--- title: "Supply Chain Notice: WAT0149-01 B Lock Penstock Replacements- Portsmouth Naval Base" ocid: "ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c" markdown_url: "https://d3tenders.com/contract/ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c.md" json_url: "https://d3tenders.com/contract/ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c.json" source: "Contracts Finder" current_stage: "Tender" buyer: "MINISTRY OF DEFENCE" published: "2026-05-27" --- # Supply Chain Notice: WAT0149-01 B Lock Penstock Replacements- Portsmouth Naval Base Buyer: MINISTRY OF DEFENCE Current stage: Tender OCID: ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c) [Download OCDS JSON](https://d3tenders.com/contract/ocds-b5fd17-112178fc-2c4a-44be-8b03-ec22c183718c.json) ## Summary This procurement process, initiated by the Ministry of Defence, focuses on the project titled "Supply Chain Notice: WAT0149-01 B Lock Penstock Replacements- Portsmouth Naval Base". This tender falls under the industry category of penstock valves and is located at the Portsmouth Naval Base in the South East region of the United Kingdom. Currently at the tender stage, key dates include the closing of expressions of interest on 18th June 2026, with the project expected to commence in December 2026 and complete by February 2030. The procurement method utilised is a restricted procedure, specifying a selective approach for engaging suppliers, with an estimated contract value of £3,500,000. The tender is specifically aimed at SME suitability, providing opportunities for smaller enterprises to engage in substantial infrastructural projects within a secure military environment. This tender represents a significant business growth opportunity for companies experienced in marine environment projects, particularly those capable of demonstrating proficiency in the design, manufacture, and installation of penstock replacements. With the project demanding adherence to complex logistical and security requirements, businesses with at least five years of relevant marine experience will be well-positioned to compete. Companies specialising in infrastructure and possessing robust health and safety compliance are encouraged to express interest. The partnership between KBR and BAE Systems through KBS Maritime highlights the potential for collaboration with major industry players, offering a prestigious project for businesses aiming to enhance their portfolio in public defence infrastructure contracts. ## Notice The Tenderer should be aware that the works detailed in this package are constrained due to the nature of the location they are to be conducted in. Project location- HM Naval Base Portsmouth The Contractor shall be expected to adhere by the HMNB site security requirements, all Contractors and Sub-Contractors shall be BPSS security vetted and will be required to hold the relevant site security passes. The Contractor shall be expected to hold the following levels of insurance PS10m Public Liability, PS10m Product Liability, PS5m Professional Indemnity. KBS Maritime - Introduction KBS Maritime is a joint venture between KBR and BAE Systems, bringing together two global players with a rich heritage of delivering excellence, innovation and reliability. The joint venture will combine the expertise of KBR as a global leader in infrastructure asset management and services with BAE Systems' experience and capability within Portsmouth Naval Base. KBS Maritime are delivering an ambitious, modern and enduring change to the Portsmouth Naval base infrastructure, securing investment in the local community and ensuring fit-for-purpose, world-leading fleet support for the Royal Navy and the UK in the decades ahead. Project Background KBS Maritime has a requirement for penstock replacements at B Lock within Portsmouth Naval Base. The project consists of 10 in number replacement penstocks in 6 chambers overall. The penstock system controls sea water via a culvert system between the harbour, the basin and the dry docks. These include levelling penstocks of circa 8 metres deep to drainage penstocks circa 18 metres deep. The replacement programme will replace the current cast irons doors with new with specification to be agreed along with the associated shafts, wedges, door nut, brackets, platforms, ladders and actuation and road plates. This project is due to commence in Q4 2026 with all to be replaced by Feb 2030. Contractors must be able to demonstrate design, manufacture and installation of penstock replacements in a marine environment including all site management under CDM regulations and competency of Health and Safety compliance and safe practices. Contractors must also possess at least five years' experience working within a marine environment. Contractors who do not provide suitable and sufficient evidence of this will not be considered. Key Dates (approximate) - Expressions of Interest close: 18/06/2026 - Bidders Selected: by end of June 2026 - ITT Published: early July 2026 - ITT Close: early September 2026 - Project commencement: December 2026 - Project Completion Feb 2030 ## Key Details | Field | Value | | --- | --- | | Publication source | Contracts Finder | | Latest notice | https://www.contractsfinder.service.gov.uk/Notice/194a8516-37fa-4d45-8bc5-bf2a03252d40 | | Notice type | Tender Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Selective | | Procurement method details | Restricted procedure (above threshold) | | Tender suitability | SME | | Awardee scale | Not specified | | All stages | Tender | ## Dates | Field | Value | | --- | --- | | Publication date | 27 May 2026 | | Submission deadline | 18 Jun 2026 | | Future notice date | Not specified | | Award date | Not specified | | Contract period | 1 Dec 2026 - 28 Feb 2030 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | £3,500,000 | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Active | | Lots status | Not specified | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | MINISTRY OF DEFENCE | | Locality | PORTSMOUTH | | Post town | Portsmouth | | Postcode | PO1 3NH | | Country | England | | ITL 1 | TLJ South East (England) | | ITL 2 | TLJ3 Hampshire and Isle of Wight | | ITL 3 | TLJ31 Portsmouth | | Local authority | Portsmouth | | Electoral ward | Charles Dickens | | Westminster constituency | Portsmouth South | | Delivery location | TLJ South East (England) | ## CPV Codes ### Divisions - 42 - Industrial machinery ### Codes - 42131220 - Penstock valves ## Release History - 27 May 2026 at 08:02 - Tender - Tender Notice - https://www.contractsfinder.service.gov.uk/Notice/194a8516-37fa-4d45-8bc5-bf2a03252d40 ## Documents - https://www.contractsfinder.service.gov.uk/Notice/194a8516-37fa-4d45-8bc5-bf2a03252d40 27th May 2026 - Opportunity notice on Contracts Finder - https://uk.eu-supply.com/ctm/supplier/publictenders?B=KBS If you are interested in this opportunity, please express an interest through KBS' tendering portal to access the Selection Questionnaire and NDA; - https://www.contractsfinder.service.gov.uk/notice/b761e5b8-1c74-4a82-a2c9-ed1d0436af5f?origin=SearchResults&p=1 External ID of linked Contracts Finder notice: ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. 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