In a complete turnaround Thames Water (may 2026) announced that the TTP will not be built above the storm tanks in the Mogden site. Instead another site within Mogden site will be used.
Thames Water are LIKELY - but not confirmed yet - to run a consultation on this change later this year.
The main tunnelling works for the treated sewage tunnel will still have to happen and still need a starting point. This will involve 24/7 works probably on the the western side of Mogden.
The issues of 24/7 works, HGV traffic and other construction issues will still affect everyone that lives around Mogden - But now Thames Water has just left everybody hanging whilst they decide when they will confirm the changes.
In 2025 RAPID highlighted that there is no “… detailed plan for [an] alternative option if the space at Mogden Wastewater Treatment Works is no longer available to use. The space is limited and in high demand and finding an alternative space may lead to changes in the TTP layout, design, and location within Mogden. This could lead to an impact on the scheme costs and programme.”.
So the potential of changing the location of the TTP has been on the cards for a long time! And it is incredible that Thames Water has still not described how construction of the TDRA infrastructure will not interfere with the operation of Mogden STW nor with the need to increase the capacity of Mogden over time.