The shipbuilding subsidiary of HS Ocean Group (HSOG) saidthe contract underpins 60 jobs at the yard for a year.
Cory will run the barges on the River Thames to transport incinerator ash across London.
No price was revealed.
Merseyside shipbuilder McTays has won a deal to design and build four barges for Cory Environmental.
The shipbuilding subsidiary of HS Ocean Group (HSOG) saidthe contract underpins 60 jobs at the yard for a year.
Cory will run the barges on the River Thames to transport incinerator ash across London.
No price was revealed.