The GGCS IS system labels electronically each kWh of green gas with a unique identifier known as a Renewable Gas Guarantee of Origin (RGGO), rounded to the nearest kWh. This identifier contains information in code form about:

• the technology by which it was produced (biogas from AD, landfill gas, ‘syngas’ from gasification)
• in the case of biogas, the predominant feedstock from which it was derived (sewage sludge, food, agricultural activities, industrial waste water treatment, municipal solid waste, other feedstocks and a combination of these feedstocks)
• the month and year in which it was produced (MM/YY)
• the country in which it was produced (England, Wales, Scotland, N. Ireland)
• the registered producer
• the kWh number, or sequence or range of kWhs relating to that producer’s green gas.

The RGGO is in the following format (an example):

G     0001     BF     00000001     E     0211

The first part tells you that this is green gas, the next part tells you the identity of the producer, the next part tells you the technology by which the gas was produced, the next part the kWh out of the total injected by that producer in that period, the next part the country in which the producer is located and the final part the month and year in which the gas was injected into the grid.

The relevant technology and feedstock codes in the identifiers are:

BA	Biogas from agricultural activities
BF	Biogas from food waste
BM	Biogas from municipal solid waste
BS	Biogas from domestic waste water treatment
BW	Biogas from industrial waste water treatment
BC	Biogas from a combination of these feedstocks
BX	Biogas from other feedstocks
LG	Landfill Gas
SG	Syngas

The registered producers and their codes are:

0001	JV Energen LLP