The Renewable Energy Guarantees of Origin (REGO) scheme provides transparency to consumers about the proportion of electricity that suppliers source from renewable generation in Great Britain and Northern Ireland.

Ofgem issues one REGO certificate per megawatt hour (MWh) of eligible renewable output to generators of renewable electricity.

The purpose of the certificate is to prove to the final customer that a given share of energy was produced from renewable sources. As such, the primary use of REGOs in Great Britain and Northern Ireland is for fuel mix disclosure (FMD). FMD requires licensed electricity suppliers to disclose to potential and existing customers the mix of fuels (coal, gas, nuclear, renewable and other) used to generate the electricity supplied.

Renewable generators of any size in Great Britain and Northern Ireland can apply for the scheme.