The primary of 4 120-meter-long offshore vitality assist vessels (OESVs) being inbuilt China for Norwegian offshore providers supplier Sea1 Offshore has been launched on the yard.
Sea1 Offshore positioned the order for the primary two OESVs with Cosco Transport in November 2024, revealing on the time that negotiations have been ongoing for the supply of extra vessels. The contract for the development of two further vessels was introduced in March 2025.
The development of the first vessel, named Sea1 Diamond, started in September 2025, with the second, named Sea1 Citrine, following in December.
Sea1 Offshore reported yesterday, July 21, that Sea1 Diamond was launched on the yard, marking an necessary step ahead within the newbuild program.
Based mostly on the ST-245 design, the OESVs could have a cargo deck of 1,400 sq. meters, and every will probably be outfitted with a 250-ton deck crane, two remotely operated automobile (ROV) hangars, and a moonpool. They’ll present lodging for as much as 120 personnel.
The vessels will probably be methanol-ready, with turbines that may function on 100% biofuel, and will probably be able to serving each the oil & gasoline sector and the renewable vitality market. Kongsberg Maritime will ship complete tools packages.
They’re scheduled for supply throughout 2027 and the primary half of 2028.
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