Its developer, Scottish Power Renewables, has submitted plans to add a further 36 turbines at Whitelee to the Scottish government.
Keith Anderson, director of ScottishPower Renewables, said: "To complete Europe's largest on-shore wind farm ahead of schedule is a major achievement."
He added the green energy produced will be beneficial to the local area and also make a significant contribution towards national renewable energy targets."
A recent research paper by Atmos Consulting highlighted that increasing average wind speed along the south-east could provide opportunities for wind power generation in the region.
It also suggests that higher wind speeds in summer could result in a flatter seasonal cycle, meaning greater amounts of power are produced and reliance on other energy forms is lowered.
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