STENA Line has commissioned work worth £2.5 million with Harland and Wolff.
The ferry operator said six vessels will dry-dock at the Belfast shipyard over the summer for a range of repairs and upgrades.
London-based energy firm Infrastrata acquired Harland and Wolff in a £6m deal in late 2019.
Stena Europe, which operates the Rosslare-Fishguard service, is currently docked in Belfast, with the final works due to be completed on the Superfast VIII (Belfast-Cairnryan service) at the end of September.
The Swedish group said 2020 marks 40 years of its ships using the Harland and Wolff shipyard.
Stena Line recently rolled out two new Chinese-built ships on the Irish Sea with a third to follow in early 2021.
Paul Grant, Stena Line’s trade director said: “Despite the dramatic impact of the coronavirus pandemic on our business, regular ship upgrades and maintenance works are a very important element in our ship management operation.
“They help us to maintain our excellent reliability record and keep our Irish Sea fleet to the forefront of the ferry sector.”
Harland and Wolff’s managing director, John Petticrew, said: “Since InfraStrata acquired the Harland amd Wolff shipyard, we have built a strong working relationship with Stena Line, demonstrated through the repeat business we have seen with four ships in the yard since our acquisition.”
The shipyard firm recently firmed up a partnership with Spanish shipyard Navantia to bid for larger contracts, including Ministry of Defence work.
