Borders Councillors are opposing plans for the 12-turbine expansion by EDF Energy Renewables of the 144MW Fallago Rig wind farm, going against recommendations by planners.
The proposal would boost total power at the operational project by 41.4MW, pushing overall capacity to 185.4MW.
The councillors cited the cumulative impact of the project on the local landscape as the reason for its decision.
EDF is planning to install 3.45MW hardware with tip heights of up to 126.5 metres and rotors of up to 92 metres.
The Scottish government will make the final decision on the extension.
Image: Fallago RIg (EDF)