How much of the time do wind turbines produce electricity?
A modern wind turbine produces electricity 70-85% of the time. It generates different outputs dependent on wind speed. Over the course of a year, a small wind turbine in the UK will generate about 20% to 30% of the amount it would generate in a constant strong wind. This is known as its 'load factor' (or 'capacity factor'). The turbine itself has usually at least 97% mechanical availability and generates with 95% mechanical to electrical efficiency, so the limited output is overwhelmingly associated with lack of wind The load factor of conventional UK thermal power stations is on average 50%, and the mechanical to electrical efficiency is between 30% and 50% depending on the type of plant.
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