STAWAG Energie GmbH has begun commissioning the Nieder-Schleidern wind farm near Korbach in the German state of Hesse, with full grid feed-in expected by the end of May 2026.

The three-turbine installation carries a total installed capacity of 16.8 megawatts and is projected to generate approximately 40 million kilowatt-hours of electricity annually, a volume the company says is equivalent to the yearly power consumption of just under 11,500 households.

Three Vestas Turbines on a Steep Hillside Site

Each of the three wind turbines at Nieder-Schleidern is a Vestas V162 model rated at 5.6 megawatts, bringing the combined capacity of the park to 16.8 megawatts.

The machines feature a rotor diameter of 162 meters and a hub height of 148 meters, resulting in a total structure height of around 230 meters per turbine. Once fully operational at the end of May, the turbines will feed electricity into the grid on a permanent basis.

Construction at the site began in July 2025 and presented significant logistical challenges from the outset. The access road leading to the wind farm has a gradient of more than 20 percent, which required the deployment of additional traction vehicles to haul the large structural components up the slope.

The rotor blades were transported using a self-propelled modular transporter, commonly referred to in the industry as an SPMT. The total investment in the project amounts to approximately 34 million euros.

Expanding a Portfolio of More Than 25 Wind Farms Nationwide

Dirk Gottschalk, managing director of STAWAG Energie GmbH, described the new wind farm as part of a broader and already extensive generation portfolio. Speaking about the commissioning, Gottschalk said the company currently operates more than 25 wind farms across Germany, encompassing around 100 individual wind turbines in total.

Together, those existing installations generate over 600 million kilowatt-hours of electricity each year, which Gottschalk said is sufficient to supply more than 170,000 households with self-generated green power on a calculated basis.

STAWAG Energie is a wholly owned subsidiary of STAWAG – Stadt- und Städteregionswerke Aachen AG, the municipal utility serving the city of Aachen and the surrounding urban region.

The company positions its wind power portfolio as evidence of its standing as one of the most active municipal players in Germany in the expansion of renewable energy.

Strategic Investment in Renewables

Gottschalk framed the Nieder-Schleidern project explicitly within the company's long-term strategic direction. "With the Nieder-Schleidern wind farm, we are commissioning another high-performance project and are thereby consistently implementing our strategy: we are investing specifically in renewable energies in order to combine security of supply with climate protection," he said. "The expansion of wind energy is for us a central lever for actively shaping the energy transition."

The commissioning of the Hesse site adds 40 million kilowatt-hours per year to STAWAG Energie's total renewable generation output. The company stated that the park will begin delivering power to the grid permanently once the full commissioning process concludes at the end of May 2026.

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