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The WINDEAGLE SaaS solution, backed by nacelle-mounted LiDAR-based IoT sensors provides valuable information and analysis for wind turbine performance diagnostics 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.

A case study is available here


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.

You can find more precise information on Turbulence Intensity herePDF-LOGO


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.

A case study is available here




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.

Discover here why using SCADA Data for optimization is not enough




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






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.


The complete brochure of the WindEagle is available here


About Us

epsiline windeagle 1

Who We Are

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

EPSILINE is a SME company which sells IoT solutions based on laser devices (LiDAR). The company is located in Toulouse, France.

Board :
André ANTOLINI, Chairman of the board

Management :
Christophe LEPAYSAN, Chief Executive Officer

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They have trusted us…

  • Total Eren, Europe & Latin America
  • Valemo, France
  • Eurus Energy, Japan
  • Innergex, France
  • Ningxia Jiaze New Energy, China
  • Boralex, France
  • Renew Power, India
  • Engie Green, France
  • Ventient, Portugal
  • EDF Renewable, France


EPSILINE WindEagle deployments

… and have deployed the solution on 200 wind turbines


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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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