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Internal view of Bramford building

Lean substations, South East England

As part of National Grid’s South East Electricity Substations Alliance (SEESA, incorporating National Grid, Alstom, Skanska and Mott MacDonald) we developed a new design for gas insulated switchgear (GIS) substations.

Savings
27%
Capital cost
32%
Time
23%
Embodied carbon

Driving efficiencies through standardisation

SEESA used the lean process and product improvement techniques to develop a standardised design consisting of an uninsulated, naturally ventilated aluminium-clad GIS hall and a standard modular annex. All components are manufactured offsite and combined to meet a broad range of requirements.

The first project, a 400kV substation at Bramford, was delivered for 27% less than the estimate for a conventional build. The solution can be applied in any location and has been further refined, offering additional savings of 10% cost on foundations, 30% cost on protective bunds and 47% on steel. Combined, these yield a further 25% cost saving and a carbon reduction of 75t per building.

Client: National Grid

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