Bluestream Offshore Awarded Contract for Retrofit Installation of Corrosion Protection System on SylWin Alpha Offshore Converter Station
Bluestream Offshore, a subsidiary of OEG Energy, has secured a significant contract from transmission system operator TenneT for the retrofit installation of a corrosion protection system on the SylWin alpha offshore converter station for the SylWin1 offshore grid connection in Germany.
The project involves the subsea installation of an Impressed Current Cathodic Protection (ICCP) system to replace the existing faulty system. The scope of work includes decommissioning outdated cables and debris causing system interference, pre-survey using a remotely operated vehicle (ROV)-mounted multibeam sonar, and visual inspections to assess the work area’s condition and identify any obstructions.
Installation Process
Bluestream will route and secure subsea cables through the J-tube, install and connect three ICCP buoy-mounted anodes, and ensure proper positioning around the jacket structure. Concrete mattresses will be laid to protect and stabilize the cables, followed by commissioning, functional testing, and an as-left survey to verify operational integrity.
The entire operation will be carried out from a DP-2 dive support vessel (DSV) equipped with a walk-to-work system. The offshore crew, consisting of divers, ROV pilots, and supervisors, will work around the clock to ensure smooth installation. The vessel will also be equipped with a full diving equipment spread and an ROV with cameras, multibeam imaging sonar, and a manipulator skid for precision tasks, along with a dedicated rigging workshop.
SylWin1 Offshore Grid Connection
TenneT commissioned SylWin1 in April 2015, making it the longest offshore grid connection globally. The project connects three offshore wind farms – Sandbank, DanTysk, and Butendiek – located 70 kilometers off the coast of Sylt to the mainland. These wind farms have a combined capacity of 864 MW and play a crucial role in Germany’s renewable energy transition.