Hirddywel, Powys Hirddywel wind farm is a nine turbine wind farm proposal in Powys, Mid Wales. The project is currently in the planning process. Vattenfall is currently one of the leading onshore wind energy developers in Wales. It has committed to working to maximise the potential opportunities available to local communities and businesses through its work. Find out more about this project. Community Investment Find out more about Vattenfall’s community investment work Supply Chain Find out more about the potential opportunities companies in the wind industry.