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J5 Super Grid Transformer Refurbishment

UK Atomic Energy Authority

This public procurement record has 1 release in its history.

Planning

13 Aug 2026 at 14:01

UK2 - Preliminary Market Engagement Notice
Summary of the contracting process

The UK Atomic Energy Authority is planning works to refurbish three Super Grid Transformers, SGT1A, SGT1B and SGT1C, located north of the J5 Substation. The requirement covers strategic asset life extension, including addressing latent defects and obsolescence during the 2026–2027 shutdown. The transformers are critical assets integrated into the 400kV National Grid network and normally operate in parallel to provide grid stability and redundancy. The intended outcome is to maintain their reliability and operational integrity for a further projected 10 to 15 years. The procurement is categorised as works, with associated transformer repair and maintenance, refurbishment, and mechanical and electrical engineering services. Delivery is identified within the United Kingdom.

This procurement is at the planning stage: UKAEA has stated an intention to procure, but has not yet issued an invitation to tender. It is undertaking cost and scope development alongside preliminary market engagement, including a planned site visit on 26 August 2026 at 09:00; further visits may be arranged. The buyer expected the next notice to be published on 4 September 2026. The estimated value is £700,000 excluding VAT, or £840,000 including VAT. The planned contract period is 9 October 2026 to 1 January 2027. The requirement is presented as a single lot, currently in planning, and is indicated as suitable for small and medium-sized enterprises. The data does not set out an award procedure or evaluation criteria.

The planned work is likely to suit suppliers specialising in high-voltage transformer refurbishment, electrical and mechanical engineering, asset life extension, and maintenance of critical power infrastructure. Relevant businesses would need to understand the inspection, repair and modernisation of ageing transformer assets, including the management of latent defects and obsolete components. Experience working on equipment connected to a 400kV transmission network, maintaining operational reliability and supporting redundancy arrangements, would be commercially relevant. The shutdown-based programme may suit contractors able to plan and deliver concentrated engineering and refurbishment activities within a defined outage window. UKAEA has expressly indicated that small and medium-sized enterprises may be suitable, so capable specialist firms should consider preparing evidence of comparable transformer, substation or high-voltage engineering experience before the tender exercise is released.

How relevant is this notice?

Notice Information

Notice Title

J5 Super Grid Transformer Refurbishment

Notice Description

J5 Super Grid Transformer Refurbishment The United Kingdom Atomic Energy Authority would like to invite suppliers who are interested in this requirement to attend a scheduled site visit, prior to a tender exercise being released for the above requirement. Values listed below are an estimate, and the UKAEA are currently undertaking cost exercises alongside this notice, in order to build upon our current estimates and scope development prior to conducting a tender exercise. Interested parties should contact us via the below link in order to arrange attendance at our site visit. Please use the attached site visit request form and return to us via the EU Supply link below. Scheduled Dates: - Wednesday 26th August, 9:00am Further dates are available on request, as well as further visits to be arranged during the tender period. Outline Scope of Requirement: This project concerns the strategic life-cycle management of Super Grid Transformers SGT1A, SGT1B, and SGT1C, located north of the J5 Substation. These critical assets are currently integrated into the 400kV National Grid network and primarily operate in a parallel configuration to ensure grid stability and redundancy. As these assets approach their fifth decade of service, this project represents a shift from reactive maintenance to a formal Asset Life Extension (ALE) Program. By addressing latent defects and obsolescence during the 2026-2027 shutdown, this scope of work aims to "reset" the aging clock of the SGTs, ensuring their continued reliability and operational integrity for a projected further 10 to 15-year life cycle.

Planning Information

https://uk.eu-supply.com/app/rfq/rwlentrance_s.asp?PID=108182&TID=100113249&B=

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-06e3ab
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/077272-2026
Current Stage
Planning
All Stages
Planning

Procurement Classification

Notice Type
UK2 - Preliminary Market Engagement Notice
Procurement Type
Standard
Procurement Category
Works
Procurement Method
Not Specified
Procurement Method Details
Not specified
Tender Suitability
SME
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

45 - Construction work

50 - Repair and maintenance services

71 - Architectural, construction, engineering and inspection services

CPV Codes

45453100 - Refurbishment work

50532200 - Repair and maintenance services of transformers

71334000 - Mechanical and electrical engineering services

Notice Value(s)

Tender Value
£700,000 £500K-£1M
Lots Value
Not specified
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
13 Aug 20261 weeks ago
Submission Deadline
Not specified
Future Notice Date
4 Sep 20262 weeks to go
Award Date
Not specified
Contract Period
9 Oct 2026 - 1 Jan 2027 1-6 months
Recurrence
Not specified

Notice Status

Tender Status
Planning
Lots Status
Planning
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
UK Atomic Energy Authority
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
OXFORDSHIRE
Postcode
OX14 3DB
Postcode Area
Oxford
Country
England
Major Region (ITL 1)
TLJ South East (England)
Basic Region (ITL 2)
TLJ1 Berkshire, Buckinghamshire and Oxfordshire
Small Region (ITL 3)
TLJ14 Oxfordshire CC
Delivery Location
Not specified
Local Authority
South Oxfordshire
Electoral Ward
Sandford & the Wittenhams
Westminster Constituency
Didcot and Wantage

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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The Open Contracting Data Standard (OCDS) is a framework designed to increase transparency and access to public procurement data in the public sector. It is widely used by governments and organisations worldwide to report on procurement processes and contracts.

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