REGO scheme provides transparency to consumers about the proportion of electricity that suppliers source from renewable generation in Great Britain and Northern Ireland.

The Office of Gas and Electricity Markets (OFGEM) issues one REGO certificate per megawatt-hour (MWh) of eligible renewable output to renewable electricity generators. The reason behind this certificate is to inform the final customer that the produced energy was from renewable sources. 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.