Pen y Cymoedd Wind Farm, South Wales


Vattenfall, the Swedish power company, commissioned QuadConsult Limited to undertake CDM Support and Principal Designer duties for the largest on-shore wind farm in the UK outside Scotland, and Vattenfall’s largest onshore wind farm to date.  Seventy-six wind turbines have been sited on Natural Resources Wales’ forest estate in Neath Port Talbot and Rhondda Cynon Tâf unitary authorities to the south of the A465 Heads of the Valleys road in South Wales.  It is expected to generate enough power for 188,000 houses annually, equivalent to 15% of Welsh homes.

The project, which is also the highest wind farm in the UK, is split into four separate work packages:

  • Enabling works comprising a year-long tree felling operation – the largest ever undertaken by NRW – and geotechnical works;
  • Civil Engineering works comprising foundations, crane hardstands, on-site electrical cabling, and track construction;
  • Export cable works comprising the on-site sub-station and operations and maintenance facility, the cable from site to a new sub-station at Rhigos, and the Rhigos sub-station, excluding the utility Western Power’s works;
  • Turbine supply and install contract.

The project will cost around £365 million, and the CDM Support and Principal Designer role runs from 2012 to 2017.

In 2017 Vattenfall secured an amendment to its consent to provide for a large High Voltage battery installation to be used to regulate the flow of energy into the grid. Belectric, a German specialist company, has been appointed as Principal Contractor, and QuadConsult Limited has been retained as Principal Designer until Spring 2018.

QuadConsult Limited staff were proud to be part of the Inauguration of the windfarm which took place on site on 28 September 2017.  It was a prestigious event with full media coverage attended by, amongst others, executives from Vattenfall and Wales’ First Minister, Carwyn Jones.



QuadConsult Limited is delighted that the Constructing Excellence Civils Project of the Year 2018 for Wales has been awarded to Jones Bros & Balfour Beatty Joint Venture for the Vattenfall Pen y Cymoedd Wind Energy Project. QuadConsult Limited has had a long-standing involvement with the project – Director Chris Usher has been the CDM Co-ordinator/Principal Designer throughout, and Principal Engineer Meurig Hughes undertook the position of Resident Engineer during construction.  Meurig (far left in the photo) represented the company at the award dinner for over 500 industry professionals at the Celtic Manor Resort in Newport when the announcement was made, and the project now goes forward to the UK finals to be held in London in September.

  • Value:£365m
  • Client:Vattenfall