--- title: "ISS Works at Walham and Pentir" ocid: "ocds-h6vhtk-06e5ea" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06e5ea" markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-06e5ea.md" json_url: "https://d3tenders.com/contract/ocds-h6vhtk-06e5ea.json" source: "Find A Tender Service" current_stage: "Planning" buyer: "NATIONAL GRID ELECTRICITY TRANSMISSION PLC" published: "2026-08-17" --- # ISS Works at Walham and Pentir Buyer: NATIONAL GRID ELECTRICITY TRANSMISSION PLC Current stage: Planning OCID: ocds-h6vhtk-06e5ea [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06e5ea) [Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-06e5ea.json) ## Summary National Grid Electricity Transmission PLC intends to procure fully integrated security solutions for critical national infrastructure sites at Walham in Gloucestershire and Pentir in Gwynedd. The works cover the design and design support, supply and installation of closed-circuit television, surveillance and security systems, fire and burglar alarms, telecommunications equipment, fencing, gates, railings and related safety equipment. The scope also includes engineering and construction works associated with substations. The procurement is divided between the Walham site and the Pentir site, with the same broad security and infrastructure requirements applying to each. Delivery is across the United Kingdom, specifically at these two National Grid electricity transmission locations. This is a works requirement for suppliers able to provide an integrated rather than a single-product security installation. This procurement is at the planning stage: National Grid has stated its intention to buy, but has not issued an invitation to tender. It expects to use a selective, above-threshold competitive flexible procedure for utilities. The buyer expects expressions of interest by 7 October 2026 at 17:00, followed by an award decision expected by 28 January 2027. The buyer expects both contracts to run from 26 February 2027 to 25 February 2028. There are two planned lots: ISS Walham and ISS Pentir, and suppliers may need to consider them separately. The buyer expects the next notice on 28 September 2026. The procedure features are to be advised, and submissions are expected in English. Expressions of interest will support initial supplier onboarding and receipt of tender documentation. The work is likely to suit established security integrators, electrical and telecommunications contractors, engineering and construction firms, and specialist suppliers able to combine these disciplines. Strong candidates will have experience designing, installing and commissioning integrated surveillance, access and perimeter-security solutions, including CCTV, alarms, gates, fencing and safety equipment. Experience working on substations, electricity transmission assets or other critical national infrastructure should be relevant, as the sites require security solutions suitable for nationally important operational facilities. Suppliers should be prepared to demonstrate appropriate technical competence, delivery capacity and experience coordinating design, construction, communications and security systems across separate locations. National Grid says it is seeking experienced and suitably qualified suppliers. Early preparation should include completing supplier onboarding information accurately and ensuring the organisation is registered on the Central Digital Platform. ## Notice National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified suppliers capable of delivering a fully integrated security solution for critical national infrastructure sites at Walham and Pentir. ### Lot Information ISS Walham, Gloucestershire 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. ISS Pentir, Gwynedd 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. ## Key Details | Field | Value | | --- | --- | | Publication source | Find A Tender Service | | Latest notice | https://www.find-tender.service.gov.uk/Notice/078250-2026 | | Notice type | UK3 - Planned Procurement Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Selective | | Procurement method details | Competitive flexible procedure | | Tender suitability | Not specified | | Awardee scale | Not specified | | All stages | Planning | ## Dates | Field | Value | | --- | --- | | Publication date | 17 Aug 2026 | | Submission deadline | Not specified | | Future notice date | 28 Sep 2026 | | Award date | Not specified | | Contract period | 26 Feb 2027 - 25 Feb 2028 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | Not specified | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Planned | | Lots status | Planned | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | NATIONAL GRID ELECTRICITY TRANSMISSION PLC | | Locality | LONDON | | Postcode area | Central London | | Postcode | WC2N 5EH | | Country | England | | ITL 1 | TLI London | | ITL 2 | TLI3 Inner London - West | | ITL 3 | TLI35 Westminster and City of London | | Local authority | Westminster | | Electoral ward | St James's | | Westminster constituency | Cities of London and Westminster | | Delivery location | Not specified | ## CPV Codes ### Divisions - 32 - Radio, television, communication, telecommunication and related equipment - 34 - Transport equipment and auxiliary products to transportation - 35 - Security, fire-fighting, police and defence equipment - 44 - Construction structures and materials; auxiliary products to construction (except electric apparatus) - 45 - Construction work - 79 - Business services: law, marketing, consulting, recruitment, printing and security ### Codes - 32235000 - Closed-circuit surveillance system - 34928200 - Fences - 35120000 - Surveillance and security systems and devices - 44221300 - Gates - 45220000 - Engineering works and construction works - 45232220 - Substation construction work - 45312100 - Fire-alarm system installation work - 45312200 - Burglar-alarm system installation work - 45314000 - Installation of telecommunications equipment - 45340000 - Fencing, railing and safety equipment installation work - 79415200 - Design consultancy services - 79933000 - Design support services ## Release History - 17 Aug 2026 at 16:19 - Planning - UK3 - Planned Procurement Notice - https://www.find-tender.service.gov.uk/Notice/078250-2026 ## Documents - https://www.find-tender.service.gov.uk/Notice/078250-2026 17th August 2026 - Planned procurement notice on Find a Tender - https://forms.cloud.microsoft/r/3cr4ANRWaJ 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. 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 ## Notice URLs - https://supplierregistration.cabinetoffice.gov.uk/login - https://www.legislation.gov.uk/ukpga/2023/54/contents ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-06e5ea. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-06e5ea.json.