The Thames Tideway Tunnel (Tideway) is a new investment in the London sewer network, which will carry sewage and storm water discharges from the existing sewerage network. London's Thames Tideway improvements will significantly reduce polluting discharges in a typical year by about 37 million cubic metres, resulting in a healthier river for London's citizens and wildlife.
A 25km long, 7.2m diameter tunnel running up to 65 metres below the river Thames, replacing the Thames as a "sewer of last resort”. The Thames Tideway Tunnel will transport overflow sewage to a pumping station located at Abbey Mills (East London) before final treatment in Beckton Sewage Treatment Works.
The tunnel will be built under three separate construction contracts, each covering a distinct physical section of the network. Construction activities are expected to complete in 2024. The tunnel will cost £3.8bn to complete, and an additional £1.1bn has already been spent by Thames Water for preparatory works.
Length of sewer
Diameter of new tunnel
Waste treated when operational
37m cubic metres
New Public Space
Project highlights include:
- A yielding investment through both construction and operating periods
- A fully index-linked revenue stream
- An investment grade rated entity that is regulated by Ofwat
More details can be found on Tideway's website