Subsea substation

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Value proposition

A current challenge to increase the cost efficiency of the offshore wind industry is the capex and operational cost of the electrical distribution system including offshore substations.

A clear alternative to a traditional topside is to locate the substation subsea: it can be placed near the wind farm in deep waters enabling significant cost reductions, it does not affect negatively coastal communities or activities in the area, and it does not present challenge with dynamic high voltage cables.

Present technology status is TRL6-7 for 200MVA at 132kV / 33kV. To close the gap for 400MVA+ at 220kV / 66kV which is at TRL4 today, connector technology upgrades are required.

ABB has supplied more than 35 subsea transformers since the late 1990's and no failures has been reported.