Main Works Contract for White Horse Reservoir

From January 2026, the South East Strategic Reservoir Option (SESRO) project name is changing to White Horse Reservoir, with a strapline of 'a space for nature, a place for people.' As our reservoir proposals have evolved, so too has the potential legacy it could have. The proposed reservoir is a critical drought insurance policy for the next century and beyond - but it's also being designed as a place for people to use and enjoy for many years to come. At this exciting stage in development, it's important that we give the project a new identity: one that better reflects the crucial role it will play in shoring up water supply, as well as the broader benefits it will deliver for future generations. It is the same project, with the same vision, but with a new name that will help people recognise it more easily. For us, the name White Horse Reservoir roots this project in local heritage and in the natural world around us. Equally important as the project's new name, the strapline tells us more about where the project's strengths lie; a space for nature, a place for people. To stay up to date and find out more, please visit www.thames-sro.co.uk/whitehorsereservoir Thames Water is leading the development of the new reservoir project, in partnership with Affinity Water and Southern Water. Thames Water is responsible for delivering the development phase, developing the commercial model for the project and for running the procurement processes to appoint the project's Main Works Contractor (MWC) and later, the appointment of an Infrastructure Provider (IP). Thames Water is delivering the project under the Specified Infrastructure Project Regulations, or "SIPR", first established and used for the Thames Tideway Tunnel project. Under this approach a new regulated entity, known as an IP will be established to finance and deliver the project, holding a Project Licence granted by Ofwat. Delivery under SIPR is subject to a notice to specify an infrastructure project, which is currently under development between Thames Water and Ofwat. Following the approach taken on the Thames Tideway Tunnel project, Thames Water is separately procuring the Main Works Contract and the IP Contract. This tender notice relates to the procurement of the Main Works Contract only, which comprises the award of a multi-supplier Framework Agreement and a single Call-Off Contract. The Framework Agreement will be a bespoke framework agreement which is described further in the document associated with this tender notice. The Call-Off Contract will be based on the NEC4 Engineering and Construction Contract June 2017 (with amendments January 2023) using main option C, secondary options including clause X22 (early contractor involvement ("ECI")), and bespoke amendments, which are described further in the documents associated with this tender notice. The Call-Off Contract two-stage ECI approach comprises a design and construction planning stage ("Stage One"); and a detailed design and build stage ("Stage Two"). The two-stage ECI Call-Off Contract includes a key decision point that is based on conditions precedent that must be satisfied before a Notice to Proceed to Stage Two can be issued. The Development Consent Order (DCO) reference design (provided by others) will inform the requirements and constraints within the Call-Off Contract scope (Scope). The MWC will develop the design for construction to comply with the Scope, which will be integrated with the discharge of certain planning requirements "secondary consents" and construction planning for Stage Two. Tenderers will be required to submit a Target Price to deliver the Call-Off Contract requirements included in the tender documents. As part of the Call-Off Contract, the Pricing Information will set out the circumstances where the tendered Target Price can be adjusted during Stage One ("Adjustment Events"), for example, if the Client changes the Scope. Following a Notice to Proceed to Stage Two, the Target …