In California, at its July 2015 hearing, the California Air Resources Board will consider the re-adoption of the California Low Carbon Fuel Standard (LCFS). Among the staff proposals the Board will be considering is the adoption of an updated version of the California-modified Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (CA-GREET) model. LCFS fuel pathways are grouped into either Tier 1 or Tier 2 under the proposed LCFS regulation. The fuels that fall into these two tiers are described below. Slightly different versions of the model are used to calculate Tier 1 and 2 CIs. The Tier 1 version is called CA-GREET2.0-T1, while the Tier 2 version is called CA-GREET2.0-T2. Since these versions contain the same data tables (they differ only in how CIs are calculated), they are collectively referred to as “CA-GREET 2.0.”
