What is a wind turbine power curve and what does it show?

A power curve shows power output versus wind speed for a wind turbine. Key points: Cut-in speed (minimum wind for generation, typically 3-4 m/s), Rated speed (where rated power is reached, typically 12-14 m/s), and Cut-out speed (shutdown to prevent damage, typically 25 m/s). The curve rises as wind speed cubed until rated power, then remains constant due to pitch control. Power curves are used for energy yield predictions, site assessment, and performance monitoring. Actual power may vary from manufacturer curves due to turbulence, temperature, and air density.