--- title: "South East Strategic Reservoir Option (SESRO) Preliminary Market Engagement 2025" ocid: "ocds-h6vhtk-04cdb7" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-04cdb7" markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-04cdb7.md" json_url: "https://d3tenders.com/contract/ocds-h6vhtk-04cdb7.json" source: "Find A Tender Service" current_stage: "Planning" buyer: "THAMES WATER UTILITIES LIMITED" published: "2025-01-07" --- # South East Strategic Reservoir Option (SESRO) Preliminary Market Engagement 2025 Buyer: THAMES WATER UTILITIES LIMITED Current stage: Planning OCID: ocds-h6vhtk-04cdb7 [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-04cdb7) [Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-04cdb7.json) ## Summary Thames Water Utilities Limited, based in Reading, UK, has initiated a preliminary market engagement process for the South East Strategic Reservoir Option (SESRO) project. This procurement falls under the "Construction work" industry category, focusing on infrastructure to manage water resources effectively. The project is currently in the planning stage, with market engagement activities scheduled for 17th March 2025 in central London. The procurement method involves works, and Thames Water invites contractors and investors to express their interest through a registration link provided in the notice. The key focus is to gather interest and insights from market participants to refine procurement approaches and contract terms for a new storage reservoir in the Upper Thames catchment area, with an expected completion and operational date by 2040. This tender provides a significant opportunity for businesses involved in construction, engineering, and financial services to partake in a large-scale infrastructure project aimed at ensuring long-term water resource resilience. The project includes opportunities for an Infrastructure Provider to design, build, and finance major project components, as well as for a Main Works Contractor to undertake construction and commissioning tasks. Businesses specialising in tunnelling, earthmoving, water distribution, and related services, along with those offering engineering, architectural, and financial services, are well-suited to compete and potentially secure lucrative contracts. This engagement offers a platform to influence project delivery while aligning with market trends and benefiting from collaboration with Thames Water and associated stakeholders. ## Notice As part of Thames Water's ongoing programme of preliminary market engagement for the South East Strategic Reservoir Option (SESRO) project, this notice is intended to inform interested parties about upcoming engagement opportunities and to encourage them to register their interest to participate. Please note that this is not a call for competition. Contractors and investors are invited to express their interest in participating in a series of engagement activities including a spring market engagement event scheduled for 17th March 2025, to be held at a central London venue. The engagement will help develop a wider understanding of the delivery of the project from both a construction and investment perspective by showcasing two large scale future opportunities: Infrastructure Provider (IP): The IP will be responsible for taking forward the design, building, and financing the majority of assets within the SESRO project. Main Works Contractor (MWC): To construct and commission the assets under a target price contract, working initially with TW and then the IP once the IP contract is awarded. This engagement presents an opportunity for Thames Water to collaborate with the market in refining its procurement approach and contracting terms. Additionally, it aims to encourage cross-party discussions that align the project's development with market trends, taking into account the perspectives of both MWCs and investors. To access the link to register your interest in market engagement for SESRO, please refer to Section VI.3 Additional Information. ### Lot Information Lot 1 Meeting the water resource supply-demand balance to ensure resilient supplies during droughts is becoming ever more challenging with increasing pressures from climate change, population growth, societal expectations and increasing environmental aspirations. In response, OFWAT has established RAPID comprising the three water industry regulators: Ofwat, the Environment Agency and Drinking Water Inspectorate - to support and oversee the development of SROs in order to secure long-term drought resilience on behalf of customers while protecting the environment and benefiting wider society. The South East Strategic Reservoir Option (SESRO) is a new storage reservoir which would be sited in the Upper Thames catchment, south-west of Abingdon in Oxfordshire. SESRO is envisaged as a regional asset and is being developed by Thames Water on behalf of three water companies - Thames Water, Affinity Water and Southern Water. The reservoir would be filled with water pumped from the River Thames during periods of high river flow. When river levels drop, or demand for water increases, water would be released under gravity back into the River Thames, for re-abstraction downstream. The reservoir would help to protect supplies and manage future water quality issues created by a changing climate as well as offering regional and local benefits, including environmental and biodiversity improvements and public access and recreation. The project involves construction of the new bunded reservoir with a capacity of up to 150Mm3 and a surface area of approximately 7km2. The reservoir is needed to be operational by 2040. To read more about the SESRO project, please visit the following link: https://thames-wrmp.co.uk/projects/sesro/ Additional information: The CPV codes set out in this PIN are included to give an indication of the likely scope of works and services. TWUL does not guarantee that all the activities referenced by the CPV codes will form part of any future tender notice(s), nor is the list exhaustive of all activities which may be included in any procurement process under this project. ## Key Details | Field | Value | | --- | --- | | Publication source | Find A Tender Service | | Latest notice | https://www.find-tender.service.gov.uk/Notice/000261-2025 | | Notice type | Planning Notice | | Procurement type | Standard | | Procurement category | Works | | Procurement method | Not Specified | | Procurement method details | Not specified | | Tender suitability | Not specified | | Awardee scale | Not specified | | All stages | Planning | ## Dates | Field | Value | | --- | --- | | Publication date | 7 Jan 2025 | | Submission deadline | Not specified | | Future notice date | 30 Sep 2025 | | Award date | Not specified | | Contract period | Not specified | | 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 | THAMES WATER UTILITIES LIMITED | | Locality | READING | | Post town | Reading | | Postcode | RG1 8DB | | Country | England | | ITL 1 | TLJ South East (England) | | ITL 2 | TLJ1 Berkshire, Buckinghamshire and Oxfordshire | | ITL 3 | TLJ16 Berkshire West | | Local authority | Reading | | Electoral ward | Thames | | Westminster constituency | Reading Central | | Delivery location | Not specified | ## CPV Codes ### Divisions - 43 - Machinery for mining, quarrying, construction equipment - 45 - Construction work - 50 - Repair and maintenance services - 63 - Supporting and auxiliary transport services; travel agencies services - 65 - Public utilities - 66 - Financial and insurance services - 71 - Architectural, construction, engineering and inspection services ### Codes - 43123000 - Tunnelling machinery - 43320000 - Construction equipment - 45000000 - Construction work - 45112000 - Excavating and earthmoving work - 50000000 - Repair and maintenance services - 63712320 - Tunnel operation services - 65100000 - Water distribution and related services - 65320000 - Operation of electrical installations - 66000000 - Financial and insurance services - 71000000 - Architectural, construction, engineering and inspection services ## Release History - 7 Jan 2025 at 08:52 - Planning - Planning Notice - https://www.find-tender.service.gov.uk/Notice/000261-2025 ## Notice URLs - http://www.thameswater.co.uk - https://thames-wrmp.co.uk/projects/sesro/ - https://www.smartsurvey.co.uk/s/SESRO-Registration-of-interest/ ## 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-04cdb7. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-04cdb7.json.