EnBW has awarded Con4Mare and Germanischer Lloyd Industrial Services a contract for Marine Warranty Survey (MWS) services for its He Dreiht offshore wind farm in Germany.
The offshore wind developer divided the tender, which was issued in July, into three lots to cover wind turbines, foundations, and inter-array grid.
Con4Mare and Germanischer Lloyd Industrial Services will carry out an initial assessment of the procedures and methodology from a Marine Warranty perspective, and provide all personnel, facilities, and services for the performance of the MWS services.
Con4Mare will provide MWS services for the wind turbines and for the foundations.
For the wind turbine works, the on-site MWS monitoring generally begins with loading at the quay edge of the base port and ends at the place of installation at sea, after installation. The base port is defined as the last port from which the components are shipped to the offshore construction site.
The on-site MWS monitoring for the foundation works also begins with loading at the quay edge of the base port and ends with offshore installation.
In the case of foundation MWS monitoring, pre-transportation of the monopiles is not to be checked or accompanied by Con4Mare, while the pre-transport of transition pieces (TPs) from Newcastle to Eemshaven will be covered by the Germany-based company.
The MWS monitoring for TPs begins with the lifting/loading onto the barge in Newcastle, the pre-transport from Newcastle to Eemshaven and unloading from the barge onto the quay edge in Eemshaven as well as the pre-transport of the TPs from the quay edge to the final storage area in Eemshaven and back to the quay edge. The corresponding document checks are also part of this scope.
Germanischer Lloyd Industrial Services will provide MWS services for the inter-array grid.
For the inter-array grid, the MWS work begins with the first lifting of the cable for transport to the offshore location, i.e., with the lifting of the cable in the cable tank of the works and the subsequent loading processes onto the cable-laying vessel (CLV).
The He Dreiht offshore wind farm will be built some 90 kilometres northwest of the island of Borkum and about 110 kilometres west of Heligoland, where 64 Vestas 15 MW wind turbines will be installed.
The project has a grid connection capacity of 900 MW and an excess capacity of 60 MW in order to use the connection capacity as efficiently as possible even when production is lower, according to EnBW, which secured rights to develop the offshore wind farm in April 2017 by placing a zero-subsidy bid in the first competitive tender in Germany.
Offshore construction is expected to start in the first quarter of 2024 with the wind farm scheduled to be fully commissioned by the end of 2025.