Tender: Design, Build and Operate Two Ground-Mounted Solar PV Plants – Little Marlow & Maidenhead (1,000kWAC & 450kWAC)

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Thames Water is seeking a supplier for the finance, engineering, design, procurement, construction, commissioning, operation and maintenance of two ground-mounted solar photovoltaic (PV) plants at Little Marlow and Maidenhead with maximum capacities of 1,000 kWAC and 450 kWAC. The supplier must deliver full design and engineering, procurement, installation, commissioning with Distribution Network Operator (DNO) witnessing, testing and approval, support OFGEM accreditation for REGOs, ongoing operation and maintenance, monthly and annual reporting, training in emergency procedures and essential operational activities, documentation, demarcation fencing and signage, and meet biodiversity net gain and any visual impact requirements. The supplier must be able to design and optimise the PV installations for behind-the-meter use to achieve an attractive payback period and NPV, and meet key requirements including Achilles Verification, relevant project planning/management experience, and compliance with water industry standards such as WIMES where asset interaction is required. The contract will be awarded either as an EPC or a PPA (only one to be awarded) and Thames Water reserves the right to refine award criteria; deadline for requesting access to and submitting the PSQ is 15 September 2026 at 12:00 p.m.