Clyde Wind Farm Extension

Sweco supported long term client SSE in the development and construction of their Clyde East Wind Farm Project in South Lanarkshire, Scotland, which acts as an extension to the existing Clyde Wind Farm. The “extension” consists of 54 Siemens wind turbines with a total combined capacity of 172.8MW, first generating in early 2017.


Client: SSE

Date: 2015 - 2017

Location: South Lanarkshire, Scotland

Value: £1.24m


With a full time site presence during the 18 month foundation construction program, Sweco provided technical assistance to SSE on the ground as well as providing quality management and control throughout the foundation construction process.


Responsible for the client designed elements of the project, Sweco supervised and reported the ground investigation works on the site, then designed a site and turbine specific gravity foundation for optimal efficiency along with a steel portal framed permanent welfare building.

One such example of this site based technical assistance; during a turbine foundation base pour, a batching plant breakdown caused the pour to be abandoned with approximately 30m³ remaining to be placed. This caused an area covering approximately half the base to be left with exposed reinforcement.

Sweco, in collaboration with the client/contractor, developed a remedial design for implementation. This remedial design involved hydro-demolition and the retrospective installation of 297no reinforcing bar dowels cored and resin anchored into the existing concrete. Following installation of these dowels the remaining concrete was poured to finished design level and profile.

In addition to Sweco’s primary scope we also provided preliminary/conceptual design for the 35km of site access tracks and following contractor appointment (Balfour Beatty & Jones Bros Joint Venture), we supported them under separate contract with detailed design of these tracks.

This detailed design contract also included trackside drainage, crane platform/hardstands and turbine lay down areas.


  • Supervision of ground investigation works
  • Structural design of gravity wind turbine foundations
  • Geotechnical design and ground condition appraisal
  • Structural design of two meteorological mast foundations
  • Civil, structural, mechanical and electrical design of permanent welfare building
  • Full time on-site technical advisor for construction quality monitoring