Hornsea 2 OFTO

Offshore GridOperationalGB1,320 MW220 kV545 km

Basic Information

Also known as:Hornsea Two OFTO, Hornsea Project Two OFTO, Hornsea Project Two Offshore Transmission, HOW02 OFTO, Diamond Transmission Partners Hornsea Two, DTPHT, TR8 Hornsea Two OFTO

Status:Operational

Capacity:1,320 MW

Transmission Model:Developer Build & Transfer

Owners:

HICL Infrastructure(37.5%)

KKR & Co (KKR)(37.5%)

BlackRock(25%)

Project Company:

Diamond Transmission Partners Hornsea Two Limited

Type:offshore grid

Expected Life:24 years

Website:www.diamondtransmissionpartners.com

Description:

Hornsea Two OFTO is the high-voltage HVAC transmission link that connects the Hornsea Project Two offshore wind farm to Great Britain’s onshore transmission network. The connection comprises a single offshore AC substation (OSP), an offshore reactive compensation station (RCS), and three 220 kV export cable circuits which make landfall at...

Supply Chain (0)

Project Timeline (0)

No lifecycle events recorded yet.

Route

	Southern North Sea	North Sea	North Lincolnshire
Landfall	N/A	N/A	—
Grid Connection	—	—	Killingholme 400 kV substation

Southern North Sea

Landfall:N/A

Grid:—

North Sea

Landfall:N/A

Grid:—

North Lincolnshire

Landfall:—

Grid:Killingholme 400 kV substation

Financial

£1,140M€1,405.7M adj.€1.95k/MW-km

www.ofgem.gov.uk (Jul 2023)

CAPEX:£1,140M

Adjusted to 2025¹:€1,405.7M

Cost Intensity¹:€1.95k per MW-km

Estimate Date:Jul 2023

Source:www.ofgem.gov.uk

Notes:

OFTO Final Transfer Value (transfer/transaction value for Hornsea Two OFTO). Financial close/asset transfer reported 21 July 2023; Ofgem reports final transfer value £1.14bn.

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

Cable Specifications

Offshore Platform – RCS Interlink 1

1 × 220 kV HVAC · 440 MVA · 84 km

System:1 × 220 kV HVAC

Power rating:440 MVA

Route length:84 km(84 subsea)

Burial depth:

Sources do not provide a single numeric burial-depth target for the inter-platform (offshore-to-offshore) cables. The project documentation and the OFTO decommissioning plan state that some offshore export cable sections are...

Offshore Platform – RCS Interlink 2

1 × 220 kV HVAC · 62 km

System:1 × 220 kV HVAC

Route length:62 km(62 subsea)

Offshore Platform – RCS Interlink 3

3 × 220 kV HVAC · 84 km

System:3 × 220 kV HVAC

Route length:84 km(84 subsea · 0 land)

RCS – Killingholme Export Cable 1

Horseshoe Point, Lincolnshire, United Kingdom

1 × 220 kV HVAC · 440 MVA · 105 km

System:1 × 220 kV HVAC

Power rating:440 MVA

Route length:105 km(66 subsea · 39 land)

RCS – Killingholme Export Cable 2

Horseshoe Point, Lincolnshire, United Kingdom

1 × 220 kV HVAC · 105 km

System:1 × 220 kV HVAC

Route length:105 km(66 subsea · 39 land)

Burial depth:

No explicit nominal or target burial depth for the RCS→Killingholme export cable segment is stated in the developer, OFTO or regulatory documents reviewed. Project documents (developer / Diamond Transmission Partners)...

RCS – Killingholme Export Cable 3

Horseshoe Point, Lincolnshire, United Kingdom

1 × 220 kV HVAC · 105 km

System:1 × 220 kV HVAC

Route length:105 km(66 subsea · 39 land)

Burial depth:

Burial depth varies along the RCS-to-Killingholme export route. Ofgem / project documentation describes the export link as comprising an offshore subsea section (c.66 km from the reactive compensation station to...

Stations

Offshore Platform (GB)

Hornsea Two (southern North Sea), United Kingdom

1320 MW 220 kV · offshore

Rating:1320 MW · 220 kV

Location:offshore

Type:HVAC Collector Station

Reactive Compensation Station (GB)

Hornsea Two Reactive Compensation Station (RCS) — Southern North Sea (offshore, part of Hornsea Two), United Kingdom

220 kV · offshore

Rating:220 kV

Location:offshore

Type:Reactive Compensation

Killingholme 400 kV substation

Killingholme (North Killingholme), North Lincolnshire, United Kingdom

1320 MW 400 kV · onshore

Rating:1320 MW · 400 kV

Location:onshore

Type:HVAC Collector Station