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SF6 Leak Repair Framework

NATIONAL GRID ELECTRICITY TRANSMISSION PLC

This public procurement record has 1 release in its history.

Planning

07 Sep 2026 at 13:45

UK3 - Planned Procurement Notice
Summary of the contracting process

National Grid Electricity Transmission plc plans to establish a framework for SF6 leak repair, leak reduction and preventative treatment services across its Gas Insulated Switchgear and Gas Insulated Busbar assets at transmission substations throughout Great Britain. The work is an engineering and electrical equipment maintenance service, covering the design, installation, testing, inspection and quality assurance of external, non-intrusive repair solutions. Interventions may include permanent repairs, leak-rate reduction treatments and preventative measures, typically without taking equipment out of service where reasonably practicable. The purpose is to reduce or prevent SF6 emissions while maintaining asset integrity and operational performance across National Grid’s electricity transmission network. The framework is classified under electrical equipment repair, installation and mechanical and electrical engineering services.

This procurement is at the planning stage: National Grid has announced its intention to procure, but has not yet issued an invitation to tender. It expects to use a selective competitive flexible procedure to establish a closed framework with up to six participants. The estimated value is £7.5 million excluding VAT, or £9 million including VAT. The buyer expects to publish the tender notice on 18 November 2026 and asks interested suppliers to submit expressions of interest by 25 November 2026. The expected award decision date is 10 May 2027, with the framework planned to start on 31 May 2027. The initial term is three years, with two possible one-year extensions by mutual agreement, giving a maximum end date of 31 May 2032. Competition may be reopened for some requirements.

This will suit contractors with national coverage and the ability to work across Great Britain’s electricity transmission substations. Relevant businesses will need practical expertise in SF6 leak detection, repair, emissions reduction and preventative treatment on GIS and GIB assets, together with electrical and mechanical engineering capability. The buyer is looking for technically robust, evidence-based repair methods that can be designed, installed, tested, inspected and quality-assured without disrupting equipment operation where practicable. Contractors are expected to operate under an ISO 9001-compliant quality management system and to undertake the roles of Principal Contractor and Principal Designer under the Construction (Design and Management) Regulations 2015. Suppliers should prepare evidence of national reach, regulatory compliance, asset-integrity management and safe delivery in operational transmission environments before the tender is issued.

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Notice Information

Notice Title

SF6 Leak Repair Framework

Notice Description

National Grid Electricity Transmission (NGET) intends to establish a framework for the provision of Sulphur Hexafluoride (SF6) leak repair, leak reduction and preventative treatment services across its portfolio of Gas Insulated Switchgear (GIS) and Gas Insulated Busbar (GIB) assets located at transmission substations throughout Great Britain. The framework is intended to increase the delivery of SF6 emissions reduction activities through the use of standardised contracting arrangements and approved repair methodologies. Appointed contractors will be responsible for the design, installation, testing, inspection and quality assurance of external, non-intrusive repair solutions that maintain asset integrity and operational performance while reducing or preventing SF6 leakage. Solutions may include permanent repairs, leak-rate reduction treatments, and preventative interventions, and will typically be required to be installed without taking equipment out of service where reasonably practicable. Contractors will be expected to provide technically robust, evidence-based solutions, operate under ISO 9001-compliant quality management systems, and fulfil the roles of Principal Contractor and Principal Designer under the Construction (Design and Management) Regulations 2015. The framework will enable NGET to respond efficiently to emerging SF6 emission reduction requirements across its transmission network. The anticipated term of the framework will be a 3-year initial term with 2 year extension options upon mutual agreement.

Lot Information

Lot 1

Renewal: Extension options are +1 year, +1 year. In place through mutual agreement.

Notice Details

Publication & Lifecycle

Open Contracting ID
ocds-h6vhtk-06f388
Publication Source
Find A Tender Service
Latest Notice
https://www.find-tender.service.gov.uk/Notice/084427-2026
Current Stage
Planning
All Stages
Planning

Procurement Classification

Notice Type
UK3 - Planned Procurement Notice
Procurement Type
Framework
Procurement Category
Services
Procurement Method
Selective
Procurement Method Details
Competitive flexible procedure
Tender Suitability
Not specified
Awardee Scale
Not specified

Common Procurement Vocabulary (CPV)

CPV Divisions

50 - Repair and maintenance services

51 - Installation services (except software)

65 - Public utilities

71 - Architectural, construction, engineering and inspection services

CPV Codes

50532400 - Repair and maintenance services of electrical distribution equipment

50710000 - Repair and maintenance services of electrical and mechanical building installations

51110000 - Installation services of electrical equipment

65300000 - Electricity distribution and related services

71334000 - Mechanical and electrical engineering services

Notice Value(s)

Tender Value
£7,500,000 £1M-£10M
Lots Value
£7,500,000 £1M-£10M
Awards Value
Not specified
Contracts Value
Not specified

Notice Dates

Publication Date
7 Sep 20261 weeks ago
Submission Deadline
Not specified
Future Notice Date
18 Nov 20263 months to go
Award Date
Not specified
Contract Period
31 May 2027 - 31 May 2030 3-4 years
Recurrence
2030-05-18

Notice Status

Tender Status
Planned
Lots Status
Planned
Awards Status
Not Specified
Contracts Status
Not Specified

Buyer & Supplier

Contracting Authority (Buyer)

Main Buyer
NATIONAL GRID ELECTRICITY TRANSMISSION PLC
Contact Name
Available with D3 Tenders Premium →
Contact Email
Available with D3 Tenders Premium →
Contact Phone
Available with D3 Tenders Premium →

Buyer Location

Locality
LONDON
Postcode
WC2N 5EH
Postcode Area
Central London
Country
England
Major Region (ITL 1)
TLI London
Basic Region (ITL 2)
TLI3 Inner London - West
Small Region (ITL 3)
TLI35 Westminster and City of London
Delivery Location
Not specified
Local Authority
Westminster
Electoral Ward
St James's
Westminster Constituency
Cities of London and Westminster

Further Information

Notice Documents

Open Contracting Data Standard (OCDS)

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