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Iberdrola’s Baltic Eagle wind farm project will be connected to the German main grid following the signing of a deal for the construction of a substation.

The deal was signed with 50Hertz for the construction, installation and commissioning of the offshore substation (OSS) for Baltic Eagle wind farm being developed in German waters of the Baltic Sea. The offshore substation will collect the electricity generated by the offshore wind farm and connect to the onshore transmission grid in Lubmin.

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The substation will be made up of a foundation and a topside housing the transformers as well as electrical equipment. The four-legged steel jacket foundation will weigh approximately 2,900 tonnes and will be fastened with two hammered piles at each leg. The topside consists of a closed multi-story module of five decks with a total estimated net weight of around 4,250 tonnes.

Iberdrola has further awarded contracts to the joint venture Iemants-Fabricom, responsible for the manufacturing of all structural elements of the substation, and to marine contractor Heerema, who will transport and install the substation on the Baltic Eagle site. Siemens Gas and Power is responsible for the delivery of all main electrical equipment for Iberdrola`s low-voltage part of the OSS.

Fabrication is already progressing at different locations in Europe and platform manufacturing has already started at Belgian yards. Sail out to the site is planned for 2022, while completion of the offshore installation and commissioning is expected to take place in 2023.

When the Baltic Eagle wind farm is connected to the grid, the wind turbines will deliver electricity via the 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.

The substation is one of the key elements of the windfarm, tasked with collecting and exporting all electricity produced by 50 wind turbines –estimated to account for ca. 1.9TWh per year. With this energy production it will be possible to sustainably meet the demand of 460,000 homes and to avoid the emission of 800,000 tonnes of CO2 into the atmosphere each year.

The Baltic Eagle offshore wind farm is located northeast of the RĂ¼gen island off the Pomeranian coast in the Baltic Sea in a water depth of 40-45 meters. Iberdrola was awarded 476MW of capacity during the transitional auction held in 2018.

The wind farm will comprise 50 wind turbines of 9.525MW capacity to be installed on monopile foundations and will cover an area of 40 km2. Commissioning is expected in 2024.