About Green Gas Certificates

Understanding the information contained on a Green Gas Certificate

A Green Gas Certificate contains a range of information. The table below can help you understand the different fields and the information they provide.

Date Created: The date that the Renewable Gas Guarantees of Origin (RGGOs) were retired from the GGCS system and the Certificate created
Date Printed: The date that the Certificate was downloaded from the GGCS system
Certificate issued to: The identity of the gas consumer who now owns the retired RGGOs
Renewable Gas Guarantees of Origin: The unique identifiers that represent kWhs of biomethane injected into the grid. Each Certificate holds a specific range of retired RGGOs and you will see here the first and last kWh of that range
Injection Date: Gas is registered with the GGCS in quarterly consignments and this tells you the month in which the quarter ended. For example if the RGGOs on the Certificate represent gas injected between April 2016 and July 2016, then July 2016 will show in this field
Technology/Feedstock: See below for more information on the technology/feedstock information displayed on a Certificate  
Injection Location: Either England, Wales, Scotland or Northern Ireland
Amount: The amount of kWhs of biomethane injected into the grid, that the RGGOs on the Certificate represent
Certificate Pin Number: Can be used here to validate a Certificate
Green Gas Producer: The details of the producer of the biomethane, whose gas injections the RGGOs listed on the Certificate relate to. More information on producers is available here
Green Gas Supplier: The details of the supplier who has sold the RGGOs listed on this Certificate to the named gas consumer
Further information: This text contains information on the carbon emissions associated with the biomethane production process and the nature of the support the UK government has provided via the Renewable Heat Incentive – for more information see here


More about Renewable Gas Guarantees of Origin (RGGOs)

The GGCS system creates a unique identifier known as a Renewable Gas Guarantee of Origin (RGGO) for each kWh (rounded to the nearest whole number) of biomethane injected into the grid and registered with the Scheme.

These RGGOs are traded by GGCS suppliers, then sold to gas consumers and retired from the GGCS system.

Each unique identifier contains information in code form which links to much of the information displayed on a Green Gas Certificate.  An example of a unique identifier is

G     0001     BF     00000001     E     0211

The various aspects of the code are detailed below.

G     Indicates that the gas was “green”
0001 Indicates the identity of the producer – see the producer information page for more information
BF Indicates the technology and feedstock by which the gas was produced
00000001 Indicates which kWh the RGGO represents, out of the total kWhs injected in a quarterly consignment.
Indicates the country in which the producer is located (England, Wales, Scotland or Northern Ireland)
0211 Indicates the month and year in which the gas injection quarter ended   


More about technology/ feedstock identifiers

RGGOs created between December 2012 and September 2017 have a technology/feedstock identifier determined by the predominant feedstock that the producer was using. These are:

BABiogas from agricultural activities
BFBiogas from food waste
BSBiogas from domestic waste water treatment
BCBiogas from a combination of these feedstocks

To align the GGCS more closely with the way producers submit information to Ofgem under the Renewable Heat Incentive, RGGOs created from October 2017 onwards have been given a technology/feedstock identifier based on the fuel classification of the feedstocks used. These are:

MPBiomethane from products/co-products
MRBiomethane from residues
MWBiomethane from wastes

For more information on the process of allocating technology/feedstock identifiers based on the fuel classification of the feedstocks please see here.

As new types of green gas such as bio-SNG and low carbon and renewable hydrogen begin to enter the market we will create new technology/feedstock identifiers.

Founder partners:
British Gas
Thames Water
Milton Keynes Council
National Grid
Bio Group
CNG Services Ltd