A Renewable Energy Guarantee of Origin (REGO) is the energy attribute certificate used in the UK. Each REGO certifies that 1 megawatt-hour (MWh) of electricity was produced from a renewable source in Great Britain or Northern Ireland and is issued by Ofgem, the UK energy regulator.
Each REGO represents 1 MWh of electricity generated from a verified renewable source. It records the technology (wind, solar, hydro, biomass, anaerobic digestion), the generating station, the output period, and the station's capacity. UK electricity suppliers use REGOs to evidence the renewable content of the electricity they sell, which they are required to declare in their annual Fuel Mix Disclosure (FMD).
REGOs are issued by Ofgem, the regulator of the gas and electricity markets in Great Britain. Generators apply for accreditation through Ofgem's Renewables and CHP Register, after which a REGO is issued for every 1 MWh of renewable output exported to the grid.
The REGO scheme was originally aligned with the EU guarantee of origin framework. After the UK left the European Union and withdrew from the Association of Issuing Bodies (AIB) in 2021, REGOs and GoOs are no longer interchangeable. A REGO cannot be cancelled in a European GoO registry, and a GoO cannot be used to satisfy UK Fuel Mix Disclosure requirements. For utilities active on both sides of the Channel, this means maintaining separate workflows, separate registries, and separate reporting cycles.
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Renewable Energy Guarantee of Origin
