Requirements for wind turbines with a rotor swept area of more than 200 m2 and less than 1000 m2

Prior to applying to the Interstate Turbine Advisory Council (ITAC) for consideration for the ITAC list of wind turbines and, for those turbines already listed, to remain in good standing with ITAC, turbine manufacturers must be able to demonstrate that their turbine meets the following requirements. See "Maintaining Good Standing" guidance document.

Technical Requirements

1.  Medium wind turbines must comply with BOTH 1A and 1B below:

1A. Carry up to date power performance and acoustic third party test reports as per IEC61400-12-1 and IEC61400-11. The test reports must be certified by an accredited certification body*.  Separate test reports must be submitted for turbines which have undergone changes affecting power performance or acoustics by more than ten percent from original model.  Variant turbine applications must be accompanied by a letter from a certification body stating that changes to not constitute more than a 10 percent performance change.

1B. The manufacturer must show evidence of either A OR B:

A. Submit a certified Design Evaluation according to IEC 61400-1 (2005 or future version) by an accredited certification body.  In cases where several variations of a turbine system are available, a full design evaluation shall be performed on a representative configuration/series of wind turbines of common design and manufacture.  ITAC shall determine whether the submitted design evaluation applies to variant turbines.  This decision will be based on a review of materials, components, manufacturing processes, and system modifications of the variant turbines compared to the original turbine system.

B. Evidence of extensive operational history (all of the requirements below):

1. At least 500,000 hours of fleet operation.  Fleet is defined as a single turbine product model; ITAC will consider variations of that turbine model within an overall turbine model line on a case-by-case basis.

2. At least 25 operating wind turbines.  All these turbines should be of the same product model.

3. At least 2 years of operation from 5 wind turbines.  All these turbines should be of the same product model.

Non-Technical Requirements

1.  The turbine, tower and all major components must offer a 2-year parts warranty. If the turbine manufacturer warranty does not cover the tower or all major components, the manufacturers of these items must also offer a 2-year parts warranty.

2.  Marketing material must not be misleading. Specifically, the technical specifications, power and energy production information listed on marketing materials, including websites, must be consistent with the third party test reports.

3. Manufacturers must be able to document that they have taken appropriate action to correct chronic technical problems with the turbine reported by customers, dealers, or other third parties that have resulted in: nuisance acoustic emissions above those documented through testing and certification; intermittent operation under normal operating conditions; early component wear or failure under normal operating conditions and maintenance.  Appropriate action includes development of an engineering response plan and documentation of how the problem was addressed in the manufacturing line and for turbines experiencing problems in the field.

4. Manufacturers must be able to document that they have taken appropriate action to respond to all catastrophic failures of the turbine. Appropriate action includes: rapid communication to all affected parties about any potential safety concerns; completion of a full failure analysis, preferably with the involvement of a third-party, within six months of the failure; identification the point(s) of failure; development of an engineering response plan that includes both manufacturing modifications and field repair strategy for installed turbines; follow-up communication to all affected parties about the resolution.

5. Manufacturers must resolve customer or contractor complaints, informally or formally.

*Examples of accredited certification bodies include the Small Wind Certification Council, Intertek, TUV NEL, and GL Garrad Hassan.  If you are an accredited certification body and would like to be listed here, please send us an email. 

Download the Application Form

ITAC Application Form (Word) (May 2013)
ITAC Application Form (PDF) (May 2013)

(May 2013)