Definitions of availability terms for the wind industry

This white paper offers a framework for understanding and comparing various forms of availability reporting.

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Wind farm availability terms differ widely with the intended use; whenever an availability figure is referenced, it should be carefully defined. Any definition of availability must clarify the scope of analysis, and a prioritized list of states. This white paper offers a framework for understanding and comparing various forms of availability reporting.

This updated version includes comparisons of the DNV and IEC definitions following the IEC 4 level categorization method, with an optional 5th level to allow head-to-head definition comparisons. We have also explained our availability audit programs and how they apply to operators and turbine manufacturers, and how the turbine manufacturer audits are used in our reliability analysis program.

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