CEFAS25-80 ITT for bathymetric surveys at Sizewell C for the BEEMS programme

Tender description

Provision of bathymetric data at Sizewell to assess the geomorphological changes of the region, hence contributing to the ongoing monitoring of the Sizewell Coastline. These surveys are a regulatory requirement. The BEEMS (British Energy Estuarine and Marine Studies) programme is funded by Sizewell C Limited. Through this programme, Cefas provide authoritative scientific information on the marine and transitional waters in the vicinity of potential new build nuclear power stations and require the Supplier to deliver the elements described below.  The purpose of this project is to provide bathymetric data at Sizewell to assess the geomorphological changes of the region, hence contributing to the ongoing monitoring of the Sizewell Coastline. These surveys are a regulatory requirement under the Development Consent Order’s (DCO) conditions and the Coastal Processes Monitoring and Mitigation Plan (CPMMP). Cefas anticipate 4 - 6 Multibeam Echosounder (MBES) bathymetric surveys to IHO Special Order (at a minimum) within the Greater Sizewell Bay (GSB) for a 12-month period between October 2025 and September 2026 (with the option to extend for up to 4 additional years), roughly following a quarterly schedule with the potential for additional surveys subject to requirements. Exact survey dates will be agreed between Cefas and the supplier during the pre-survey kick off meetings, however the timings for surveys are dependent on construction schedules so may be subject to change at short notice. We currently expect the first survey to be required in October/November 2025, with following surveys in approximately January 2026, April 2026 and July 2026. The tendering process seeks to determine the Most Advantageous Tender (MAT) to award a Core Contract and up to 3 (three) Call-Off Contracts. The Supplier awarded the Core Contract will be contracted with the intention to deliver all Contract requirements for the duration of the Contract and any possible extensions. However, due to the nature of the work and the risks associated (such as changes in requirements from Cefas’ Customer Sizewell C Limited), the Buyer also intends to award up to 3 (three) additional Call-Off Contracts to the Tenderers ranked in the next 3 (three) positions (2nd, 3rd and 4th) below the Most Advantageous Tender. A Call-Off Contract will be used only in circumstances where the Core Contracted Supplier cannot provide the services. The Call-Off Contracted Suppliers will be approached in order of their ranked position (2nd, 3rd, 4th) from the evaluation process, to request provision of the required services. The Call-Off Contracts will be awarded based on no committed value or volume of work. Suppliers should understand that the Buyer may not award any work under the Call-Off Contract.