work at the site near Windygates
was part of a £40 million project to increase the efficiency and environmental performance of the distillery.
Diageo is investing £100 million in all to expand its Scotch whisky operations and capitalise on growing global interest in the spirit.
Scotch export sales topped £2.8 billion last year, a rise of 14% on the previous year, according to figures from the Scotch Whisky Association.
As well as expanding Cameron Bridge, the drinks giant plans to build a new malt distillery on Speyside.