	1.0 GW	Scoping	West Anglia Connection Node F 400kV Substation National Grid (England & Wales)	Oct 2034
Balliemeanoch PSH Hydro and pumped storage · ILI (Borders PSH) Ltd	900 MW	Scoping	Balliemeanoch 275kV Substation SSEN Transmission (north Scotland)	Oct 2034
Loch Kemp PSH Hydro and pumped storage · Loch Kemp Storage Limited	660 MW	Scoping	Loch Kemp 275kV Switching Station SSEN Transmission (north Scotland)	Oct 2030
Coire Glas Pumped Storage Hydro and pumped storage · Coire Glas Hydro Pumped Storage Limited	612 MW	Consents Approved	Coire Glas GSP SSEN Transmission (north Scotland)	Oct 2029
Cruachan Expansion Hydro and pumped storage · Drax Cruachan Expansion Limited	600 MW	Scoping	Cruachan 275kV Substation SP Transmission (south Scotland)	Oct 2030
Earba PSH Hydro and pumped storage · Earba Limited	600 MW	Consents Approved	Earba PSH Powerhouse Substation SSEN Transmission (north Scotland)	Dec 2032
Loch na Cathrach Pumped Storage Hydro Hydro and pumped storage · Statkraft Highlands Psh Limited	550 MW	Consents Approved	Knocknagael 275kV SSEN Transmission (north Scotland)	Oct 2030
Cambridgeshire Energy Storage Centre Hydro and pumped storage · Hydrostor UK Ltd	500 MW	Scoping	South Anglia Connection Node D 400kV Substation National Grid (England & Wales)	Oct 2037
Longhaven Energy Storage Centre Hydro and pumped storage · Hydrostor UK Ltd	500 MW	Scoping	New North East Substation 400kV Substation SSEN Transmission (north Scotland)	Oct 2037
Cruachan U3&4 Replacement Hydro and pumped storage · Drax Pumped Storage Limited	480 MW	Consents Approved	Cruachan 275kV Substation SP Transmission (south Scotland)	Apr 2029
Loch na Cathrach Pumped Storage Hydro Hydro and pumped storage · Statkraft Highlands Psh Limited	450 MW	Consents Approved	Knocknagael 275kV SSEN Transmission (north Scotland)	Apr 2029
Cruachan U3&4 Replacement Hydro and pumped storage · Drax Pumped Storage Limited	440 MW	Built	Cruachan 275kV Substation SP Transmission (south Scotland)
Ffestiniog Hydro and pumped storage · First Hydro Company	360 MW	Built	Ffestiniog 275kV Substation National Grid (England & Wales)
Foyers Hydro and pumped storage · Sse Generation Limited	300 MW	Built	Foyers 275kV Substation SSEN Transmission (north Scotland)
Loch Fearna Pumped Storage Hydro and pumped storage · Fearna Psh Limited	300 MW	Awaiting Consents	Loch Fearna Pumped Storage 400/18kV Substation SSEN Transmission (north Scotland)	Oct 2032
Whitelee Extension Hydro and pumped storage · Scottish Power Renewables (UK) Limited	238 MW	Built	Whitelee Extension 275/33kV SP Transmission (south Scotland)	Dec 2026
Glenmuckloch Pumped Storage Hydro and pumped storage · Glenmuckloch Pumped Storage Hydro Limited	210 MW	Consents Approved	Glenmuckloch 132kV Substation SP Transmission (south Scotland)	May 2029
Muaitheabhal Wind Farm Hydro and pumped storage · Uisenis Power Limited	189 MW	Consents Approved	Muaitheabhal 132/33kV Substation SSEN Transmission (north Scotland)	Dec 2030
Glendoe Hydro and pumped storage · Sse Generation Limited	100 MW	Built	Fort Augustus GSP SSEN Transmission (north Scotland)
Sloy G2 and G3 Hydro and pumped storage · Sse Generation Limited	80 MW	Built	Sloy GSP SSEN Transmission (north Scotland)
Errochty Hydro and pumped storage · Sse Generation Limited	75 MW	Built	Errochty 132kV Substation SSEN Transmission (north Scotland)
Sloy G1 and G4 Hydro and pumped storage · Sse Generation Limited	73 MW	Built	Sloy GSP SSEN Transmission (north Scotland)
Clunie (part of the Clunie Cascade) Hydro and pumped storage · Sse Generation Limited	61 MW	Built	Clunie GSP SSEN Transmission (north Scotland)
Lochay (Part of Killin Cascade Hydro Scheme) Hydro and pumped storage · Sse Generation Limited	51 MW	Under Construction/Commissioning	Lochay 132/11kV Substation SSEN Transmission (north Scotland)	Jan 2027
Cwm Rheidol Hydro and pumped storage · Statkraft Energy Ltd.	50 MW	Built	Cwm Rheidol National Grid (England & Wales)
Fasnakyle G1 & G2 Hydro and pumped storage · Sse Generation Limited	46 MW	Built	Fasnakyle GSP SSEN Transmission (north Scotland)
Lochay (Part of Killin Cascade Hydro Scheme) Hydro and pumped storage · Sse Generation Limited	45 MW	Built	Lochay 132/11kV Substation SSEN Transmission (north Scotland)
Glenmoriston (part of the Moriston Cascade) Hydro and pumped storage · Sse Generation Limited	40 MW	Built	Glenmoriston GSP SSEN Transmission (north Scotland)
Dolgarrog Hydro and pumped storage · RWE Generation UK Plc	39 MW	Built	Pentir GSP National Grid (England & Wales)
Deanie (part of the Beauly Cascade) Hydro and pumped storage · Sse Generation Limited	38 MW	Built	Deanie GSP SSEN Transmission (north Scotland)
Finlarig Hydro and pumped storage · Sse Generation Limited	35 MW	Scoping	Killin 132/11kV Substation SSEN Transmission (north Scotland)	Nov 2031
Luichart (part of the Conon Cascade) Hydro and pumped storage · Sse Generation Limited	34 MW	Built	Luichart GSP SSEN Transmission (north Scotland)
Fasnakyle G3 & G4 Hydro and pumped storage · Sse Generation Limited	31 MW	Built	Fasnakyle GSP SSEN Transmission (north Scotland)
Maentwrog Hydro and pumped storage · Nuclear Decommissioning Authority	30 MW	Built	Maentwrog GSP National Grid (England & Wales)
Aigas (part of the Beauly Cascade) Hydro and pumped storage · Sse Generation Limited	20 MW	Built	Aigas Hydro 132kV Substation SSEN Transmission (north Scotland)
Ceannacroc (part of the Moriston Cascade) Hydro and pumped storage · Sse Generation Limited	20 MW	Built	Ceannacroc GSP SSEN Transmission (north Scotland)
Invergarry (part of the Garry Cascade) Hydro and pumped storage · Sse Generation Limited	20 MW	Built	Invergarry 132kV Substation SSEN Transmission (north Scotland)
Kilmorack (part of the Beauly Cascade) Hydro and pumped storage · Sse Generation Limited	20 MW	Built	Kilmorack GSP SSEN Transmission (north Scotland)
Culligran (part of the Beauly Cascade) Hydro and pumped storage · Sse Generation Limited	19 MW	Built	Culligran GSP SSEN Transmission (north Scotland)
Mossford (part of the Conon Cascade) Hydro and pumped storage · Sse Generation Limited	19 MW	Built	Mossford GSP SSEN Transmission (north Scotland)
Livishie (part of the Moriston Cascade) Hydro and pumped storage · Sse Generation Limited	18 MW	Built	Glenmoriston GSP SSEN Transmission (north Scotland)
Orrin (part of the Conon Cascade) Hydro and pumped storage · Sse Generation Limited	18 MW	Built	Orrin GSP SSEN Transmission (north Scotland)

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.