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Renewable Gas Guarantee of Origin (RGGO) Certificates
A guide to RGGOs, how they work and how businesses use green gas certificates to support renewable gas reporting.
A guide to Renewable Gas Guarantee of Origin (RGGO) Certificates
One RGGO is a certificate representing a kilowatt hour of renewable gas injected into the grid, providing evidence of renewable origin for businesses reporting on gas consumption. Green gas shares the same network as fossil gas, so the certificate carries the renewable claim in place of the molecule.
What is a RGGO?
A Renewable Gas Guarantee of Origin (RGGO), also known as a green gas or biomethane certificate, represents one kilowatt -hour of biomethane injected into the gas network. That gas starts as organic waste, agricultural residues or energy crops, broken down through anaerobic digestion and upgraded to meet grid injection standards. Once it reaches the grid, the Green Gas Certification Scheme (GGCS) issues certificates verified against meter readings, recording the producing plant, the feedstock and a greenhouse gas value.
RGGOs provide independent evidence that biomethane has entered the gas network and that its environmental value has been allocated to the certificate holder.
Businesses typically use them to:
Reporting requirements for renewable gas continue to evolve, so it’s important to check that any claims made using RGGOs align with the standards and reporting requirements relevant to your business.
RGGO vs REGO: What's the difference?
Buyers often ask how Renewable Gas Guarantee of Origin certificates (RGGOs) differ from Renewable Energy Guarantees of Origin (REGOs).
Renewable Gas Guarantee of Origin certificates
Renewable Gas Guarantees of Origin are certificates issued for green gas , one per kilowatt hour (kWh) of green gas produced.
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Renewable Energy Guarantees of Origin certificates
Renewable Energy Guarantees of Origin are certificates issued for electricity , one See our RGGO solution per megawatt hour (MWh) of renewable electricity generated.
See our REGO solution-
What RGGOs track:
Renewable gas, typically biomethane, produced and injected into the gas network.
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What REGOs track:
Renewable electricity from wind, solar, hydro or renewable biomass.
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RGGO certificate unit:
1 RGGO = 1 kWh of green gas produced.
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REGO certificate unit
1 REGO = 1 MWh of eligible renewable electricity output.
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Typical RGGO journey
Food or farm waste → anaerobic digestion → biomethane → gas grid → customer allocation.
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Typical REGO journey
Wind or solar generator → electricity grid → supplier or customer fuel-mix disclosure.
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RGGO in use
The certificate is allocated to a gas consumer and cancelled to help prevent double counting.
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REGO in use
The certificate is used by a supplier to evidence the renewable share of the electricity it sells.
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RGGO issuing body
Usually issued through the Green Gas Certification Scheme (GGCS).
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REGO issuing body
Administered by Ofgem.
RGGOs have no set price. Prices move with the renewable gas market, and individual pricing is shaped by supply, demand, and the terms of the contract.
Availability follows the volume of biomethane metered into the grid. A certificate’s value then depends on its feedstock and any attached sustainability documentation.
Demand comes from energy suppliers backing green gas tariffs or qualifying for Green Gas Levy exemption and from corporates evidencing renewable gas use in their reporting, with both drawing on the same pool of supply.
The volume purchased and the duration of the agreement both affect pricing, as does timing, with demand building ahead of reporting deadlines.
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Frequently asked questions
Are RGGOs the same as green gas certificates?
Yes. Renewable Gas Guarantee of Origin is the formal name, and green gas certificates or biomethane certificates are the terms more commonly used in the market. They refer to the same instrument.
What is the Green Gas Certification Scheme?
The GGCS is the UK body responsible for issuing and administering RGGOs. Producers register their injected output, certificates are issued against verified meter readings, and the registry records every transfer until a certificate is cancelled.
What happens when an RGGO is cancelled?
Cancellation retires the certificate against a specific claim. Once cancelled it cannot be transferred or used again, which is what prevents the same renewable gas being claimed by more than one party.
What is the difference between an RGGO and a Proof of Sustainability?
An RGGO verifies that green gas was produced and injected into the grid. A Proof of Sustainability (PoS) verifies that the biomethane meets sustainability and greenhouse gas criteria under a voluntary certification scheme. Producers can link the two, recording a PoS reference against the certificate.