Germany’s largest offshore wind farm under construction, EnBW’s He Dreiht, just hit a big milestone: The first enormous turbine is now up in the North Sea.

He Dreiht – which means “it spins” in Low German – is using Vestas’s massive 15 megawatt (MW) turbines, the first project in the world to install them. Just one spin of one of the rotors can generate enough electricity to power four households for an entire day.

When it’s finished, He Dreiht will have 64 mega turbines cranking out 960 megawatts (MW) of clean power – enough to supply around 1.1 million homes. And it’s being built without any government subsidies.

EnBW, one of Germany’s major energy companies, has been working in offshore wind for more than 15 years, but He Dreiht is their biggest project yet. “It will play a key role in helping us to significantly grow our renewable energy output from 6.6 GW to over 10 GW by 2030,” said Michael Class, who heads up EnBW’s generation portfolio development.

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The project is a win for Vestas, too. “With the installation of the first V236-15.0 MW, we have reached an important milestone for both the He Dreiht project and our offshore ramp-up, which helps Germany build a more secure, affordable, and sustainable energy system,” said Nils de Baar, president of Vestas Northern & Central Europe.

He Dreiht is located about 85 kilometers (53 miles) northwest of Borkum and 110 kilometers (68 miles) west of Helgoland. At peak times, more than 500 workers will be out at sea building the farm, using a fleet of more than 60 ships. EnBW’s offshore team in Hamburg is running the show.

The installation process is a major operation. The 64 foundations were already set in the seabed last year. Parts for the turbines are loaded onto the installation vessel Wind Orca in Esbjerg, Denmark, and shipped out in a 12-hour journey to the construction site. From there, the turbines are lifted into place. Meanwhile, crews are also working on internal wind farm cabling.

A partner consortium made up of Allianz Capital Partners, AIP, and Norges Bank Investment Management owns 49.9% of the shares in He Dreiht.

Read more: Trump admin halts $5 billion NY offshore wind project mid-build

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