The construction of the first of four offshore energy support vessels (OESVs) that Norwegian offshore services provider Sea1 Offshore ordered from China has officially begun.

Sea1 Offshore placed the order for the first two OESVs with Chinese shipyard Cosco Shipping in November 2024, with the contract for the construction of two additional vessels following this March.

Vessel designer Skipsteknisk announced today, September 16, that a steel-cutting ceremony had marked the start of construction of the very first SEA1 Offshore vessel, named Sea1 Diamond.

Based on the ST-245 design, the OESVs will be 120 meters long, with a cargo deck of 1,400 square meters, and each will be equipped with a 250-ton deck crane and a remotely operated vehicle (ROV) hangar and a moonpool.

The vessels will be methanol-ready, with generators that can operate on 100% biofuel, and will be capable of serving both the oil & gas sector and the renewable energy market. They will provide accommodation for up to 120 personnel.

Kongsberg Maritime will deliver comprehensive equipment packages for the OESVs.

𝐏𝐨𝐰𝐞𝐫 𝐘𝐨𝐮𝐫 𝐁𝐫𝐚𝐧𝐝 𝐖𝐢𝐭𝐡 𝐎𝐟𝐟𝐬𝐡𝐨𝐫𝐞 𝐄𝐧𝐞𝐫𝐠𝐲 ⤵️

𝐓𝐚𝐤𝐞 𝐭𝐡𝐞 𝐬𝐩𝐨𝐭𝐥𝐢𝐠𝐡𝐭 𝐚𝐧𝐝 𝐚𝐧𝐜𝐡𝐨𝐫 𝐲𝐨𝐮𝐫 𝐛𝐫𝐚𝐧𝐝 𝐢𝐧 𝐭𝐡𝐞 𝐡𝐞𝐚𝐫𝐭 𝐨𝐟 𝐭𝐡𝐞 𝐨𝐟𝐟𝐬𝐡𝐨𝐫𝐞 𝐰𝐨𝐫𝐥𝐝!

𝐉𝐨𝐢𝐧 𝐮𝐬 𝐟𝐨𝐫 𝐛𝐢𝐠𝐠𝐞𝐫 𝐢𝐦𝐩𝐚𝐜𝐭 𝐚𝐧𝐝 𝐚𝐦𝐩𝐥𝐢𝐟𝐲 𝐲𝐨𝐮𝐫 𝐩𝐫𝐞𝐬𝐞𝐧𝐜𝐞 𝐢𝐧 𝐭𝐡𝐞 𝐡𝐞𝐚𝐫𝐭 𝐨𝐟 𝐭𝐡𝐞 𝐨𝐟𝐟𝐬𝐡𝐨𝐫𝐞 𝐞𝐧𝐞𝐫𝐠𝐲 𝐜𝐨𝐦𝐦𝐮𝐧𝐢𝐭𝐲!