Wind Turbine Capacity Factor Calculator

Wind Turbine Capacity Factor Calculator

How efficiently is a wind turbine actually performing? This calculator compares real output against the theoretical maximum if it ran at full rated capacity nonstop.

Capacity Factor = (Actual Energy Output / (Rated Capacity x Period Hours)) x 100

Example

3,500 MWh actual output over a year from a 1 MW turbine (8,760 hours):

Theoretical Max = 8,760 MWh → 40.0% capacity factor

Why Capacity Factor Is Never Close to 100%

Unlike a power plant that could theoretically run at full rated capacity continuously given enough fuel, a wind turbine's output is fundamentally limited by variable, intermittent wind speeds at its site - utility-scale wind turbines commonly achieve capacity factors around 35-45% at good sites.

Comparing Sites and Turbine Models

Capacity factor is a key metric for comparing wind resource quality across different sites and evaluating turbine performance over time - a declining capacity factor at the same site over multiple years can signal mechanical issues worth investigating.