TwinWatt

About TwinWatt

TwinWatt is a startup from Darmstadt that develops compact vertical wind turbines for roofs, industrial sites and urban locations. The turbine with two counter-rotating rotors and special wind deflector elements achieves a rated output of 12–15 kW, starts at a wind speed of 1.5 m/s and remains exempt from approval below 10 m height. The deflector elements increase the wind speed by a factor of 2.1; the vertical rotor principle enables low-noise operation without shadow flicker and without bird risk. The modular turbine is designed for 24/7 operation, also in combination with photovoltaics, and can be installed on roofs, parking lots or in courtyards. The design, computational engineering and flow-optimization are complete; the first prototype parts were tested in 2025. The core technology was patented in December 2023.

Site

Darmstadt

Processes

Development of compact vertical wind turbines with two rotors and wind deflector elements, Wind deflector elements optionally usable as advertising space, Can be combined with photovoltaics, Wind measurements at pilot customers / field testing

Materials

Flow simulation

Industries

Wind energy, Energy, Commercial/Industrial, Commercial/Industrial (urban and industrial sites)

1. 01

   Engineering and design

2. 02

   Flow simulation (CFD) and computational engineering

3. 03

   Prototype construction and testing

4. 04

   Wind measurements at pilot customers

5. 05

   Field testing and further development

Technology & Development

Site

Darmstadt

DE

Development and prototype construction (c/o Erik Kohler)

Lot size

Prototype

Components & Parts

Inside the production

History & Awards

1. 2023-10

   2nd prize at the TU Darmstadt ideas competition as well as the Merck special prize for sustainability

2. 2023-12

   Patent application for the core technology of the TwinWatt turbine

3. 2024-12

   Hessen Ideen Prize for innovative, sustainable business ideas

4. 2025

   Winner of the Science4Life Energy Cup; RTL television feature in February 2025

5. 2025-05

   INNO-Day Darmstadt: prototype testing, rotor segment exhibited at 1:1 scale

6. 2025-09

   1st place at the Frankfurt School Demo Day