Morgan Sindall Infrastructure, Costain, and HOCHTIEF (UK) have been awarded contracts valued at up to £2.9bn ($3.9bn) in total to carry out nonnuclear infrastructure works at the Sellafield site in England.

The contracts are set for an initial period of nine years. There is an option to extend the arrangements by six more years, which could take them through to 2040.

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The scope of work across the three partner roles includes detailed design, procurement, installation, construction, commissioning, and handover processes.

These involve electricity distribution, water supply, road and rail networks, bridges, foundations, and security systems.

Each company will focus on a specific area. Under the agreement, Morgan Sindall will be the electrical distribution partner.

The company will oversee maintenance and upgrades to Sellafield’s electrical network, working with design partners Baker Hicks and GHD.

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Morgan Sindall managing director Simon Smith said: “We have been delivering in West Cumbria for over 15 years, and we are delighted to build on this further with the award of the Infrastructure Delivery Partnership [IDP].”

Costain has been appointed as utilities delivery partner for work valued at up to £1bn.

Costain chief executive officer Alex Vaughan said: “This new contract award with Sellafield, with whom we have been working with since 2005, is testament to our strategy of developing long-term relationships with tier 1 customers, building strong and collaborative partnerships, broadening our service offering, and maintaining consistency and continuity of workflows.”

HOCHTIEF (UK) will deliver civil infrastructure works under a contract worth up to £595m.

Specifically, the company will provide design, engineering, and delivery services in support of Sellafield’s nuclear operations and decommissioning.

HOCHTIEF CEO Juan Santamaría Cases said: “HOCHTIEF has an unbroken legacy in the nuclear sector since the 1950s and is a trusted partner in engineering and construction for some of the world’s most critical nuclear programmes.”

The companies will operate as part of the site’s new IDP.

This IDP replaces Sellafield’s previous Infrastructure Strategic Alliance.

Sellafield chief supply chain officer James Riddick said: “Our job at Sellafield is to create a clean and safe environment for future generations. That means safely, securely, and cost effectively dealing with the legacy of historic operations on our site.”

The contracts also include provisions aimed at supporting economic and community development in West Cumbria.

Commitments cover local business support, access to Sellafield contracts, job creation, workforce development, and skills training opportunities.

The partners will also implement a joint sustainability plan aligned with local priorities.