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Thames Tideway Tunnel
Sewerage upgrade project in London, England
Thames Tideway Tunnel
The Thames Tideway Tunnel is a deep-level sewer along the tidal section of the River Thames in London, running 25 kilometres (16 miles) from Acton in the west to Abbey Mills in the east, where it joins the Lee Tunnel which connects to Beckton Sewage Treatment Works. The tunnel is designed to capture almost all the raw sewage and rainwater from combined sewers which would otherwise overflow into the river during heavy rain. The sewage can be stored in the tunnel until it can be treated at Beckton. Bazalgette Tunnel Limited (BTL), backed by investors Allianz, Amber Infrastructure, Dalmore Capital and DIF, is the licensed infrastructure provider for the tunnel's finance, building, maintenance and operation. On 3 November 2015, the license award was made by Ofwat, ensuring the start of the project. Since then, BTL also trades as Tideway. Construction of the Tideway Tunnel began in 2016 and the project was due to be completed by 2024, but the COVID-19 pandemic delayed this to early 2025. The...
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