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Data are not available on the operational hours of onshore and offshore wind turbines and therefore it is not possible to estimate the time that the turbines were not in operation in the last 12 months. Provisional estimates of load factors for onshore and offshore wind in 2011 are 27.4% and 36.7% respectively.
The Government's main mechanism for incentivising large-scale renewable electricity is the renewables obligation (RO) which provides support for eligible generation. Generators receive renewables obligation certificates (ROCs) for every megawatt hour (MWh) of eligible renewable electricity they generate. Less efficient turbines will therefore receive a lower level of support.