The primary control range should be ±2% of the nominal power but higher values, up to ±5%, should be achievable. The primary frequency control reserves shall be activated within 30 seconds and maintained for at least 15 minutes. The secondary control range should be at least ±10% of the nominal power and should be activated with a minimal speed of 1%/min. Higher ramping rates shall be achieved, with a maximum speed of 5%/min.