Acta Hercules Delivered to Acta Marine2

Acta Hercules

Construction Service Operation Vessel (CSOV) for the Offshore Wind Industry. The ULSTEIN TWIN X-STERN® has several characteristics, as a ship with two sterns and four main propeller units: two at each end.

Vessel Type
Related Solutions
Ordered By
Acta Marine
Owned By
Acta Marine
Built By
Partner yard
Year
2026
IMO Number
9976769
Operated By
Acta Marine

Primary specifications as built

Length
89.9 m
Beam
19.2 m
Dead weight
2,200 tonnes
Draught (max)
5.9 m
Speed (max)
12.8 kn
Accommodation
135 POB

Additional Data

Deck area, in warehouse
500 sqm
Deck area, on cargo deck
440 sqm
Fuel oil
450 sqm
Methanol
380 sqm
CTV fuel
65 sqm
Fresh water
340 sqm
Ballast water
1,500 sqm
Note: Specifications may have changed since the original completion date.
Classifications: 1A✠, SF, E0, OffshoreServiceVessel, Strengthened(DK, HA), DYNPOS(AUTR), NAUT(OC), LFLFuelled, Clean(Design), BWM(T), COMF-V(2), COMF-C(2), BIS, Recyclable, Battery(Power), ER(SCR, Tier III), SPS, Walk2Work

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. In 2022, Ulstein was awarded the Best Industrial Design Company of the Year Award, for, amongst other innovations, the TWIN X-STERN. 

  • Safe and step-less people transfer by 3D motion compensated gangway up to Hs 3.0 metres with excellent winter workability
  • 6t 3D motion-compensated knuckle boom crane for efficient cargo handling
  • State-of-the-art hotel facilities to accommodate 135 persons and ample deck space for cargo storage (940 m2)
     

Milestones

Contract signed: June 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 will enter into a long-term charter with Vestas, supporting offshore wind construction projects in Northwest Europe and contributing to the continued expansion of renewable energy infrastructure in the region.