Galloper OFTO

Offshore GridOperationalGB353 MW132 kV45.85 km

Basic Information

Also known as:Galloper offshore transmission system, Diamond Transmission Partners Galloper OFTO, Diamond Transmission Partners Galloper Limited, DTPG, Galloper TR5 OFTO

Status:Operational

Capacity:353 MW

Transmission Model:Developer Build & Transfer

Owners:

DTUK BLK Bidco Holdings Limited (ultimate controller: BlackRock)(51%)

HICL Infrastructure(49%)

Project Company:

Diamond Transmission Partners Galloper Limited

Type:offshore grid

Expected Life:20 years

Website:www.diamondtransmissionpartners.com

Description:

Galloper OFTO is the dedicated high-voltage transmission link that connects the Galloper Offshore Wind Farm to Great Britain’s onshore transmission network. The HVAC 132 kV connection provides the grid interface for the 353 MW Galloper wind farm via a single offshore substation platform and two independent export cable circuits. Each...

Supply Chain (0)

Project Timeline (0)

No lifecycle events recorded yet.

Route

	Outer Thames Estuary	Suffolk
Landfall	N/A	Sizewell, Suffolk, United Kingdom
Grid Connection	—	Leiston 132kV substation

Outer Thames Estuary

Landfall:N/A

Grid:—

Suffolk

Landfall:Sizewell, Suffolk, United Kingdom

Grid:Leiston 132kV substation

Financial

£281.8M€416.1M adj.€25.71k/MW-km

www.ofgem.gov.uk (Feb 2020)

CAPEX:£281.8M

Adjusted to 2025¹:€416.1M

Cost Intensity¹:€25.71k per MW-km

Estimate Date:Feb 2020

Source:www.ofgem.gov.uk

Notes:

OFTO transfer value / assessed transfer value for the Galloper transmission assets; sale to Diamond Transmission Partners agreed 25 Feb 2020. (Developer initial estimate was higher at £329.1m prior to...

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

Cable Specifications

OSP–Onshore Substation (OSS) export cable route

Sizewell, Suffolk, United Kingdom

1 × 132 kV HVAC · aluminium 1000 mm² · 45.85 km

System:1 × 132 kV HVAC

Construction:aluminium · 1000 mm²

Route length:45.85 km(45 subsea · 0.85 land)

Burial depth:

The two export circuits are described in project and regulatory documents as buried on the subsea route and buried onshore to the onshore substation. Sources describe the route geology as...

Fibre optic:

Each export cable circuit includes integrated fibre optics; project documentation and the developer’s PIM state each export circuit carries 76 fibres. These fibres are provided with the export cables for...

Collector Stations

Offshore Substation Platform (OSP)

Galloper Offshore Wind Farm (Outer Thames Estuary), United Kingdom

353 MW 132 kV · offshore

Rating:353 MW · 132 kV

Location:offshore

Leiston 132kV substation

Leiston, Suffolk, UK, United Kingdom

353 MW 132 kV · onshore

Rating:353 MW · 132 kV

Location:onshore