Pen y Cymoedd ("Head of the Valleys") is a wind farm located between Neath and Aberdare in south Wales.

Natural Resources Wales signed a lease agreement with Vattenfall of Sweden and its British-based subsidiary Vattenfall United Kingdom (formerly Nuon Renewables), to develop what will be the United Kingdom's highest altitude wind farm, on a site owned by Natural Resources Wales, previously the Forestry Commission Wales.

During the planning process, Vattenfall (at that time: Nuon) agreed to contribute about £1.85m annually to a community fund and to invest £3m in a habitat restoration scheme, and the following parties contributed to the debate:[5] The project gained final planning permission in May 2012.

[6] The first turbine was fully completed in April 2016[7] and began generating electricity in autumn 2016.

The final (76th) turbine was installed on 2 March 2017, and the farm has been fully operational since 7 May 2017.