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Gearbox Reliability Collaborative Publications

Screenshot of the cover of an NREL report, titled Gearbox Reliability Collaborative Project Report: Findings from Phase 1 and Phase 2 testing.

The NREL wind research program's Gearbox Reliability Collaborative publishes reports and presentations of its activities.




Condition Monitoring

Failure Database


NREL is a leader in the development of international standards related to wind energy applications. NWTC researchers and field testing personnel are members of standards committees for the International Electrotechnical Commission (IEC), the Institute of Electrical and Electronics Engineers (IEEE), Underwriters Laboratory (UL), and the International Measuring Network of Wind Energy Institutes (MEASNET)..

See a list of international standards applicable to wind.

Current design standards specifically applicable to gearbox design and testing include:

  • ANSI/AGMA/AWEA 6006-A03, Standard for Design and Specifications of Gearboxes for Wind Turbines
  • International Electrotechnical Commission. IEC 61400-4: Wind turbines — Part 4: Design Requirements for Wind Turbine Gearboxes.
  • International Organization for Standardization. (1996). ISO-6336-1: Calculation of load capacity of spur and helical gears. Geneva, Switzerland: ISO.
  • International Organization for Standardization. (2005). Wind Turbines — Part 4: Standard for Design and Specification of Gearboxes. ISO/IEC 81400-4:2005. Geneva, Switzerland: ISO, February 2005.