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 Guidance Documents

    The GGCS publishes a range of guidance documents for its memebers on both operational and policy issues...

    Posted: 29 June, 2022

  • 2021 Annual Report Released

    We are pleased to publish our annual report covering the activity of the Scheme in 2021 (available here) Landmarks and achievements during the year include; 10 TWh of RGGOs retired since the GGCS was established GGCS became an Approved Certification Scheme within the Green Gas Levy (GGL). ERGaR Certificate of Origin Scheme was launched with GGCS as a founding member Fifteen new trader accounts were opened during the year bringing the total to over 80. Please contact the Scheme Director, Jesse Scharf, with any questions or queries - jscharf@greengas.org...

    Posted: 8 June, 2022