Iberdrola installs offshore substation for 476MW Baltic Eagle windfarm

Substation will collect electricity generated by turbines and transform supply voltage before feeding it into onshore grid

Spanish energy giant Iberdrola has announced that Baltic Eagle’s offshore substation topside has been successfully installed.

The operation involved lifting a total estimated net weight of around 4,200 tonnes and was executed by Heerema Marine Contractors using the Thialf installation vessel.

The substation consists of a foundation and a topside housing the transformers, as well as electrical equipment. Its four-legged steel jacket foundation weighs approximately 2,900 tonnes and is fastened with two hammered piles at each leg.

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Iberdrola will now start the offshore phase to make the offshore substation (OSS) ready to be energised, after which the monopiles will be installed and the wind turbines attached with transition pieces.

Following turbine installation, the wind farm is set to be commissioned in 2024.

The Baltic Eagle offshore wind farm is located northeast of the Rügen island off the Pomeranian coast.

With its 50 wind turbines of 9.5MW capacity each, it will have a capacity of 476MW.

Baltic Eagle transmission

Once the wind farm is connected to the grid, the electricity from the wind turbines will be delivered via inter-array cables to the offshore substation where it is then transformed from 66kV to 220kV and transmitted via two high voltage subsea cables across the 90km distance to the landing point at Lubmin into the 50Hertz transmission grid.

The 220kV submarine cables were already laid in 2021 and 2022 and deposited on the seabed.

The next step will be to move the two cable ends into the transformer platform in the second quarter of this year.

Iemants-Fabricom was responsible for the manufacturing of all structural elements of the substation, the marine contractor Heerema for transportation and installation, and Siemens Gas and Power for the delivery of all main electrical equipment for Iberdrola’s low voltage part of the OSS.

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