Acta Hercules
A Construction Service Operation Vessel (CSOV) for the Offshore Wind Industry. Often described as the four‑wheel drive of the sea, a TWIN X‑STERN® vessel combines a bi‑symmetric hull with propulsion at both ends to deliver superior control and efficiency in either direction.
Primary specifications as built
Additional Data
Ship history
Acta Marine was the first shipowner to contract vessels based on the highly optimised hull form ULSTEIN TWIN X-STERN, which offers unmatched workability in field and adverse weather conditions. The Acta Hercules and three sister vessels have been constructed at the Tersan shipyard.
Milestones
Contract signed: June 2022
Best Industrial Design Company Award: October 2022
Steel cutting: March 2023
Project update all four vessels: January 2025
Vessel delivery: March 2026
On 24 March 2026, Acta Marine announced that Acta Hercules had been delivered by the Tersan Shipyard in Türkiye. The vessel is the second of four newbuild Walk-to-Work (W2W) Construction Service Operation Vessels (CSOVs) designed by Ulstein Design & Solutions AS.
Like her sister vessel Acta Pegasus, Acta Hercules is methanol-ready, equipped with dual-fuel main engines capable of operating on marine gas oil (MGO) or a blend of MGO and methanol. The vessel also features a hybrid power solution with significant battery capacity, improving energy efficiency and reducing emissions during offshore operations. These technologies support Acta Marine’s strategy to operate a future-ready, lower-emission fleet aligned with the growing offshore wind sector.
Acta Hercules has a long-term charter with Vestas, supporting offshore wind construction projects in Northwest Europe and contributing to the continued expansion of the region's renewable energy infrastructure.