Projects · Power & Grid

Windyhill substation, Hardgate, Clydebank, West Dunbartonshire·In developmentPower & Grid

Windyhill to Lambhill to Denny North 400kV Upgrade (DLUP)

  • StageGIS contract signed with GE Vernova (announced 15 October 2026)
  • Next milestoneDelivery of the new Windyhill GIS substation
  • Last checked1 November 2026
Source: SP Energy Networks release (15 October 2026) and RIIO-T3 engineering justification paper →

What has changed on this project, and when

  • Next milestone: Delivery of the new Windyhill GIS substation2 November 2026 · previously: First-round public consultation runs from 3 November to 7 December 2026, with substation works due to start on site in April 2027 and completion planned for December 2029.
  • Stage: GIS contract signed with GE Vernova (announced 15 October 2026)2 November 2026 · previously: GIS contract signed with GE Vernova (15 October 2026), overhead line consents not yet sought
  • Value: Not disclosed2 November 2026 · previously: £131.27m (2023/24 prices)

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