Epsiline WindEagle

The unique All-in-one solution for independent

Wind Turbine Monitoring and Optimization


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The nacelle-mounted wind LiDAR WINDEAGLE provides valuable information that enables multiple types of analysis of wind turbine performance and optimization:


1. Static yaw misalignment detection :


60% of wind turbines are misaligned, some with a yaw up to 15°. This leads to a sharp drop in performance. EPSILINE WindEagle provides accurate and reliable measures of wind direction directly in front of the blades where it is relevant.

With EPSILINE WindEagle, wind farms operators can accurately correct the yaw and can lead to 10% gain in performance.


2. Turbulence Intensity in different wind sectors


Thanks to its short range measurement in front of the wind turbine blades, the EPSILINE WindEagle is the unique lidar which is able to measure precisely Turbulence Intensity for each wind turbine.

The wind farm operator can thus check and optimize its curtailment strategy.


Turbulence Intensity data are the most important data in Wind turbine life extension estimations by reducing uncertainty in these estimations.


3. Aerodynamic and mass imbalance


25% of wind turbines suffer from rotor imbalance, up to 2°. Rotor imbalance reduces the aerodynamic efficiency of the wind turbine and can lead to reduced asset life due to excessive loads. EPSILINE WindEagle detects aerodynamic and mass imbalance.

Correcting rotor imbalance improves the lifespan of major wind turbine components and can lead to 4% gain in performance.


4. Performance analysis using Relative Power Curves


  • Power Curve analysis to compare performance before and after improvements on the wind turbine e.g. yaw or pitch modifications, blade extensions, upgrades, retrofitting, etc
  • Power Curve for Long term monitoring of performance and evolution over time.


5. Free-stream equivalent Power Curve. Comparable with site assessment data or power curve verification.


6. Gust detection

Thanks to its 2s wind speed measurements, the lidar-based sensor suite is able to detect rapid changes in wind speed or gusts.




The traditional measuring instruments on a wind turbine (anemometer and wind vain) are used to control the wind turbine. In particular, the wind vain allows the wind turbines to rotate and follow the wind direction. 

However these measurements, down wind from the blades are subjected to turbulence and will be inherently erroneous, despite sophisticated software to correct them. Consequently wind turbines will not be perfectly aligned with the oncoming wind direction, causing Yaw misalignment, lost performance and additional stress loads on the wind turbine.

The solution is to install on the top of the nacelle roof a LiDAR (laser anemometer) and measure in front of the blades. Consequently the Lidar provides precise and continuous measurements of wind speed and direction.


About Us

nacelle mounted wind lidar EPSILINE

Who We Are

EPSILINE is a SME company which develops wind measurement solutions based on laser systems (LIDAR) and serves the wind energy industry. The company is located in Toulouse, France.

nacelle mounted wind lidar EPSILINE

Our Mission & Vision

EPSILINE is an innovative company offering ‘state-of-the-art’ technologic solutions to the global wind industry, keeping a fine balance between high-end technology and the economic reality of wind farms.

Become the leading global supplier of intelligent wind measurement systems for the wind industry.


  • Institut Optique Graduate School Logo
  • LAAS CNRS logo
  • INP Logo
nacelle mounted wind lidar EPSILINE

Our Values

  • Innovation
  • Sustainability
  • Excellence
  • Integrity
  • Teamwork
  • Mentorship



André ANTOLINI, Chairman of the board

Christophe LEPAYSAN, Chief Executive Officer


juil 2nd, 2020 Installation of the new sensor WindEagle

EPSILINE installed its new device WindEagle early this week.

Yaw misalignment, Turbulence Intensity, Rotor Imbalance

Yaw misalignment, Turbulence Intensity, Rotor Imbalance

This unique all-in-one product for wind farm operators includes a lidar, a weather probe (PTU), as well as magnetometer, accelerometer &  gyroscope sensors.

With the online portal, the operator can have a real-time 360 view of what is happening on the wind turbine.

juin 2nd, 2020 First deployment after covid19 lockdown

EPSILINE has deployed the first lidar after covid19 lockdown. The unit has been installed in the east of France on 27 May on a GE 2.75-120 wind turbine.

nov 25th, 2019 1st EPSILINE LiDAR in China

EPSILINE has delivered its first lidar in China ; it was successfully installed on a Goldwind 2MW Wind Turbine of Baquan WindFarm, which is owned by Ningxia Jiaze Renewables. With its plug and play design, its installation was performed within half a day.


118, Route d’Espagne, F-31100 Toulouse, France
Tel : +33 5 32 10 83 50

Canada Distributor

X Wind Services Inc.
Adress: 1020 rue Bouvier, 4ième étage, Québec, QC, Canada, G2K 0K9
Phone : +1 418 558 6977

China Distributor

Shanghai ShangYi Industrial Trading
Phone : +86 13917819317

Korea Distributor

Antevista Korea Co, Ltd.
Adress: Hangang POS Ville 1117, Yangpyung-ro 67, Yeongdeungpogu, Seoul, Korea
Phone : +82 2 2298 2628


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