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    Customer

    AES Wind Generation

    Location

    Near Dunbar, Scottish Borders

    Value

    £4.6m

    SUMMARY OF WORKS AND SERVICES UNDERTAKEN

    • 19 drained foundations of 13.3m diameter, using 19t of steel reinforcement and 186m? of concrete
    • Three submerged foundations of 15.75m diameter using 26t of steel and 280m? of concrete
    • 6km of 4.5m wide site tracks
    • 6km of HV cables
    • Design and construction of 33KV sub-station
    • Erection of temporary met mast and decommissioning of a permanent met mast

    Knights Brown was awarded the balance of plant contract to construct a 22 turbine wind farm in the Scottish Borders near Dunbar. The site was bisected by the A1107. We were also contracted by Scottish Borders Council for undertaking all off-site road works.

    Due to an initial delay in contract award, acceleration of foundation construction and site works was required and achieved enabling us to meet the programme delivery dates for turbine components. This also ensured we adhered to the environmental restrictions during hen harrier breeding season (March to mid-August.)

    The site provided significant challenges from groundwater which, if uncontrolled, would flood the excavation and weaken the formations. To prevent this, stringent controls were put in place. We encountered difficult ground conditions with large quantities of peat excavated prior to the construction of foundations and crane pads. A floating track design was adopted on site as required.

    To accommodate turbine delivery a cutting for the site track along a 300m stretch of hill to achieve a 10% gradient was engineered to maximize site won rock, then reused to create tracks and hardstanding.

    our sectors

    Sites are always very well presented. First impressions count and if a site looks well organised and clean when you arrive then generally this is applied throughout the management of the projects. Indeed, all five projects I am Cummins PM for, have been managed to a high standard and equally the safety records and standards are very good.

    - Iain Brooks, Cummins

    Site staff were pleased to have had Knights Brown on the team, they were proactive from day one to the end towards potential issues and responsive to a changing site environment for works.

    - David Sheldon, Cummins