THE controversial £20 million installation of ten new 300ft wind turbines between Newquay and Truro is complete.
Scottish Power has spent months replacing the 15 smaller 49-metre turbines at Carland Cross, near St Newlyn East, with the larger devices.
The plans were approved two years ago by a planning inspector following a heated six-day public inquiry.
The work will more than triple the wind farm's output from 6MW to 20MW of electricity – enough to power more than 12,000 homes.
Simon Christian, UK managing director at ScottishPower Renewables, said: "As the first generation of commercial turbines, they have proven to be extremely reliable and the site has performed exceptionally well for two decades.
"Since 1992 Carland Cross has generated enough clean, green electricity to power the equivalent of around 3,300 homes each year, displacing 8,500 tonnes of carbon dioxide.
"The success of the windfarm is due in large part to the selection of the site. We knew Carland Cross was a good location, with consistent wind speeds and good access.
"We are confident that Carland Cross will continue to make a valuable contribution to renewable electricity generation in Cornwall for decades to come."
In total around 100 people have worked or been involved in the project. A full-time supervisor will work on site, and there will be a number of maintenance contracts during the 25-year period.
Approval of the new turbines had been opposed by local group Residents Against Turbines (RATS), who argued that they would have an unacceptable visual impact.