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Ecofys WTTS and Ammonit team up for enhanced wind measurements

Ecofys WTTS has upgraded its 120m met mast with advanced temperature gradient sensors, bringing LiDAR & SoDAR validation measurements to the next level...


Joint press release by Ecofys WTTS and Ammonit

Ecofys WTTS and Ammonit team up for enhanced wind measurements

Utrecht/Lelystad (Niederlande)/Berlin, 17 March 2015. Ecofys WTTS has upgraded its 120m met mast with advanced temperature gradient sensors, bringing LiDAR & SoDAR validation measurements to the next level. Validation measurements provide insight to the atmospheric stability and can greatly increase certainty in remote sensing wind measurement studies and improve the bankability of future wind energy projects.

In close collaboration with Ammonit Measurements GmbH based in Germany, the met mast was upgraded with six temperature sensors and a 3D sonic anemometer. The aim is to provide advanced insights into the vertical temperature profile, which affects the atmospheric stability of the wind under consideration, and its specific impact on the accuracy of remote sensing devices. Measuring the temperature gradient is also part of the RealMe research project, with funding from the German Ministry of Environment.

LiDAR and SoDAR are Remote Sensing techniques that measure wind speed from a ground based instrument without the need for a measurement mast. For a couple of years Ecofys WTTS has been testing the accuracy of these techniques with its highest purpose-built met mast (120m) at the Ecofys WTTS test site in Lelystad in the Netherlands. To date, around 50 remote sensing machines have been successfully tested using this mast.

Understanding atmospheric stability becomes increasingly important as wind turbines reach greater heights and more complex sites are being considered for wind energy. Having insight into the atmospheric stability can greatly reduce the uncertainty in remote sensing wind measurement studies, thereby improving the bankability of future wind energy projects.

Continuous innovation, collaboration, and knowledge development are key factors for Ammonit and Ecofys WTTS to remain at the forefront of wind measurement technology. By improving measurements of temperature gradients, Ecofys WTTS paves the way towards Remote Sensing classification services, on top of the existing validation and verification services it currently offers to manufacturers and owners.

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Source: Ecofys WTTS

About Ammonit Measurement GmbH
Ammonit offers high quality measurement equipment for the wind and solar industry. As a wind energy pioneer, Ammonit has been playing a leading role in the global wind measurement sector since 1989. Ammonit measurement systems are designed for wind and solar resource assessment, wind farm and solar power plant monitoring, as well as power curve measurement and climate research. The product portfolio includes data loggers, meteorological sensors, SoDAR and LiDAR devices, as well as communication and power supply systems. Additionally, Ammonit developed AmmonitOR, a web platform to monitor measurement campaigns in accordance with the MEASNET guideline. Ammonit cooperates with partners in most countries of the world to provide full service packages for successful measurement campaigns. (

About Ecofys – Experts in Energy
Established in 1984 with the mission of achieving “sustainable energy for everyone”, Ecofys has become the leading expert in renewable energy, energy & carbon efficiency, energy systems & markets as well as energy & climate policy. The unique synergy between those areas of expertise is the key to its success. Ecofys creates smart, effective, practical and sustainable solutions for and with public and corporate clients all over the world. With offices in Belgium, the Netherlands, Germany, the United Kingdom, China and the US, Ecofys employs over 250 experts dedicated to solving energy and climate challenges. (

About Ecofys Wind Turbine Test Services (WTTS)
Ecofys Wind Turbine Testing Services (Ecofys WTTS BV) is a subsidiary of Ecofys Netherlands BV. This company was established in order to meet the growing need for wind turbine testing locations. Ecofys WTTS will offer full certification services for wind turbines according to all international standards. (



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