Press Releases

Heat pumps provide efficient and climate-friendly heating also in existing buildings. This is the conclusion of a research project by the Fraunhofer Institute for Solar Energy Systems ISE. Over four years, researchers conducted detailed measurements on 77 heat pumps in single-family to three-family homes. The result: the heat pumps achieved seasonal performance factors ranging from 2.6 to 5.4. The CO2 emissions of the heat pumps, calculated for the first time considering time-variable factors, were 64 percent lower in 2024 compared to those of natural gas heating systems. The research team also conducted long-term sound measurements and investigated how photovoltaic systems can be integrated into heat pump operation. In addition to Fraunhofer ISE, two energy suppliers and nine heat pump manufacturers participated in the project.

Deutsche Bahn is the largest electricity consumer in Germany, operating its own power grid of nearly 8,000 kilometers in length. The project "PV4Rail" examined how this grid can be utilized for the feed-in of solar power. The consortium lead by Fraunhofer ISE developed and tested an inverter for the direct feed-in of photovoltaic power, analyzed the photovoltaic potential along the tracks, and conducted techno-economic studies of railway power PV systems. These could become an important component of the energy transition if regulatory and market disadvantages were addressed.

Prof. Hans-Martin Henning was honored yesterday with a scientific symposium to mark his retirement. The director of the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg also shaped the Fraunhofer Society's energy research for many years. As chairman of the Expert Council for Climate Issues, he advised the German government on the implementation of the Climate Protection Act from 2020 to 2025 and, in this role, was a vocal advocate for consistent measures.

The transition of the heavy-duty and commercial vehicle sector to zero-emission engines is driving the expected production volume of fuel cells. At the same time, electrolysis is gaining importance as a building block for a low-emission energy economy. New production methods are needed to ramp up the market for both technologies. In this context, Fraunhofer ISE has established a versatile platform for research on the production of membrane electrode assemblies to support component manufacturers as well as machinery and plant engineers in addressing production challenges associated with fuel cells and electrolyzers. The focus is on innovative, continuous processes that enable high throughput rates and cost reductions, such as roll-to-roll manufacturing. Furthermore, pro-duction research considers the entire value chain from catalyst powder to 7-layer MEA, including quality control.

An international research team of photovoltaics scientists has taken a crucial step toward the industrialization of perovskite silicon tandem solar cells. They demonstrated that passivation of the perovskite top cell is possible in combination with textured silicon bottom cells featuring large pyramid size, which are the current industry standard for solar cells. Additionally, they discovered that the passivation affects the entire perovskite layer – unlike silicon, where surface treatment only influences the upper layers – leading to further efficiency improvements. The PV researchers from King Abdullah University of Science and Technology (KAUST), University of Freiburg and Fraunhofer Institute for Solar Energy Systems ISE presented their technological and scientific innovations for the passivation of perovskite top cells in the journal Science.

In addition to expanding renewable energy generation, a successful energy transition requires stable system operation at all times. To achieve this, renewable energies and storage power plants will have to take on extensive system services and essential grid-forming properties in the future. In the “GFM Benchmark” project, Fraunhofer ISE developed a test procedure for grid-forming inverters on behalf of the four German transmission system operators and applied it to devices from various manufacturers. On the one hand, the project provided a comprehensive overview of the market readiness of grid-forming inverters. On the other hand, the project results provide an important practical check for new national and European testing standards.

The groundbreaking ceremony on July 22, 2025 marked the start of construction for the Engineering Center for Sustainability (Ingenieurzentrum Nachhaltigkeit – IZN) on Freiburg’s airport campus. The new building will foster closer collaboration between Freiburg’s five Fraunhofer institutes and the University of Freiburg under the umbrella of the Department of Sustainable Systems Engineering (INATECH).

In the first half of 2025, Germany and many other European countries generated more solar power than ever before. This was offset by lower electricity generation from wind energy. As a result, the share of renewable electricity in Germany's net public electricity generation was 60.9 percent, down from 65.1 percent in the first half of 2024. Within the European Union, public electricity generation from solar and wind fell from 358.1 terawatt hours (TWh) in the first half of 2024 to 344.4 TWh in the first half of 2025. This is according to the half-yearly data on public net electricity generation presented today by the Fraunhofer Institute for Solar Energy Systems ISE. The evaluation is based on the data platform energy-charts.info.

Around the world, there is a lack of comprehensive medical care for people living in remote areas. Researchers at the Fraunhofer Institute for Solar Energy Systems ISE and the Fraunhofer Institute for Surface Engineering and Thin Films IST have devised a solution for this in the PreCare project: a flexible, modular health platform with solar power supply that can be installed on the bed of a pickup truck. It is already in use in South Africa and Namibia. The team was presented with the Innovations for a Better Future award from the Fraunhofer-Zukunftsstiftung (Fraunhofer Future Foundation) for this development.

The Port of Rotterdam and the Fraunhofer Institute for Solar Energy Systems ISE are working with Australian partners to investigate opportunities for Western Australia to become a world-class producer, user and exporter of renewable hydrogen. Western Australia could provide for a substantial portion of the European demand for hydrogen in 2050. The TrHyHub Study, a collaboration between key stakeholders in Australia, Germany, and the Netherlands, analyzed the critical components that could deliver a supply chain from the Mid West Hydrogen Hub in Oakajee to Germany via the Port of Rotterdam. In the short term, ammonia is the most suitable option, with substantial cost savings to be anticipated in the future.