Offshore pumped storage concept successfully tested

Today, a 3 m diameter hollow concrete sphere has been recovered from the bottom of lake Constance where it had been operated in a 4 week test in a deph of around 100 m. The energy storage and release feature of this novel storage concept could be demonstrated sucessfully, so the principle is now proven experimentally. Currently, the test results are being evaluated to inform and validate the computer models developed by IWES.

Design of the Energiewende

We support industry and politics in all systemic, technical and economical questions concerning the transformation of energy systems.

Products and know-how

With our products and expertise we support industrial and political, national and international customers and have been doing so for decades.

Testing and Validating

We posess a wide range of test and experimental facilities, laboratories and technical equipment.

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Technology or Economy?

This is no question for us. We design solutions for technical and economical problems arising from the transformation of power supply systems.

Electricity – Heat – Transport

The climate protection aims can only be achieved when the transformation of the energy system is cross-sectorally designed and power supply structures are rethought.

Wind, solar, bioenergy or water?

We work on the system integration of all renewables. Our specific focus being on security of supply and grid stability.


Prof. Dr. Clemens Hoffmann | Director


Our service portfolio deals with current and future challenges faced by the energy industry and energy system technology issues.

We explore and develop solutions for sustainably transforming renewable based energy systems.

Business Area

Energy Economics

Business Area

Energy System Technology




New solution to optimization problems of demand response

The deployment of demand response in private households poses complex issues in terms of fulfilling both restrictions of the grid and flexibility constraints of the households. Researchers at Fraunhofer IWES have developed stochastic optimizations based on probabilistic forecasts, which consider these restrictions.



Tackling remaining cost drivers in wind energy

Scientists at Fraunhofer IWES in Kassel aim to contribute to further cost reductions in wind energy use. They will present results of an large scale expert survey on future cost reduction potential at the Wind Europe Summit 2016 in Hamburg, the world's largest wind energy event.



Better Forecasting For Solar And Wind Power Generation

The sun does not shine and the wind does not blow with constant intensity. This is a problem for the power grid, where the power supply must always match the power demand. In the EWeLiNE project, Fraunhofer and the German Weather Service have been working to develop better models for forecasting the generation of renewable electricity. Now they have launched a platform for transmission system operators to test the new models live.



Start-up of new online Wind Energy Systems Masters programme

The University of Kassel and the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES) have started a joint international Masters study programme "Online M.Sc. Wind Energy Systems". The course content is offered entirely online and in English.



IAA 2015: HIL battery simulator and e-mobility inductive power transmission system

At the International Trade Fair for Mobility which opened yesterday, the Kassel branch of Fraunhofer IWES presented two of their products within the framework of “Fraunhofer System Research for Electromobility “. The two products are a hardware-in-the-loop battery simulation system and an inductive power transmission system for electric vehicles.