The region at which the turbine starts producing power. Below this speed, it is not worthwhile, nor efficient, to turn the turbine on is called as?

The Power Curve of wind turbine:

• The diagram below shows the power output of a turbine against steady wind speeds.
• The cut-in speed (typically between 6 and 9 mph) is when the blades start rotating and generating power.
• As wind speeds increase, more electricity is generated until it reaches a limit, known as the rated speed.
• This is the point that the turbine produces its maximum, or rated power.
• As the wind speed continues to increase, the power generated by the turbine remains constant until it eventually hits a cut-out speed (varies by turbine) and shuts down to prevent unnecessary strain on the rotor.

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Cut-in speed: A turbine's cut-in and cut-out speed (also called 'cut-off' speed) are determined by the manufacturer to protect the turbine from damage. The cut-in speed is simple; it's the point at which the turbine starts generating electricity from turning.

Cut-off speed: The cut-off point is more important though, and denotes how fast the turbine can go before wind speeds get so fast that it risks damage from further operation.