It has withdrawn the planning application for the 25-turbine Mynydd Mynyllod Windfarm, which has been on the drawing board since 2010.
The company said detailed technical and environmental studies had revealed issues around landscape and visual effects particularly relating to grid connection.
A ScottishPower Renewables spokesperson said: “We are very grateful for the feedback and advice we have received from the very many interested parties during the development of the project. We have consulted widely with a range of stakeholders, including county councils, community councils and the Mynydd Mynyllod Community Liaison Panel.”