Seagreen OFTO

Offshore GridOperationalGB1,075 MW220 kV84 km

Basic Information

Also known as:Seagreen Phase 1 OFTO, Seagreen Offshore Electricity Transmission (OFTO) Phase 1, Seagreen Phase 1 OFTO Project Limited, TR9 Seagreen OFTO

Status:Operational

Capacity:1,075 MW

Transmission Model:Developer Build & Transfer

Owners:

Equitix Investment Management Limited

Kyuden International Corporation

Kyushu Electric Power Transmission and Distribution Company, Incorporated

Project Company:

Seagreen Phase 1 OFTO Project Limited

Type:offshore grid

Expected Life:24 years

Website:sgofto.co.uk

Description:

Seagreen Phase 1 OFTO is the offshore transmission link that exports electricity from the Seagreen Phase 1 offshore wind farm (circa 1,075 MW) to the onshore GB transmission network in Angus, Scotland. The transmission system is an HVAC design operating at 220 kV and comprises a single offshore substation platform,...

Supply Chain (0)

Project Timeline (0)

No lifecycle events recorded yet.

Route

	North Sea	North Sea (Firth of Forth)	Angus
Landfall	N/A	N/A	—
Grid Connection	—	—	Tealing Substation (Scottish and Southern Electricity Networks - SSEN)

North Sea

Landfall:N/A

Grid:—

North Sea (Firth of Forth)

Landfall:N/A

Grid:—

Angus

Landfall:—

Grid:Tealing Substation (Scottish and Southern Electricity Networks - SSEN)

Financial

£621.2M€710.9M adj.€7.87k/MW-km

www.ofgem.gov.uk (Mar 2025)

CAPEX:£621.2M

Adjusted to 2025¹:€710.9M

Cost Intensity¹:€7.87k per MW-km

Estimate Date:Mar 2025

Source:www.ofgem.gov.uk

Notes:

Ofgem final assessed costs / Final Transfer Value used to set FTV for the Seagreen Phase 1 OFTO (transfer of transmission assets); corroborated by industry press reporting of a circa...

¹ Cost inflated in local currency then converted to euros (where applicable).

Cable Specifications

Seagreen export cable system (3 x 220 kV export circuits)

Carnoustie, Angus, United Kingdom

3 × 220 kV HVAC · 1075 MVA · 84 km

System:3 × 220 kV HVAC

Power rating:1075 MVA

Route length:84 km(64 subsea · 20 land)

OSP interconnection cable(s)

220 kV HVAC

System:220 kV HVAC

Collector Stations

Offshore Platform (GB 1)

Seagreen Phase 1 Offshore Wind Farm (offshore substation platform) — North Sea, ~27 km off Angus, United Kingdom

1075 MW 220 kV · offshore

Rating:1075 MW · 220 kV

Location:offshore

Offshore Platform (GB 2)

Seagreen Offshore Substation Platform (Seagreen Phase 1, North Sea / Firth of Forth), United Kingdom

1075 MW 220 kV · offshore

Rating:1075 MW · 220 kV

Location:offshore

Tealing Substation

Tealing Substation, United Kingdom

1075 MW 220 kV · onshore

Rating:1075 MW · 220 kV

Location:onshore