Asso.subsea has been awarded the nearshore cable installation scope for three offshore grid connection projects in TenneT’s 2GW Programme: BalWin4, LanWin1 and LanWin5. Located off the northwestern coast of Baltrum Island in northern Germany, the projects represent a new collaboration between Asso.subsea and Jan De Nul, the main contractor, with TenneT as the end client.
Each project involves transporting and installing a cable bundle that includes two high-voltage direct current (HVDC) power cables, one metallic return cable, and one fibre optic cable. Installation is scheduled for 2027 (BalWin4), 2028 (LanWin1) and 2029 (LanWin5). The scope of work includes:
- Cable transpooling from load-out ports in the Netherlands or Germany
- Nearshore installation using the cable-laying vessel Atalanti, modified for the four-cable bundle
- Cable landing via beaching operations with spud cans
- Free-lay in intertidal zones and wet storage of cable ends
