DSTN Trenton has delivered the final tower to Sprott Power's 31.5-megawatt wind farm in the town.
The company built 15 towers for the project.
Premier Darrell Dexter says the delivery marks a milestone in the development of the wind farm plant since it launched two years ago.
The provincial government secured a 49 per cent stake in DSTN Trenton for $60 million in 2010.
The former railcar plant closed in 2006, but was revived by Korean-owned Daewoo Shipbuilding and Marine Engineering.