DONG promotes onshore pre-terminating of array cables

Technique offers time and cost savings

Significant savings are achievable from moving certain offshore cabling tasks to an onshore location, DONG Energy's Tue Keller said yesterday.

Keller outlined the advantages of onshore pre-terminating of inter-array cables, at Windpower Monthly's offshore cable installation, engineering and maintenance conference. This involves 'finishing' cables onshore, for rapid connection at the project site.

Using a 45-turbine project in the Borkum area of the German North Sea, located 240km offshore in water depths of 29-31m as an example, Keller said cost savings of DKK45m (€5.9m) "plus spin-offs" could be achieved. The cost reduction would be achieved from onshore pre-termination of the project's 38 inter-array cables.

Moreover, the time saved could amount to as much as a month, allowing for earlier energisation and revenue-raising generation, he added.

"The concept is flexible" and equally applicable to projects based on monopile foundations or jackets, he said. The technique also reduces a project's health and safety risks and offshore crew requirements.

DONG has a team dedicated to developing cost-saving techniques for offshore wind projects and has announced a target of €100/MWh by 2020.

* In other news, DONG confirmed earlier this week that construction of the 400MW Anholt offshore wind farm has reached the half-way mark.

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