Press releases

Reducing costs for power curve measurements: Site calibration performed with LiDAR

Published: 16/11/2015

Joint press release by Ecofys WTTS, windtest Grevenbroich gmbH and Emergya Wind Technologies B.V.

Utrecht/Lelystad, The Netherlands, 16 November 2015 – For the first time ever, LiDARs were used for a site calibration in preparation of IEC-compliant power curve certification measurements for a wind turbine prototype. Stand-alone LiDARs have been used for years to assess the wind resource for project development. The technology has global recognition within the wind energy industry and the adoption of LiDARs for IEC-compliant power curve measurements is scheduled to be included in the new revision of the IEC 61400-12-1. Normally, a site calibration is executed using two identical met masts. The use of two LiDARs opens up opportunities to reduce project time-line, complexity, and costs, whilst ensuring the integrity and quality of the final deliverable.

The project was executed in preparation of the certification measurements for the new DW61-900 kW wind turbine by Emergya Wind Technologies (EWT), a product which builds on EWT’s market leading position in the distributed wind sector. Ecofys WTTS from the Netherlands, together with its accredited partner windtest grevenbroich GmbH from Germany, conducted the site calibration using two WindCube-V2 LiDARs. The calibration showed that the site is suitable for certification measurements by validating an appropriate measurable sector. The measurement campaign and subsequent LiDAR verification were approved by the certification body.

This project underlines that LiDAR technology has further matured and that LiDARs can deliver data according to IEC quality standards. The project also shows that Ecofys WTTS and windtest grevenbroich GmbH bring innovative and smart solutions to leading and innovative clients.

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About Emergya Wind Technologies

EWT is a global designer and producer of utility standard high performance gearless wind turbines of 250kW to 900kW. Increasingly EWT is also providing energy sales and energy saving solutions to customers in selected jurisdictions, linked primarily to value derived from the kWhs generated by energy savings accrued from the EWT turbine.  With over 500 turbines spinning based on its technology across North America, Europe and Asia, EWT has very much a proven, certified and highly performing product range targeted on the decentralised wind sector, including energy solutions integrating with other sources of generation. (

About windtest grevenbroich gmbh
Since 1996 windtest grevenbroich gmbh (wtg) offers a wide range of accredited services for the renewable energy sector like measurements of power performance, loads, electrical characteristics and acoustic noise as well as wind measurements using towers or remote sensing systems like SoDAR / LiDAR. Furthermore wtg supports wind park developers, banks and insurance agencies with services like site assessment, technical due diligence, noise prognosis, shadow cast prognosis and technical inspections. (

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, Ecofys employs over 200 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, active since 2010. This company was established in order to meet the growing need for wind turbine testing locations. Ecofys WTTS offers full Test Site operation services, wind resource assessments and wind measurements according to all international standards. (

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