Thames Water has started the process to procure contractors to design and build the £4.2bn Thames Tideway Tunnel.
It has published a contract notice in the Official Journal of the European Union (OJEU) calling for “contracting entities” for the three main design and construction contracts, estimated to cost between £1.4bn and £2.25bn in total.
The 25km long Thames Tideway Tunnel super sewer will run between Thames Water’s existing sites at Acton in west London and Abbey Mills to the east of the city.
It is designed to collect overflows from existing sewers to prevent raw sewage going into the River Thames.
The company has split the project geographically, with the three main contracts covering the west, central and east sections of the tunnel.
All three contracts include the main tunnel drives, shafts and connections for the 6.5m to 7.2m diameter bored tunnel.
The OJEU notice makes it clear that winning contractors will have to procure the tunnel boring machines and diaphragm walling equipment. Thames Water has sent out prequalification documents, with a view to having a shortlist of design/build contractors by November.
It will give shortlisted contractors around five months to submit their tenders, and plans to announce preferred bidders in early 2015.
“We want contractors with the right expertise and experience, who will deliver the best value for money for our customers,”- said Thames Tideway Tunnel managing director Mike Gerrard.