<p>Renewable obligation certificates (ROCs) are issued to accredited generators by Ofgem on the basis of their reported renewable generation. Information on the number of ROCs issued to all accredited stations is published in the ROC register. This is available on Ofgem's website at:</p><p>https://www.renewablesandchp.ofgem.gov.uk/</p><p>It is not always clear from the register, however, who owns which generation assets, so the information requested could be provided only at disproportionate cost.</p><p>An estimate of the value of support for each generating station can be calculated by multiplying the number of ROCs issued by the value of the ROC. The nominal value of a ROC in any given year is equal to the buyout price (the amount a supplier must pay for every ROC they do not present to Ofgem in order to comply with their obligation) plus the recycle value (the amount re-distributed to suppliers from the buyout and late payment funds on a pro-rata basis depending on how many ROCs they presented to Ofgem) for that year. This information can be found in Ofgem's annual reports which are available on their website at:</p><p>https://www.ofgem.gov.uk/environmental-programmes/renewables-obligation-ro</p><p>The nominal value represents the maximum worth of a ROC to a generator but is not necessarily the amount paid by a supplier.</p>