National Grid Electricity Transmission Plc is seeking experienced and suitably qualified suppliers capable of delivering a fully integrated security solution for critical national infrastructure sites at Walham and Pentir. The requirement is divided into two separate Lots: Lot 1 (Walham) and Lot 2 (Pentir). Suppliers may submit tenders for one or both Lots; however, no supplier will be awarded more than one Lot. Further details in relation to the scope are set out in the Instructions to Tenderers.

National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified supplier capable of delivering a fully integrated security solution for a critical national infrastructure site at Walham. Options: The Contract is based on the NEC4 ECC form of contract, which includes the right for the Project Manager to issue instructions to the Contractor which may have the impact of changing Key Dates/Completion Dates/the total of the Prices. Not all such instructions constitute modifications within the meaning set out in the Procurement Act 2023, but National Grid note the following Project Manager's instructions which may, depending on their content, give rise to modifications under the Procurement Act 2023 are permitted modifications (para 11 Schedule 8): • A Project Manager's instruction changing the Scope/ or the boundaries of the Site (clause 14.3, 60.1(1)); • A Project Manager's instruction to omit any part(s) of the Scope (clause Z23). The Client may also in accordance with ECI clause X22 i) issue a notice to proceed instructing the Contractor to complete Stage 2 of the works or b) issue an instruction that a notice to proceed to Stage 2 will not be issued and that the contract will terminate/ Stage 2 of the works will be removed from the Scope. This procurement is for the appointment of a contractor under NEC4 Engineering and Construction Contract Option C with Secondary Option X22 Early Contractor Involvement. The successful Contractor will initially be appointed to undertake Stage One ECI activities including design development, buildability assessments, risk reduction, programme optimisation and preparation of an open-book Target Cost. Following completion of Stage One the Client will determine whether to issue a notice to proceed for Stage Two construction activities. Progression to Stage Two is subject to agreement of the Target Cost, satisfactory risk reduction outcomes, business case approval and funding confirmation. If a notice that the works will not proceed to Stage Two is issued, the contract will terminate/Stage Two of the works will be removed from the Scope.

National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified supplier capable of delivering a fully integrated security solution for a critical national infrastructure site at Pentir. Options: The Contract is based on the NEC4 ECC form of contract, which includes the right for the Project Manager to issue instructions to the Contractor which may have the impact of changing Key Dates/Completion Dates/the total of the Prices. Not all such instructions constitute modifications within the meaning set out in the Procurement Act 2023, but National Grid note the following Project Manager's instructions which may, depending on their content, give rise to modifications under the Procurement Act 2023 are permitted modifications (para 11 Schedule 8): • A Project Manager's instruction changing the Scope/ or the boundaries of the Site (clause 14.3, 60.1(1)); • A Project Manager's instruction to omit any part(s) of the Scope (clause Z23). The Client may also in accordance with ECI clause X22 i) issue a notice to proceed instructing the Contractor to complete Stage 2 of the works or b) issue an instruction that a notice to proceed to Stage 2 will not be issued and that the contract will terminate/ Stage 2 of the works will be removed from the Scope. This procurement is for the appointment of a contractor under NEC4 Engineering and Construction Contract Option C with Secondary Option X22 Early Contractor Involvement. The successful Contractor will initially be appointed to undertake Stage One ECI activities including design development, buildability assessments, risk reduction, programme optimisation and preparation of an open-book Target Cost. Following completion of Stage One the Client will determine whether to issue a notice to proceed for Stage Two construction activities. Progression to Stage Two is subject to agreement of the Target Cost, satisfactory risk reduction outcomes, business case approval and funding confirmation. If a notice that the works will not proceed to Stage Two is issued, the contract will terminate/Stage Two of the works will be removed from the Scope.

Procurement Act 2023

Competitive flexible procedure

Utilities

Suppliers wishing to participate in this opportunity should complete the Expression of Interest link. Suppliers are requested to register their interest 16th October 2026 to enable Ariba onboarding and secure access to the documents. Registration is an administrative access step and is not an evaluated stage. Suppliers that miss this date should contact National Grid promptly. Access may be facilitated where reasonably practicable before the submission deadline. National Grid Procurement will issue the tender documents via SAP Ariba (https://service.ariba.com) to those suppliers that have expressed their interest in response to this notice.

Please complete the Microsoft Form to submit an Expression of Interest to receive tender notice documentation. The information collected will be used as part of the first-stage SAP Ariba onboarding process for National Grid. All fields are mandatory to facilitate Supplier Lifecycle and Performance (SLP) pre-registration and should be completed accurately and in full. Following receipt of expressions of interest, an Ariba profile will be created and a questionnaire issued via Ariba to conclude onboarding. In addition, your organisation must be registered on the Central Digital Platform (CDP). If you have not yet registered, please do so using the following link: https://supplierregistration.cabinetoffice.gov.uk/login: https://forms.cloud.microsoft/r/3cr4ANRWaJ