The OSS Jasmund project, developed for the German grid operator 50Hertz, has reached a crucial step for the completion of the project, the loading and shipment of its two main parts. These parts are the “deck” or “superstructure” where all the electrical equipment is located and the “jacket” which is the support structure that will be driven into the seabed and on which the superstructure will be installed.
Both pieces weigh approximately 4,500 tons each and are ready for transport to the Baltic Sea, where they will be installed off the island of Rügen. The superstructure, 48 meters long by 33 meters wide and 17.5 meters high, was built by HSM Offshore Energy at its Stormpolder shipyard, and the jacket structure, 72 meters high, was fabricated by Smulders in Vlissingen.
The difficulty and importance of the operation
Moving 4,500-ton structures and placing them on a barge without damaging them requires millimeter planning and special equipment, so a custom support structure was created to allow for optimal load distribution during transfer to the barges, ensuring both structural integrity and efficiency for the maritime transport.
Direct connection to Windanker wind farm
Once operational, the Jasmund substation will allow for the channeling of the energy generated by the Windanker wind farmwind farm located in the northeast of the island of Rügen. With a capacity of 300 MW, the substation will contribute to the electricity supply of approximately 260,000 households, thus strengthening the region’s sustainable energy infrastructure.
The park, currently in the installation phase, will benefit from this platform as a direct connection point to the terrestrial network operated by 50Hertz.
Participants in the construction of OSS Jasmund
The OSS Jasmund project is being developed by the HSI consortium, a group of specialized companies that came together for this complex project:
- HSM Offshore Energy: Built the superstructure.
- Smulders: Source who built the support structure (jacket).
- IV-ONE: Provides engineering and installation expertise.
In addition, the group has an EPCIC (Engineering, Procurement, Construction, Installation and Commissioning) responsibility, i.e. the consortium will be in charge of everything: design, procurement of materials, construction, offshore installation and commissioning. It is a turnkey contract for a gigantic project.
This project is the first of three marine substations that the consortium is delivering to 50Hertz, as part of a strategic plan to strengthen the German electricity transmission grid through renewable sources.
Source: HSM Offshore Energy
