As in the question really, I’ve seen both terms thrown about as though they’re equivalent, but I’m not sure if that’s the case?
Best answer by woz
I found the below if it’s any help.
A sort answer isn’t possible but the synopsis is
Renewables Obligation Certificates (ROCs)
ROCs are certificates issued to operators of accredited renewable generating stations for the eligible renewable electricity they generate. Operators can trade ROCs with other parties. ROCs are ultimately used by suppliers to demonstrate that they have met their obligation.
Where suppliers do not present a sufficient number of ROCs to meet their obligation in the reporting period (one year), they must pay an equivalent amount into a buy-out fund. The administration cost of the scheme is recovered from the fund and the rest is distributed back to suppliers in proportion to the number of ROCs they produced in meeting their individual obligation. For more information on ROCs, see Applying for the RO.
About the REGO scheme
What is it?
The Renewable Energy Guarantees of Origin (REGO) scheme provides transparency to consumers about the proportion of electricity that suppliers source from renewable generation.
All EU Member States are required to have such a scheme.
Please note: The Government will ensure that Great Britain and Northern Ireland will continue to issue REGOs and accept Guarantees of Origin (GoOs) from EU member states from 1 January 2021 (i.e. once the implementation period has expired). This will allow electricity suppliers in the UK to continue to use REGOs and EU GoOs to comply with their fuel mix disclosure obligations. We also expect market participants to be able to meet proof of supply requirements in GB whatever the arrangements are following the transition period, including explicit (no-deal arrangements for Continental interconnectors) trading arrangements.
Government has indicated its intention to review this in 2021 so that, longer term, domestic recognition of Guarantees of Origin issued in EU countries will take place only on a reciprocal basis.