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Middlemuir Windfarm – 132kV Cable Civil

  • Project Type Cable Installation
  • Client Scottish Power Energy Networks Limited
  • Company Involvement Roadbridge was appointed as Contractor for this project in April 2017. Iberdrola Engineering & Construction UK Networks acted as the Principal Contractor on the project.
  • Form of Contract NEC3 Option B (with amendments)
  • Dates April 2017 – February 2018
  • Location Coalburn, South Lanarkshire, Scotland



Key Features

  • Installation for a buried, single trefoil circuit, ducting system to facilitate the installation of a 132kV underground power cable and associated fibre optic cables to connect Middlemuir & Coalburn Substations
  • 7km of duct route was in public highways, with 6km in agricultural land
  • Liaison between the Local Authority and the motorway maintenance contractor
  • Close liaison with Scottish Water around critical national assets along the ducting route; 19NO. interfaces with critical assets
  • Routing through a ground water dependant terrestrial eco-system (GWDTE) and associated burn flood plain for approximately 600 meters
  • A total of 85 no. service crossings were encountered; of which 44% were unchartered
  • 4 n o. Special Engineering difficulties: 231m long HDD crossing Poniel Bridge, 120 m long HDD crossing Old Rail Bridge