Tender: Supply, Installation and Maintenance of CHP Engines for Thames Water Wastewater Sites

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Thames Water is seeking a supplier for the supply, installation, commissioning and maintenance support of Combined Heat and Power (CHP) engines across multiple wastewater treatment sites to maximise engine availability, performance and energy recovery from biogas while minimising flaring. The procurement covers new CHP units and ancillary components, spare parts stock holding, planned and reactive maintenance in line with the manufacturers' O&M manuals, and technical support to ensure safe, efficient lifecycle operation; it aims to secure capacity through AMP 8 and AMP 9, promote standardisation across the CHP estate, leverage volume-based commercial value, and support low-emission, high-performance solutions compliant with evolving environmental regulations (including emissions to air considerations such as methane slip and possible carbon capture under the Industrial Emissions Directive). Thames Water currently operates 47 CHP engines across 24 wastewater treatment sites, many approaching end of life, and anticipates replacing an estimated 10–16 engines (100 kW–1500 kW electrical output) during AMP 8 with further installations planned for AMP 9 (including upgrades at an additional seven sites). A competitive tender will be run with an intended single supplier award (the authority reserves the right to appoint more than one supplier). Note the deadline to request access to and submit the PSQ is 28 November 2025 at 10:00 am.