Assembly of Germany's largest floating PV system on “Cottbuser Ostsee” begins

Current water depth of around 1.50 m enables floating installation

LEAG and project developer EP New Energies are starting installation work on Germany's largest floating solar plant on the lake ‘Cottbuser Ostsee’. The 29 MWpeak plant on the country's largest post-mining lake to date is scheduled to go into operation in winter 2024/2025 and generate around 29,000 MWh of electricity per year. This is enough electricity to cover the annual consumption of around 8,250 households. The positive flooding progress in the last winter half-year has caused the water depth to rise to around 1.50 metres at the planned location in the ‘Cottbuser Ostsee’. This means that the plant can be built using the floating construction method.

"The floating PV plant on the ‘Cottbuser Ostsee’, one of our flagship projects within the LEAG GigawattFactory, is nearing completion. After intensive planning and the installation of the dolphins last year, we are now seeing the realisation of this innovative project, which will have an impact beyond the borders of Lusatia," said LEAG CEO Thorsten Kramer. "With this project, the transformation of LEAG and the region into a green powerhouse is receiving a further boost towards a sustainable future in which energy supply security and climate protection are guaranteed in equal measure."

Over 51,000 solar modules will be mounted on around 1,800 floating bodies, known as solar boats, over the coming months. These will be attached to 34 dolphins built into the lake bed. The pre-assembly of the solar modules on the solar boats will take place directly on the shore of the lake. The assembled solar boats are then transported by boat to their designated positions on the lake. The plant's technical equipment includes 88 inverters, eight transformer stations and two medium-voltage systems.

"I am looking forward to the realisation of Germany's largest floating PV system. The original concept envisaged erecting the system on the dry lake bed and allowing it to float as the open-cast mining lake flooded. Due to the heavy rainfall at the end of last year, the lake flooded much faster than predicted, so we had to change our concept to a floating installation. As project developers, we are used to reacting quickly to new situations in order to make projects a success," says Dominique Guillou, Managing Director of EPNE.

The current water depth of approx. 1.50 metres allows the system components to be installed safely. Even if the water recedes seasonally, it would still be possible for the system components to float in. The company Pfalzsolar has been commissioned to install the system.

At 16 hectares, the turbine area will account for less than one per cent of the lake's surface area and is therefore in line with the lake's tourist usage objectives.


Further information can be found at and


Your contact for further information:

Kathi Gerstner, LEAG, Press Officer Phone 0355 2887 3010,

Margarita Schulz, EPNE, Team Lead Communications Phone 030 767584572,


Video animation of the future floating PV plant


„Ich freue mich auf die Umsetzung von Deutschlands größter schwimmenden PV-Anlage. Das ursprüngliche Konzept sah vor, die Anlage auf dem trockenen Seeboden zu errichten und mit der Flutung des Tagebausees aufschwimmen zu lassen. Durch die starken Regenfälle Ende letzten Jahres wurde der See deutlich schneller geflutet als prognostiziert, sodass wir unser Konzept auf eine schwimmende Installation umstellen mussten. Als Projektentwickler sind wir es gewohnt, schnell auf neue Situationen zu reagieren, um Projekte zum Erfolg zu führen“ so Dominique Guillou, Geschäftsführer der EPNE.

Die derzeitige Wassertiefe von ca. 1,50 Metern ermöglicht eine sichere Installation der Anlagenteile. Selbst bei einem saisonalen Wasserrückgang wäre das Einschwimmen der Anlagenteile weiterhin möglich. Mit der Errichtung der Anlage ist das Unternehmen Pfalzsolar beauftragt worden.

Die Anlagenfläche wir mit 16 Hektar weniger als ein Prozent der Seefläche ausmachen und steht damit im Einklang mit den touristischen Nutzungszielen des Sees.

Weitere Information finden Sie auf und


Ihre Ansprechpartnerinnen für weitere Informationen:

Kathi Gerstner, LEAG, Pressesprecherin Telefon 0355 2887 3010,

Margarita Schulz, EPNE, Team Lead Communications Telefon 030 767584572,


Video-Animation zur künftigen Floating-PV-Anlage