Tersan Shipyard builds and repairs ships at Altinova, Yalova, on the Sea of Marmara, and this is the group's main shipbuilding and repair site. The company is privately owned and part of the Tersan group, whose other activities are ship repair, docking and conversion, ship owning and operation, ship agency, and land-based renewable energy. Tersan works from three locations, Yalova, Tuzla in Istanbul and Norway. Yalova and Tuzla together cover 320,000 square metres, including 55,000 square metres of closed area and 13,000 square metres of offices, with an average of 5,500 employees.
The yard builds offshore, fishing and passenger vessels among other types and has delivered LNG-fuelled and battery-powered ships; more than 90 newbuildings have been handed over. Recent deliveries are the DP2 construction service operation vessels Acta Pegasus in January 2026, Acta Hercules in March 2026 and Acta Gemini in June 2026 for Acta Marine, the factory freezer trawler Takapo for Aurora Fisheries in May 2026, the pelagic freezer trawler Annie Hillina for Parlevliet & Van der Plas in April 2026, and the fishing vessel Leinebris in February 2026. Steel was cut in June 2026 for the cable laying vessel NB1139 for LS Marine Solution. Tersan has been named Turkey's export leader in new shipbuilding six times in a row since 2013.
The shipbuilding slipway is wide enough for two ships side by side and is served by gantry cranes of 550 and 400 tonnes, with six outfitting cranes of 40 tonnes SWL, two of 30 tonnes and 58 auxiliary cranes from 5 to 60 tonnes on the piers. The main steel prefabrication workshop has four production lanes over 14,000 square metres, with CNC plasma cutting, bending, forming and panel, unit and block production indoors on a computer-controlled panel welding line. A second closed workshop of 12,500 square metres produces panels, units and blocks of up to 350 tonnes, and a further 6,000 square metres is dedicated to special alloys such as stainless steel and aluminium. Five paint halls cover 4,750 square metres, and block production and erection areas total 44,000 and 38,000 square metres.
Ship repair has been offered for more than 25 years. Two floating docks work at Yalova, one lifting 50,000 tonnes at up to 9 metres draft with two 25-tonne dock cranes and one lifting 9,000 tonnes at up to 7 metres draft with two 10-tonne cranes; a third dock lifting 6,500 tonnes at up to 6 metres draft belongs to the separate Tuzla repair branch across the Gulf of Izmit. Repair berth cranes run to two of 275 tonnes, two of 36 tonnes, two of 25 tonnes and two of 10 tonnes, and a 4,000 square metre mechanical workshop handles repair, maintenance and overhaul. Conversion work covers ballast water treatment systems and scrubbers. Electricity comes from renewable sources, I-REC certificated wind farms together with rooftop and land-based solar of nearly 60,000 panels, covering nearly 30 per cent of total energy need.
