Dreibündenstein: wind measurements completed

Axpo has completed the one-year measurement phase for its planned wind farm project at Dreibündenstein in Graubünden. The 125-metre wind measurement mast will be dismantled over the coming days. Data on wind, weather and bat activity are now being analysed and will inform the next stage of project planning and the assessment of feasibility.

In brief:

• Axpo is dismantling the 125-metre mast following a year of measurements.
• The mast recorded wind, weather and bat activity. Its monitoring system operated independently of a local power supply, using solar panels, small wind turbines and battery storage.
• The data will inform further project planning. Axpo will present the results and next steps to residents of Churwalden and Domleschg at public information events in spring 2027.

The wind measurement mast was erected at Dreibündenstein in October 2025. Over the following year, it recorded wind speed and direction at various heights, along with other meteorological data. Additional surveys of bat activity will help assess the potential impact of a wind farm on local wildlife and identify appropriate mitigation measures.

Next steps

The measurement data will now be considered alongside the findings of ongoing technical and logistical assessments, including potential transport routes and the grid connection. Axpo will use these findings to develop the project plans further. Close collaboration with the municipalities, local partners and residents will remain central to the project’s development.

Axpo is assessing the feasibility of a wind farm at Dreibündenstein with up to eight turbines and a total capacity of around 40 megawatts. If built, the wind farm could generate around 65 gigawatt hours of electricity a year, with around 60 per cent of expected output produced in winter.

On 3 and 4 October 2026, Axpo’s Windmobil, a mobile information vehicle, visited the municipalities of Domleschg and Churwalden to provide an update on the project. Residents were able to find out more and ask questions at stops in Feldis, Paspels, Almens, Churwalden and Malix.

Measurements powered by an autonomous system

The mast used a fully self-sufficient energy system. Solar panels, two small wind turbines and battery storage supplied power to the measurement and communications equipment, allowing Axpo to collect data without a local electricity supply. The system was developed by Axpo subsidiary CKW specifically for the Dreibündenstein project. Both the energy system and the measurement data could be monitored remotely. The technology makes it possible to carry out wind measurements at remote and hard-to-reach sites.