Onshore wind receives 1 Renewables Obligation Certificate (ROC) per MWh and offshore wind receives 1.5 ROCs per MWh.
The predicted nominal value of a ROC in 2010 is estimated to be worth £40.55, dropping to £39.34 in 2015 (based on 2008-09 figures). It should, however, be noted that only about 80 per cent. of this value is likely to be passed to the generators through Power Purchase Agreements.
Onshore and offshore wind will also receive a Levy Exemption Certificate worth £4.70 for each MWh of electricity they generate (based on 2009-10 figures).