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EN Spec - Standards developed by the European Committee for Standardization

FAME - Fatty Acid Methyl Ester, biodiesel made from multiple feedstock

FFA - Free (or unesterified) fatty acids are components of organic oils, fats and waxes
Esterification - the general name given to the reaction between alcohol and acids in organic chemistry

FOG - Fats, Oils & Greases, a source of feedstock used in the production of biodiesel

RME - Rape Methyl Ester, biodiesel produced from rapeseed feedstock

ROC - A Renewables Obligation Certificate (ROC) is a green certificate issued to an accredited generator for eligible renewable electricity generated within the United Kingdom and supplied to customers within the United Kingdom by a licensed electricity supplier. One ROC is issued for each megawatt hour (MWh) of eligible renewable output generated
Source: Ofgem

SME - Soyabean Methyl Ester, biodiesel produced from soybean feedstock

UCO - Used Cooking Oil, collected from hotels, restaurants and fast food outlets etc.