The Fraunhofer Institute for Applied Polymer Research (IAP), in collaboration with the BBF group, has developed an ultralight wind turbine specifically designed to operate in areas with low wind speed.
The first five prototypes have already been delivered and are being installed in different strategic locations. The goal: democratize access to clean, efficient, and adaptable energy for urban, rural, or emergency contexts.
One of the main limitations of conventional micro wind turbines is their high start-up speed: many do not start rotating until they exceed 4 m/s.
In contrast, the new models from Fraunhofer IAP start operating at 2.7 m/s. This allows their installation in areas previously discarded due to lack of constant wind, such as residential, peri-urban, or agricultural zones in inland Europe.
Optimized performance and innovative structural design
The new wind turbine reaches up to 450 RPM and generates a power of 2,500 W at 10 m/s, representing 83 % more than similar systems available on the market. Its energy efficiency of 53 % approaches the theoretical Betz limit (59 %), converting more than half of the wind’s kinetic energy into useful electricity, something exceptional in turbines of this size.
“Compact, ultralight, and efficient turbines allow truly autonomous generation. This development demonstrates how decentralized solutions can be integrated even in urban environments,” highlighted Raúl Comesaña M., director of BBF.
The advancement goes beyond aerodynamic redesign. The rotor blades, made of hollow core composite materials without foam, reduce the total weight by 35 %, improving start-up with gentle winds, structural safety, and ease of assembly.
Advanced manufacturing and adaptive wind response
Production is based on large-format 3D printing (up to 2×2 meters), custom molds, and an automated fiber placement system (Automated Fibre Placement). This approach ensures millimeter precision, reduces waste, and enhances the energy efficiency of the process.
Furthermore, a special lamination has been developed that allows the blades to deform in a controlled manner during intense gusts, turning out of the stream to avoid overloads. This eliminates the need for electronic brakes or complex mechanical systems, simplifying maintenance and extending the equipment’s lifespan.
This is the innovative ultralight wind turbine.
Mobile, rural, and humanitarian applications
Thanks to their compact and lightweight design, these turbines can be transported and installed without heavy machinery, making them an ideal solution for:
- Emergency camps and humanitarian aid
- Seasonal agricultural facilities
- Sustainable outdoor events
- Rural self-consumption without grid connection
- Public buildings with hybrid systems (solar + wind)
- Peak consumption relief in homes and SMEs
Towards a circular economy in renewable energies
The team is working on a key evolution: the development of monomaterial components, that is, parts made with a single type of polymer, easier to recycle and with a lower environmental footprint. This step is essential to progress towards a real circular economy in the energy sector.
