Tender Round 6

Offshore Transmission Owner (OFTO) Tender Round Six (TR6) started in October 2018. TR6 will enable bidders to compete to own the transmission assets of three offshore wind farm projects with an approximate total generation capacity of 2.5GW.

Each transmission system is being constructed by the offshore wind farm developer and will include offshore substation platform(s), offshore and onshore AC export cables, and an onshore substation.

We will administer the tender process for each project, which will result in the appointment of an OFTO to own and operate each transmission system.


  • 588MW capacity
  • Jointly owned by SSE Renewables (40%), Copenhagen Infrastructure Partners (35%) and SDIC Power (25%)
  • Located approximately 13.5km off the Caithness coastline in Northern Scotland

Hornsea 1

  • 1.2GW capacity
  • 100% owned by Ørsted
  • Located in the English North Sea, approximately 120km east of Humber Estuary in East Yorkshire

East Anglia 1

  • 714MW capacity
  • 100% owned by ScottishPower Renewables (UK) Limited
  • Located in the Southern North Sea, approximately 48km off the coast of Suffolk

TR6 information event

On Tuesday 9 October 2018, Ofgem held an information event in London related to TR6 where project developers were able to highlight the investment opportunity presented by each qualified project. To find out more about what was discussed please view the Ofgem presentations from the event. Please see the Attendee list for tender round six information event publication for more information about this event.

Publications and updates

  • Published: 12th Apr 2019
  • Open letters and correspondence
  • 0 Associated documents
Ofgem has announced shortlists of bidders competing to own and operate transmission links to Beatrice, Hornsea Project One and East Anglia ONE windfarms.

  • Published: 4th Feb 2019
  • Charts and data
  • 1 Associated documents
Attendee list for those present at tender round six information event, Tuesday 9 October 2018.

  • Published: 30th Nov 2018
  • Guidance
  • 2 Associated documents
This document sets out the generic Offshore Transmission Owner (OFTO) Licence and guidance for TR6.

  • Published: 30th Nov 2018
  • Guidance
  • 1 Associated documents
This document sets out the next steps for bidders who wish to participate in the TR6 EPQ Stage.

  • Published: 30th Nov 2018
  • Guidance
  • 1 Associated documents
This document sets out the Tender Process Guidance, which bidders must follow in order to participate in TR6.

  • Published: 30th Nov 2018
  • Guidance
  • 3 Associated documents
This Enhanced Pre-Qualification Document sets out the requirements bidders need to demonstrate in order to be invited to participate in the Invitation to Tender Stage for TR6.

  • Published: 30th Nov 2018
  • Guidance
  • 1 Associated documents
This generic Preliminary Information Memorandum outlines an opportunity for investors to acquire electricity transmission assets under the regulatory regime.

  • Published: 18th Oct 2018
  • Agendas, minutes and presentations
  • 5 Associated documents
See the presentations from our tender round six information event.