Renewables Obligation Certificates
A ROC is the green certificate issued for eligible renewable electricity generated within the United Kingdom and supplied to customers in the United Kingdom by a licensed supplier. ROCs are issued by Ofgem to accredited renewable generators (or in the case of generating stations subject to a NFFO (non-fossil fuels obligation), Scottish Renewables Obligation or Northern Ireland NFFO contract, to the nominated electricity supplier). It is worth noting that the Scottish Renewables Obligation was superseded by the Renewables Obligation (Scotland) in 2002.
The default is that one ROC is issued for each megawatt-hour (MWh) of eligible renewable output. Some technologies get more, some less. For instance, offshore wind installations receive 2 ROCs per MWh; onshore wind installations receive 1 ROC per MWh and sewage gas-fired plants receive half a ROC per MWh. ROCs are issued into the ROC Register and so are electronic certificates.
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