The Welsh Government aims to have doubled the amount of electricity generated from renewable sources by 2025, and has designated seven Strategic Search Areas – high, remote and open areas of land where large scale wind energy projects might be developed.The associated environmental implications of development in those areas need to be carefully assessed, with views and landscape character being taken into account, including an assessment of how individual developments might influence one another. When NUON Renewables proposed to build the Hirddywel Wind Farm in Powys, it had another proposed wind farm to its east and an existing development nearby due to be ‘repowered’ with fewer but taller turbines.AMEC Environment and Infrastructure UK Ltd was commissioned by the developer to conduct the landscape and visual assessment. Through photomontages and 3D visualisations, the consultancy was able to clearly explore and evaluate the potential cumulative impacts of the development.