Kier wins contract to deliver £66m sewage upgrade project in London

WCN Editorial Team 23 Sep 2021 EUROPE ENERGY & UTILITIES

UK-based water services firm Thames Water has appointed Kier to deliver a £66m improvement project at its Mogden Sewage Treatment Works (STW) in Isleworth, West London.

Work on the project includes significant modernisation and improvements to the existing facility as well as providing additional resilience and capacity.

It also includes onsite energy generation and improving the capacity of preliminary treatment as well as the resilience of the sludge and digester streams at Mogden in preparation for AMP8 works.

Kier, along with its partner Aecom, will upgrade the existing tanks and build new ones, replace the key mechanical and process equipment and upgrade electrical panels.

Kier Infrastructure managing director Mark Pengelly said: “We will be working with AECOM as design partners and we have selected key Kier and AECOM personnel for their experience and knowledge of STW and complex large-scale civil engineering.

“They will bring a tried-and-tested approach, having collectively worked together over the past six years, at Deephams STW.”

Built in the 1930s, Mogden STW is claimed to be Thames Water’s third largest treatment works, spanning 55ha and serves approximately 2.1 million people.

Thames Water capital delivery director Francis Paonessa said: “Our investment in Mogden Sewage Treatment Works will be essential in modernising one of our most urban treatment works.

“It will play an essential part in our work to reduce the impact on our neighbours, while ensuring Mogden can handle the expected increase in waste from London’s growing population in the future.”

Last year, Kier secured a place on Thames Water’s £2.6bn AMP7 capital programmes framework and also provided planned as well as reactive services through the Infrastructure Alliance.


Mogden sewage treatment works serves approximately 2.1 million people. Credit: Kier Group plc.

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