The Gulliver wind turbine at Ness Point has seen a major overhaul being carried out by renewable energy company Thrive Renewables.
However, some people have noticed the new blades are not turning, raising questions that the whole project is a "white elephant".
But Thrive Renewables say that while it is back on the grid, it is occasionally taken offline to make final improvements.
The company announced it was undertaking a "significant overhaul to secure the future" of the commercial wind turbine earlier this year.
It was due to be operating again at the end of........