Windanker offshore wind farm

Iberdrola has completed the installation of the Windanker offshore wind farm, located in German waters of the Baltic Sea. This is the Group's third wind farm in the Baltic Sea and has an installed capacity of 315 MW.

Windanker has an estimated investment of more than €1 billion and will reach an installed capacity of 315 MW after its commissioning, scheduled for the last quarter of 2026. At the end of 2024, Iberdrola brought the Japanese utility Kansai into this offshore wind project. The Japanese company co-invested in the wind farm, acquiring a 49% stake, while Iberdrola retained control with the remaining 51%.

In addition, the European Investment Bank (EIB) has signed a €500 million green loan with Iberdrola for this offshore wind farm. The transaction is guaranteed by the Spanish export credit agency, Cesce, and is the first case in which a guarantee developed jointly by the EIB and Cesce has been used to support green projects led by Spanish companies outside Spain. The project is also part of TechEU, the EIB Group's programme to accelerate innovation across the EU, which aims to mobilise €250 billion in investment for start-ups, scale-ups and innovative companies across Europe by 2027.

Once operational, the majority of the renewable electricity generated at Windanker will be traded through long-term power purchase agreements (PPAs) on the German market. In total, this offshore wind farm will supply renewable electricity to around 600,000 people per year.

Thanks to the evolution of offshore wind technology and its knowledge of the Baltic Sea, Iberdrola will maximise the efficiency of Windanker, which will incorporate new generation turbines with a unit capacity of approximately 15 MW.

The story behind Windanker's construction

Construction of the Windanker offshore wind farm began after the summer of 2025, with the installation of the first monopile. Installation of the wind turbines was completed in October 2026, and the offshore wind farm is expected to enter operation in the fourth quarter of this year. Spanish company Windar supplied the 21 foundation structures, each measuring up to 84 metres in length and weighing 2,100 tonnes.

Siemens Gamesa built the 21 wind turbines (Siemens Gamesa SG 14-236 DD) that make up the wind farm. They are among the most advanced and powerful in the world, with an output of up to 15 MW each. 

Each wind turbine is also equipped with a revolutionary 236-metre rotor and direct drive technology, which increases reliability and operational performance and also allows annual production to exceed that of previous models by more than 30%. Innovative engineering and construction techniques will be applied throughout the wind farm to ensure maximum efficiency, safety and sustainability.

The transport and installation of the monopile foundations and inter-array cables were carried out by Van Oord, which is also involved in developing the Baltic Eagle offshore wind farm. For this work, the Dutch company deployed its 8,000-tonne heavy-lift vessel, Svanen, which has installed more than 700 foundations across Europe.

Once it enters commercial operation, Windanker will help Germany reduce carbon emissions by around 672,000 tonnes of CO₂ a year and support the country's target of generating 80% of its electricity from renewable sources by 2030. Regulation in Germany is characterised by stability and predictability, creating a framework of confidence for renewable energy developers.

Strengthening the Baltic Hub 

The project strengthens Iberdrola's Baltic Hub in Germany, which will have more than 1,100 MW of installed capacity following combined investment of around €3.5 billion. The Hub is also made up of the Wikinger (350 MW) wind farm, in operation, and Baltic Eagle (476 MW), under construction.

Windanker will also benefit from other synergies during its implementation, as its development coincides with that of the parks in the East Anglia Hub complex in the UK.

Iberdrola, world leader in renewable energies

At Iberdrola, we have been committed to renewable energy for more than two decades, making it a fundamental pillar of our safe, clean and competitive business model. Thanks to this vision, we are now a global leader in renewables, reaching 46,437 MW of clean energy in operation as of the end of the first nine months of 2026.

This commitment is reflected in the €21 billion that our Strategic Plan 2025-2028 allocates to Renewables and Customers, with 38% dedicated to offshore wind, 24% to onshore wind, 10% to solar photovoltaic and another 10% to energy storage.