What ratings does SWCC publish for small and medium wind turbines?

For small turbines, AWEA Standard 9.1-2009 defines the following ratings except for Peak Power, which SWCC has added:

AWEA Rated Annual Energy is the calculated total energy that would be produced during a one-year period with an average wind speed of 5 m/s (11.2 mph)

AWEA Rated Sound Level is the sound pressure level (dBA) not exceeded by the wind turbine 95% of the time at a distance of 60 meters from the rotor with an average wind speed of 5 m/s (11.2 mph).

AWEA Rated Power is the wind turbine’s power output at 11 m/s (24.6 mph).

Peak Power is the highest point on the certified power curve.

For medium wind turbines, SWCC has defined the following ratings:

Reference Annual Energy is the calculated total energy that would be produced during a one-year period with an average wind speed of 5 m/s (11.2 mph).

Reference Sound Pressure Level is the sound pressure level (dBA) not exceeded by the wind turbine 95% of the time at a distance of 60 meters from the rotor with an average wind speed of 5 m/s (11.2 mph).

Reference Power is the highest point on the certified power curve at or below 11 m/s (24.6 mph). Manufacturers may still describe or name their wind turbine models using a nominal power (e.g. 50 kW E-3120).

Peak Power is the highest point on the certified power curve.

The small and medium wind ratings are similar but are not identical. For example, AWEA Rated Power is the power output at 11 m/s, but for medium wind, Reference Power is the highest point on the certified power curve at or below 11 m/s. Peak Power, Rated Power and Reference Power are illustrated below.

The medium wind ratings were developed with global harmonization in mind. AWEA Standard 9.1-2009 is currently being revised, and a draft of the new edition has been released for public comment.   The syntax and definitions of the small and medium ratings are expected to align once the standard is finalized.

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