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2025-122 OFTO Cost Assessment Advisors

Published 2 Oct 2026
2 Oct 2026


Reference: 2025-122
Ofgem is looking to procure the necessary Cost Assessment advisors for the Offshore Transmission Owners (OFTO) team to continue its regulatory duties. Provision of these services will be crucial and without this, Ofgem will be unable to run effective tender processes for the upcoming tender rounds. Ofgem are required to run a tender exercise for all offshore transmission projects that qualify under the Tender Regulations 2015. Provision of Cost Assessment consultancy support services will be crucial to ensure that a robust tender process takes place for upcoming tender rounds and without this, Ofgem will be unable to run an effective tender process. To facilitate a robust tender evaluation process, Ofgem requires the services of a supplier on various aspects of the tender and transaction process - evaluation of bidder submissions, and financial assessment required to bring the project to close/appoint an OFTO. Ofgem are required to undertake a cost assessment review of the OFTO assets for those projects that will be the subject of the tender process. This review is fundamental in determining the cost of building the transmission assets to ensure that those costs stated by the developer fairly reflect what will be transferred and that consumers are receive value for money. With this being the case, data submitted by the project developer must be carefully evaluated to ensure that assets are being transferred in the most economic and efficient manner possible.

Full CPV breakdown

  • 66171000 — Financial consultancy services (primary)

Notice details

Buyer type
Local authority
Competition
Open competition (any supplier can bid)
Contract type
Services
Winning supplier
Large company
Procurement method
Open procedure
Main category
Services
Legal basis
UKPGA 2023/54
Notice status
Complete
Award status
Active
Covered by GPA
Yes
Language
EN
Published
02 Oct 2026 10:29
OCID
ocds-h6vhtk-0689c7
Notice ID
2025-122

Organisations on this notice

Grant Thornton UK Advisory & Tax LLP
Supplier Large
8 Finsbury Circus, London, EC2M 7EA, United Kingdom
GB-PPON PPLQ-5161-PCVN

Everything the publisher included in this notice, organised by section.

Organisations

Party 1 › Name Ofgem
Party 1 › Address › Street 10 South Colonnade
Party 1 › Address › Town / city London
Party 1 › Address › Postcode E14 4PU
Party 1 › Address › Country GB
Party 1 › Address › Country United Kingdom
Party 1 › Address › Region (NUTS) UKI42
Party 1 › Contact › Email Procurement2@ofgem.gov.uk
Party 1 › Role buyer
Party 1 › Link http://www.ofgem.gov.uk
Party 1 › Classification › Description Public authority - sub-central government
Party 2 › Name Grant Thornton UK Advisory & Tax LLP
Party 2 › Address › Street 8 Finsbury Circus
Party 2 › Address › Town / city London
Party 2 › Address › Postcode EC2M 7EA
Party 2 › Address › Country GB
Party 2 › Address › Country United Kingdom
Party 2 › Address › Region (NUTS) UKI31
Party 2 › Contact › Email publicsector.bids@uk.gt.com
Party 2 › Role supplier
Party 2 › Business size large
Party 2 › VCSEs No
Party 2 › Public service mission organisation No
Party 2 › Sheltered workshop No

Buyer

Name Ofgem

Tender

Title 2025-122 OFTO Cost Assessment Advisors
Status complete
Procedure type open
Procedure Open procedure
Covered by GPA
Lot › Status complete
Document › Document type Conflict of interest
Document › Description Not published

Awards

Status active
Category services
Supplier › Name Grant Thornton UK Advisory & Tax LLP
Item › CPV › CPV 1 › Description Financial consultancy services
Item › CPV › CPV 2 › Description Onshore and offshore services
Item › CPV › CPV 3 › Description Financial management consultancy services
Item › Delivery › Region (NUTS) UK
Item › Delivery › Country GB
Item › Delivery › Country United Kingdom

Contracts

Title 2025-122 OFTO Cost Assessment Advisors
Status active
Contract period › Start 16 Sep 2026
Contract period › End 9 Sep 2030
Value › Value incl. VAT £2,000,000
Value › Value £1,666,667
Value › Currency GBP
Above threshold Yes
Signed 16 Sep 2026
Document › Document type Contract notice
Document › Description Contract details notice on Find a Tender
Document › Link https://www.find-tender.service.gov.uk/Notice/093175-2026
Document › Published 2 Oct 2026
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