Work out turbine annual energy production instantly with clear inputs, formula shown and shareable results.
Annual energy production is rated power x 8760 hours x capacity factor, then reduced by turbine availability and electrical losses in cables and transformers. Full-load hours — net energy divided by rated power — is the standard comparison figure, typically 2200-3500 hours onshore and 3500-4800 offshore.
Annual energy production
AEP = rated power x 8760 x capacity factor x availability x (1 - electrical losses)
From convolving the site's wind speed distribution with the turbine power curve, then applying wake, blade soiling, icing and curtailment losses. A bankable estimate needs at least a year of on-site measurement.
A larger rotor on the same generator raises capacity factor at low wind speeds, producing more energy and steadier output even though rated power is unchanged. That is why specific power ratings have fallen steadily.