The contract is part of the company's AMP7 investment programme.
The joint venture will bring together its consultancy, design, digital, construction and commissioning expertise to develop and deliver a range of solutions to maintain and improve Southern Water's water supply and wastewater treatment.
This builds on work undertaken in AMP6 and will see Costain and MWH Treatment deliver their element of the forthcoming AMP7 regulatory investment programme as part of Southern Water’s multibillion-pound Business Plan 2020-2025.
The AMP 7 contract will begin in April 2020 and will see Costain collaborating with Southern Water ensuring they optimise innovation and efficiency throughout AMP7 delivery. Pending final determination of Southern Water's 'Water for Life' Business Plan, this initial contract is worth approximately around £325 million to the joint venture in an equal share over the five-year period.
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Against a backdrop of rising regulatory requirements across the UK water sector, companies have pledged to provide value for money for their customers, while adding value to communities and the environment. This will be achieved through long-term stewardship of the environment, assets and relationships with customers.
Alex Vaughan, chief executive officer of Costain, commented: "Having now worked with Southern Water through the previous four regulatory AMP cycles, this contract extension is further testimony to the value of our long-term, strategic relationship. Together with our joint venture partner MWH Treatment, we will use our full range of integrated services to continue to deliver innovative efficient solutions to Southern Water to ensure we support them in meeting their regulatory obligations and the provision of excellent service to its customers whilst adding value to the communities and environment it operates in."
