As part of its AMP8 Net Zero Investment Programme, the water company is looking to deliver Cover and Treat solutions across approximately 23 sites (subject to change) to reduce process emissions by approximately 19,618 tCO₂e.

Sister company Hafren Dyfrdwy also has an AMP8 regulatory commitment to deliver a Cover and Treat solution at one site, contributing a further reduction of approximately 411 tCO₂e.

The scope includes Activated Sludge Plant (ASP) lanes and Liquor Treatment Plant (LTP) tanks associated with wastewater and sludge treatment processes. The assets operate continuously and contain biologically active, aerated liquors that generate off-gases during normal operation.

Any proposed tank cover solution must be suitable for installation over live operational treatment assets and must not adversely affect process performance, operation, maintenance activities or access requirements.

The final number, size and location of sites may be subject to change and will be defined within the procurement documents.

The successful suppliers will be required to design, manufacture, supply, deliver, install, test and commission impermeable tank cover systems for Activated Sludge Plants (ASPs) and Liquor Treatment Plants (LTPs).

The anticipated scope includes all activities necessary to provide a complete and operational tank cover solution, including design development, calculations, drawings, fabrication, quality assurance, delivery, installation, testing, commissioning, operation and maintenance documentation and warranties.

The suppliers will be expected to assess the suitability of existing tank structures to support the proposed cover system, including consideration of structural condition, load paths, connection methodology and access requirements. Intrusive investigations and structural remediation works are not currently anticipated to form part of the scope unless specifically instructed.

They will also be required to work collaboratively with the Contracting Authority and its appointed designers to define interfaces between the tank cover system and any future extraction or treatment systems.

Design and delivery of extraction and treatment systems, including extraction fans, ductwork and treatment processes, is not expected to form part of the contract.

Current estimated start and end contract dates are 15 January 2027 to 14 January 2031 with further possible extension options up to 14 January 2035.

Severn Trent is reserving the right to run an Expression of Interest to determine supplier's capacity in meeting the requirements - in this event the EOI will be issued to all Framework Agreement suppliers. The utility may award call-off contracts of any value directly under the Framework without the requirement to conduct a mini- competition with all appointed Framework suppliers.

Where the company runs a mini competition, all Framework Agreement suppliers will be invited – as part of the mini competition process Severn Trent will issue an Instructions Briefing Pack outlining the process and how submissions will be evaluated. This may include criteria such as:

Deadline for submission of enquiries is 4:00pm on 15 July 2026 and deadline for requests to participate is 2:00pm on 22 July 2026. Estimated contract award decision date is currently 15 January 2027.

Interested suppliers will be required to complete a Pre-Qualification Questionnaire (PQQ) to assess their suitability to participate in the procurement process.

Severn Trent anticipates that a minimum of seven suppliers will be shortlisted to progress to Stage 2 - Request for Proposal (RFP) - when they will be invited to submit detailed proposals.

Following evaluation of the written RFP submissions, at Stage 3 shortlisted suppliers may be invited to deliver presentations, demonstrations and/or participate in question-and-answer sessions. Stage 3 may be followed by further shortlisting of participating suppliers.

Stage 4 may include written and/or verbal clarification meetings and negotiations with some or all participating suppliers, followed by Stage 5 - Best and Final Offer (BAFO)

Following any clarification and/or negotiation stages, when shortlisted suppliers may be invited to submit a Best and Final Offer (BAFO) which reflect the outcomes of discussions held during the procurement process and represent the supplier's final tender submission. Stage 6 covers Final Evaluation and Contract Award

Further information regarding the procurement process will be provided within the relevant tender documentation issued at each stage.

The procurement is being conducted via Severn Trent’s SAP Ariba e-tendering system - click here to access the portal