Scope
Reference
2025-061
Description
Auditors to be employed to carry out Engineering asset assurance surveys and inspections at gas and electricity sites. The scope of work, for a period would be typically as follows for electricity assets:
* Primary assets (transformers, circuit breakers > 25 years old) at ~ 20 substations supplying strategically important demand (possibly generation), including those designated Critical National Infrastructure (CNI). Estimated Time - 3 months assumed reasonable. Sites to be agreed with National Grid Electricity Transmission (NGET). DESNZ want input to this too.
The auditor would provide their expert view on whether NGET's asset management policies and procedures are fit for purpose and consistent with international best practice. Whether they are following these policies and procedures correctly, in terms of the monitoring, maintenance and repair/replacement of these assets. Whether they are accurately recording these activities and making appropriate/timely interventions where issues are identified. And whether they are reporting accurately to Ofgem through Network Asset Resilience Measures (NARMs).
2. Expanding 1 to cover 30 substations (>10% of all NGET substations as a representative sample), 4-5 months.
3. Expanding 1 to cover a wider set of substation assets (Protection & Control, Connections / Busbars, Civil Structures, Cables, Auxiliary Systems, disconnectors/earth switches etc), ~ 6 months.
4. Expanding 3 to cover 30 substations, say 9 months.
5. Expanding 3 to include 10% of Overhead Lines and Cables (~800km) on heavily loaded strategic transmission boundaries. 1-2 years at a guess.
A similar programme would likely be developed for Gas.
Total value (estimated)
- £4,633,333.33 excluding VAT
- £5,560,000 including VAT
Above the relevant threshold
Contract dates (estimated)
- 2 February 2026 to 1 February 2030
- Possible extension to 1 February 2032
- 6 years
Description of possible extension:
The option to extend for up to x2 12-month periods until 01/02/2032
Main procurement category
Services
CPV classifications
- 79212000 - Auditing services
- 90714000 - Environmental auditing
Contract locations
- UK - United Kingdom
Participation
Particular suitability
Small and medium-sized enterprises (SME)
Submission
Publication date of tender notice (estimated)
4 November 2025
Enquiry deadline
19 November 2025, 12:00pm
Tender submission deadline
26 November 2025, 12:00pm
Submission address and any special instructions
www.mytenders.co.ukTenders and all associated documents required as part of the tender submission must be submitted BEFORE 12noon on the date of tender closing for a supplier's offer to be deemed compliant.
Tenders may be submitted electronically
Yes
Languages that may be used for submission
English
Award decision date (estimated)
14 January 2026
Other information
Payment terms
Invoices must be sent to invoices@ofgem.gov.uk and contain the relevant Con / Spec number (2025-061) and Purchase Order number.
Payment will be made via BACS to the bank details provided by the supplier.
Procedure
Procedure type
Open procedure
Reduced tendering period
Yes
Qualifying planned procurement notice - minimum 10 days
Contracting authority
Ofgem
- Public Procurement Organisation Number: PWXD-5991-LZZP
10 South Colonnade
London
E14 4PU
United Kingdom
Region: UKI42 - Tower Hamlets
Organisation type: Public authority - sub-central government