Conservative Party research revealed Aberdeenshire had the most applications since March last year (428), followed by Highland (376) and Orkney (371).
Council staff handling the 2508 bids would have processed an average of almost seven applications every working day in the past year and half, according to the Conservatives.
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Conservative energy spokesman Murdo Fraser said: "These applications put council planning departments under immense strain, and cause great concern to communities worried about the impact a massive windfarm on their doorstep will have."
A Scottish Government spokeswoman said: "Our policy on windfarm applications aims to strike an appropriate balance between Scotland's massive green energy potential and the need to satisfactorily address the impacts on communities and the environment."