Siem Offshore Contractors
Baltic 2 Offshore Wind Farm
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Baltic 2 OWF

33kV Inner Array Grid Cable System

Siem Offshore Contractors was awarded the contract for the turnkey engineering, procurement, installation and commissioning (EPIC) works related to the inner array grid cable system of the Baltic II Offshore Wind Farm (OWF) project by EnBW Baltic 2.

The OWF is situated approx. 30 km north of the island of Rügen within the German sector of the Baltic Sea. The OWF consists of 80 wind turbine generators, each with a capacity of 3.6 MW and is based on an inner array grid of 86 medium voltage copper core submarine composite cables with a total length of up to 86km.

The submarine composite cables were manufactured and supplied by Draka Norge on behalf of the client and were subsequently installed by Siem Offshore Contractors utilising dedicated in-house resources such as the AHTS Siem Garnet.

Facts & Figures
  • 80 Wind Turbine Generators

  • 86 km of submarine cables

  • 1 Offshore Substation (OSS)

  • 2,145 W2W Connections

  • 288 MW installed capacity

  • 10,057 Personnel Transfers

SOC worked with EnBW to overcome many challenges including difficult seabed conditions and a compressed installation window.”

Jonathan Linton
Project Manager

A combination of pre-trenching, jet trenching and gravel placement was applied and optimized in close cooperation with EnBW.  SOC was also able to maintain non-stop cable laying operations over the winter, even in snowy and sub-zero conditions to avoid any project delays.  SOC was complemented in its flexible and solution-oriented approach through the project contributing to it success

Specifications
Client: EnBW Baltic 2, Germany
Location: Baltic Sea, German Sector
Water Depth: Up to 44 m
Scope: Marine cable route survey
Pre-lay boulder clearance
Pre-lay trenching (by ploughing)
Pre-lay grapnel run and route clearance
Cable installation, termination, testing and pre-commissioning
Type of Cables: 3-core submarine composite cable
Voltage Level: 33 kV
Conductor: Copper
No. of Cables: 86
Length of Cables: 90 km
WTG’s: 80 x 3.6 MW, Siemens Wind Power
Total Capacity: 288 MW
Schedule: One (1) continuous campaign in 2014 and 2015
Vessels: MV Siem Garnet
MV Siem Topaz
MV Olympic Commander
MV Island Crown
MV Glomar Wave
W2W Connections: 2,145
Personnel Transfers: 10,057

Website: ENBW

Further information: 4C Offshore

Want to know more?
Lets have a chat!
Lars Muck
Business Area Manager
+49(0)491-91243-0
lars.muck@siemoffshore.com