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Mott Macdonald

South East Electricity Substation Alliance

Project description

The South East Electricity Substation Alliance is part of National Grid’s Electricity Alliance in England and Wales, formed to deliver a major investment programme to update and develop the high-voltage transmission network.

Mott MacDonald’s role

With its technical, design, project and programme management skills, Mott MacDonald has a number of specific roles it contributes to the South East Electricity Substation Alliance. These include electrical and civil engineers developing solutions, providing design assurance, checking of the overall project design and ensuring buildability and maintainability plus providing environmental and ecology surveys, civil detailed design/architecture and programme management for schedule, risk and work book change control.

Other parties

Client: National Grid
JV partners: AREVA and SKANSKA

Start/finish dates

April 2007 – March 2012 (with potential for a further 5 year extension)


£550M over five years


National Grid required a delivery model to plan investment and construction programmes over several years at a time. The collaborative alliance method of working is the most effective and efficient way to resource the increasing workload, allowing construction partners to programme, design and deliver safe and sustainable solutions.

Interesting facts

■ The Alliance carries out construction works in the South East of England to connect new electricity generation assets such as wind farms and power stations.
■ It also enhances and replaces existing National Grid assets to ensure the continued safe and reliable operation of the high-voltage network.

Estimated new generation capacity
Geotechnical and environmental surveys completed in year one
323 tonnes
Weight of typical super grid transformer
Of concrete poured in first two years  

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