CONTROVERSIAL plans to install 10 100 metre wind turbines between Newquay and Truro are underway.
It forms part of an on-going project to repower Carland Cross wind farm - close to St Newlyn East village.
Scottish Power, which is behind the scheme, said the process to remove the existing 15, 49 metre turbines and replace them with 10, 100 metre turbines has begun.
The plans were given the green light some two years ago by a Planning Inspectorate following a heated six-day public inquiry.
Gordon Anderson, project manager at ScottishPower renewables, said the Carland Cross repowering project is one of only a few "ever to be undertaken in Britain".
"Work is progressing well on repowering Carland Cross," he said.
"We are in the process of removing the existing 15 turbines, which we hope to complete in February 2013. The process of installing the ten new turbines began in December 2012, and is expected to be complete in April 2013.
"In total up to 100 people have worked on or been involved on this project, which is one of only a few repowering projects ever to be undertaken in Britain.
"Cornwall was a pioneer in terms of wind energy in the early 90's, and it is also leading the way again in terms of repowering projects in the UK. We take great care when carrying out our work, and we look forward to seeing Carland Cross continue its role as an important source of renewable energy for Cornwall."
The repower will triple the wind farm's capacity from 6MW to 20MW of electricity.
The plans for Carland Cross caused controversy with some nearby residents who campaigned for them to be refused planning consent.
They formed the Residents Against Turbines (RATS) group and argued at the time that the new turbines would represent an unacceptable visual impact on the area.
A spokesman for RATS said it was unable to comment on the latest development at this time.