The Green Gas Certification Scheme

The Green Gas Certification Scheme (GGCS) issues, transfers and retires Renewable Gas Guarantees of Origin (RGGOs) within our registry.

RGGOs are issued to green gas producers for units of green gas injected into the gas grid, which displace units of fossil gas. They can then be transferred between a variety of counterparties before being retired and allocated to gas consumers. The GGCS ensures that only one RGGO is issued for each unit injected, that they are transferred securely, and only ever allocated to one consumer. By doing so we provide certainty that green gases are not double counted.

The GGCS is run by Renewable Energy Assurance Ltd who carry out a range of certification and consumer protection activities all of which promote renewable energy and the circular economy. Renewable Energy Assurance Ltd is a company limited by guarantee (number 05720606) and is a wholly-owned subsidiary of The Association for Renewable Energy and Clean Technology, a not-for-profit company limited by guarantee (number 04241430).

Benefits of the Green Gas Certification Scheme

The GGCS is a simple and reliable way for green gas producers to capture the value of their product while guarding against double-counting. It provides an instrument for consumers to show they are using green gas, enabling companies and households to support biomethane production in the UK and, where applicable, lower their reported carbon emissions.

Taking part in the Green Gas Certification Scheme

Producers may open accounts in the GGCS registry where they will be issued RGGOs and can transfer them to trading accounts. Gas Suppliers, Gas Shippers and other interested parties, including consumers, can open trading accounts in the GGCS registry where they can receive RGGOs from producers, send and receive RGGOs from other traders, and allocate them to gas consumers at which point they are retired. Those with an interest in green gas can join as Associate Members without opening an account in the registry.

Renewable Gas Guarantees of Origin (RGGOs)

A RGGO is issued when a kWh of green gas is injected into the grid. Each RGGO contains information about where, when, and how that kWh of green gas was produced. RGGOs allocated to consumers are retired and listed on Retirement Statements which can be verified here.

Latest News:

  • GGCS April 2022 Market Update now available

    Our April 2022 Market Update is now available (you can download the PDF file below)...

    Posted: 18 May, 2022

  • GGCS calls for the renewables commitments to be met after supplier collapses

    GGCS pushes for renewables commitments to be considered in Supplier of Last Resort process. With over 1,000,000 households being impacted by the collapse of their energy supplier, GGCS has written to Ofgem to propose that renewable gas commitments are considered within the Supplier of Last Resort (SLOR) process. Consumers join renewable tariffs on the promise that a percentage of their gas will be matched to Renewable Gas Guarantees of Origin (RGGOs) and/or a percentage of their electricity consumption will be matched to Renewable Electricity Guarantees of Origin (REGOs)...

    Posted: 2 February, 2022