Gwynt y Mor OFTO

Offshore GridOperational576 MW132 kV124 km

Basic Information

Also known as:Gwynt y Môr OFTO plc, Gwynt y Mor OFTO plc, GYM OFTO, Gwynt y Mor offshore transmission, Gwynt y Mor OFTO TR2

Status:Operational

Capacity:576 MW

Transmission Model:Developer Build & Transfer

Owners:

Balfour Beatty(60%)

Equitix(40%)

Project Company:

Gwynt y Môr OFTO plc

Type:offshore grid

Expected Life:20 years

Website:www.gymofto.co.uk

Description:

Gwynt y Môr OFTO is the offshore transmission owner (OFTO) connection that transmits power from the 576 MW Gwynt y Môr offshore wind farm in the Irish Sea to the onshore GB transmission network. The HVAC transmission system uses 132 kV technology and comprises two offshore substation platforms feeding four...

Supply Chain (0)

Project Timeline (0)

No lifecycle events recorded yet.

Route

	North Wales	Liverpool Bay (Irish Sea)	North Wales
Landfall	N/A	N/A	—
Grid Connection	Bodelwyddan / St Asaph onshore substation (National Grid 400 kV)	—	St Asaph (Bodelwyddan) 400 kV substation

North Wales

Landfall:N/A

Grid:Bodelwyddan / St Asaph onshore substation (National Grid 400 kV)

Liverpool Bay (Irish Sea)

Landfall:N/A

Grid:—

North Wales

Landfall:—

Grid:St Asaph (Bodelwyddan) 400 kV substation

Cable Specifications

Export Cable 1 (Gwynt y Môr – Bodelwyddan)

Bodelwyddan, Denbighshire, United Kingdom

1 × 132 kV HVAC · 31 km

System:1 × 132 kV HVAC

Route length:31 km(20 subsea · 11 land)

Burial depth:

Route-specific burial varies by location and includes nearshore HDD ducts and dredged shore approaches; the site is known for a high tidal range and shallow waters near the landfall which...

Fibre optic:

Project documentation and the developer's PIM note that the export circuits include fibres for communications and temperature monitoring built into the export/onshore cable system. No fibre-pair or fibre-count (e.g., 24/48/96)...

Export Cable 2 (Gwynt y Môr – Bodelwyddan)

1 × 132 kV HVAC · 31 km

System:1 × 132 kV HVAC

Route length:31 km(20 subsea · 11 land)

Burial depth:

Nearshore and onshore sections are installed and protected using typical shore-approach techniques: the repair/installation scope described for the site includes pulling the new cable ashore through a horizontal directional drill...

Fibre optic:

Developer documents and technical material state the export/onshore cables include fibres for communications and temperature monitoring; the project PIM and related developer material reference 'circuits and fibres for communications and...

Export Cable 3 (Offshore Platform GB 2 – Bodelwyddan)

1 × 132 kV HVAC · 31 km

System:1 × 132 kV HVAC

Route length:31 km(20 subsea · 11 land)

Burial depth:

Shore approach and onshore transition are engineered to be buried where feasible: the landfall works include horizontal directional drilling (HDD) under a railway, dredging of the shore approach and subsequent...

Fibre optic:

The export cable construction includes fibre for communications and temperature monitoring and at least one spare FOC (spare fibre optic core) within the cable assembly. Regulatory and technical documents reference...

Export Cable 4 (Offshore Platform GB 2 – Bodelwyddan)

Bodelwyddan, Denbighshire, United Kingdom

1 × 132 kV HVAC · 31 km

System:1 × 132 kV HVAC

Route length:31 km(20 subsea · 11 land)

Burial depth:

Burial varies along the route; the project documentation and later repair scopes describe subsea export cables routed to a landfall with nearshore shallow waters and a high tidal range that...

Fibre optic:

Project documents indicate the export/onshore cable arrangements include fibres for communications and temperature monitoring (the scheme description lists export circuits and fibres for communications/temperature monitoring). The sources do not specify...