Mont-Soleil: BKW launches test phase for solar power plant
Energy
Mont-Soleil: BKW starts test phase for solar power plant
12 June 2025
How can solar power production and agriculture be effectively combined at over 1,200 metres? On Mont-Soleil, BKW, together with research partners, is launching a unique pilot project designed to show how photovoltaics and grazing animals can coexist – with scientific support, initiated voluntarily and with a view to a sustainable energy future.
The existing solar power plant on Mont-Soleil is to be expanded. The Bernese Jura Governor’s Office granted planning permission in mid-March 2025. The project is now moving into the next phase with a test installation. In an area at more than 1,200 metres above sea level, scientifically sound principles specific to the project will be examined in greater depth to determine how solar installations can be designed so that they interfere as little as possible with agricultural use – for example by grazing animals – and ideally even enable new synergies.
Two test tables, two research objectives
The first PV test table will be installed in the lower section of the planned site. In parallel, a second test is taking place in the upper section of the existing installation, operated in collaboration with the Bern University of Applied Sciences BFH PV Lab in Burgdorf. The aim: to test various solar modules on a so-called PV bench for their performance under the special climatic conditions of the Jura Arc – with a particular focus on winter electricity yield. The measurements are carried out using highly precise technology.
The second, equally central part of the project is taking place in close collaboration with HAFL Zollikofen (School of Agricultural, Forest and Food Sciences). Here, testing is being carried out under real-life conditions to determine how the PV structures affect plant growth, the microclimate and the behaviour of cows. The scientific collaboration with HAFL is not required by law, but is initiated and supported voluntarily and proactively by BKW. In doing so, BKW underlines its conviction that the energy transition must take place in dialogue with the environment and society.
No building permit procedure required
BKW reported the test infrastructure to the relevant authorities on time and, due to its temporary nature, does not require a building permit. The test duration is limited to a maximum of two years. Extensive ecological assessments of flora and fauna were already carried out prior to the submission of the building application and described in detail in an environmental impact report. A further detailed survey of biodiversity is planned as part of the definitive construction phase and during operation through monitoring.
