The power coefficient is a dimensionless parameter used to characterize the power requirements of an aircraft or an aerial vehicle during steady-level flight. It represents the ratio of the power required to maintain the aircraft’s flight to the power available from the engine or propulsion system.
CP = Power coefficient P = Power extracted from the wind by the turbine (in Watts) ρ = Air density (in kg/m^3) A = Swept area of the wind turbine blades (in m^2) V = Wind speed (in m/s)