Project Overview

Design and construction of a new hydroelectric scheme at the Radyr Weir on the River Taff in Cardiff. The works involved installation of two 200kW Archimedes screw turbines within the river bank area, behind the eastern abutment of Radyr Weir.

Works also included construction of an inlet channel, beginning just upstream of the weir, diverting water to the Archimedian screw assembly. Works for this hydroelectric development included: 

  • Design development of all civil, mechanical and electrical work
  • Extensive Temporary Works design and installation, including one round 160 linear metre of sheet piling and excavation of up to 3m below river level
  • Site clearance
  • Access road construction
  • Culvert installation at the Melingriffith Feeder Channel (historic watercourse)
  • Demolition of existing flood defence wall and fish pass
  • Installation of a temporary fish pass and construction of a new fish pass
  • Construction of a new flood defence wall
  • Reinforced concrete structures – inlet channel and structures surrounding the screws
  • Installation of the Archimedes Screws
  • Installation of trash screens
  • Electrical installations and connections
  • Building construction to house the generators and transformers
  • Landscaping
  • Environmental Management, including an Otter Management Plan and installation of Bat Boxes 

Awarded from an early design stage, we were responsible for appointing a design team consisting of a technology consultant, civil designer, M&E designer and turnkey equipment provider. 

During the pre-construction period we carried out Site Investigation works to inform the temporary and permanent works design, carried out river level and flow monitoring to rationalise process equipment layout, developed the design to integrate process equipment and civil works using a fully coordinated BIM model, refined the programme and updated the scheme cost through implementation of Compensation Events.

In June 2017 the scheme was awarded the ICE Wales Cymru George Gibby Award. 

Project Gallery


Cardiff Council



Project Value


Contract Period

55 weeks